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JM PVC & TPO (Thermoplastic) Commercial Roofing Application
Guide
Table of Contents
Section One Roof Insulation Application Guide . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . 1-1 Roof Insulation
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . 1-4 Roof Insulation Fastening Patterns . . . . . . .
. . . . . . . . . . . . . . . . . . . . . 1-12
Section Two Section 2A PVC Membrane Application Guide . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . 2-1 Hybrid PVC
Membrane with Redundant Bituminous Ply Systems Application Guide .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34
PVC/TPO RhinoPlate System Application Guide . . . . . . . . . . . .
. . . . . .2-46 Section 2B PVC General Product Specifications . . .
. . . . . . . . . . . . . . . . . . . . . . . . .2-50 PVC Fully
Adhered Specifications . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . .2-52 PVC Hybrid Specifications . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . 2-56 PVC
Mechanically Fastened Specifications . . . . . . . . . . . . . . .
. . . . . 2-72 PVC RhinoPlate Systems Specifications . . . . . . .
. . . . . . . . . . . . . . . . . 2-76
Section 2C PVC Mechanically Fastened Fastening Patterns . . . .
. . . . . . . . . . . . .2-80
Section 2D PVC Flashing Details . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .2-89 Vapor
Barrier Flashing Details . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . .2-181
Section Three Section 3A TPO Membrane Application Guide . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 PVC/TPO
RhinoPlate System Application Guide . . . . . . . . . . . . . . . .
. .3-33
Section 3B TPO General Product Specifications . . . . . . . . .
. . . . . . . . . . . . . . . . . . .3-36 TPO Fully Adhered
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . .3-38 TPO Mechanically Fastened Specifications . . . . . . .
. . . . . . . . . . . . . 3-74 TPO RhinoPlate Systems
Specifications . . . . . . . . . . . . . . . . . . . . . . . .
3-98
Section 3C TPO Mechanically Fastened Fastening Patterns . . . .
. . . . . . . . . . . .3-102
Section 3D TPO Flashing Details . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . .3-113 Vapor
Barrier Flashing Details . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . .3-207
717 17th StreetDenver, CO 80202(800)
922-5922www.jm.com/roong
MechanicallyFastened
Fully Adhered Hot Air Weld MechanicallyFastened
Fully Adhered Hot Air Weld
Book 3: PVC and TPO
Book 3: PVC and TPO
Book 3: PVC and TPO
RS-8350-PVC/TPO 5-15 (Replaces 3-14)
COMMERCIAL ROOFING APPLICATION GUIDE
RS-8350-PVC-TPO
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Section One:Roof Insulation Application
Roof Insulation Application
ONESECTION1Roof Insulation
Application Guide, Specifications, and Fastening Patterns
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1-1RS-7386 11-13 (Replaces 2-13)
Roof Insulations Application
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1.0 Product Information
Effective roof insulation helps lower overall energy
consumption, reduces HVAC equipment requirements, and brings about
improved comfort for the occupants of a building .
JM provides these benefits with a full line of high performance
insulations and cover for single ply, built-up, metal and modified
bitumen roofs . The section that follows reviews the storage,
installation and use instructions for the cover board and
insulation board product lines . JM product line . Prior to product
selection, it is recommended that the product performance, design
and installation concepts of the roofing system be considered to
ensure the correct product selection .
The Fesco product line incorporates recycled cellulose and has
been third-party certified for recycled content by UL Environment .
With an average recycled content of 27% to 40%, this product line
can provide LEED points (certified products) in certain jobs . The
JM polyisocyanurate product line has product comprised of a
closed-cell polyisocyanurate foam core bonded in the manufacturing
process to various facers (glass-reinforced, paper, coated glass
and aluminum foil) . Finally, the Invinsa product line includes
high-density polyisocyanurate cover boards that are lightweight
with high compressive strength . These boards provide improved hail
resistance and foot traffic resistance .
2.0 Guarantees
It is also important to protect a roofing system with a
guarantee of performance . JM offers a wide variety of Peak
Advantage Guarantees, including many 20-year No-Dollar-Limit (NDL)
specifications which are available from NDL Approved Contractors
only . Check with a JM Technical Services Specialist for the names
of approved NDL Contractors in your area and details on NDL
guarantees including extended term guarantees .
3.0 Product Considerations
3.1 Insulation Characteristics Roof insulation performs two
basic functions in any roof system . It is the primary thermal
barrier for the top surface of the building envelope, and it serves
as a base for the roofing system . In order to perform these two
functions successfully, any roof insulation should have the
following characteristics: Sufficient thermal resistance (R Value)
to meet the designers needs . Resistance to indentation,
compression and crushing during installation of the roof
membrane and during periodic maintenance, once the roof is
completed . Cover boards are always recommended by JM .
Rigidity to support the roof membrane and to span the rib
openings of metal roof decks . Resistance to moisture absorption .
Dimensional stability . Compatibility with common roofing systems
and attachment techniques . Resistance to wind uplift, and
pull-through of mechanical fasteners . Acceptability by
Underwriters Laboratories Inc ., FM Global and code agencies .
4.0 Design Considerations
4.1 Drainage Proper drainage must be provided on all roof
systems . Standing or ponded water hastens the deterioration of any
roof system since the water can work its way through laps or any
minor application flaw in the membrane .
4.2 Double Insulation Layers Installing roof insulation in
multiple layers provides the designer with improved thermal
performance . It also contributes to the overall perfor-mance of
the roof system for the following reasons: Recent studies indicate
that as much as 8% of the thermal efficiency of the insulation
can be lost through the insulation joints and exposed insulation
fasteners of single layer installations . Insulation joints that
are staggered in multiple layer installations block the flow of
heat .
Roof InsulationApplication Guide
1Roof InsulationApplication Guide, Specifications, and Fastening
Patterns
Section One:Roof Insulation Application
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1-2 1-3RS-7386 11-13 (Replaces 2-13) RS-7386 11-13 (Replaces
2-13)
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6.0 Foam Thermal Values6.1 Thermal Values The thermal values of
all closed cell urethane or isocyanurate foam insulations are at
their optimum at the time of manufacture . As these products age,
some thermal loss occurs due to air infiltrating the foam cells and
diluting the insulating gas in the cells . This process continues
to occur over time . The degree to which this occurs is a function
of the product formula and quality . It may vary from one
manufacturer to another . The ultimate R-value of foam products
will also depend on individual installation circumstances .
6.2 Long Term Thermal Resistance (LTTR) Johns Manville
manufactures polyisocyanurate foam insulation products and reports
R-Value in accordance with ASTM C 1289-12 and CAN/ULC S704 . LTTR
is a test procedure for a foam insulation with blowing agents other
than air, giving a Thermal Resistance value in a 15 year
time-weighted average . This method provides a more accurate method
to report long term thermal performance for foam plastic insulation
materials .
7.0 Definition of Terms and Symbols7.1 k-Value (Thermal
Conductivity): the measurement of heat flow in BTUs through a 1 (25
mm) thickness of any single homogeneous material, per hour per sq .
ft . per degree F temperature difference (W/m C) .
7.2 C-Value (Thermal Conductance): the measurement of heat flow
in BTUs per hour per sq . ft . per degree F temperature difference
through any single material, regardless of thickness (W/m2 C) .
7.3 R-Value (Thermal Resistance): the measurement of the
resistance to heat flow . The reciprocal of the C-value .
7.4 U-Value (Overall Heat Transfer Coefficient): the
measurement, in BTUs of heat flow, per hour per sq . ft . per
degree F temperature difference through a combination of materials
such as roof deck, vapor barrier, roof insulation, built-up
roofing, and the air films below and above such combinations .
Roof InsulationApplication Guide
Roof InsulationApplication Guide
Multiple layer insulation installation reduces the stress
accumulation of a thick, single insulation joint and distributes
the stress more evenly over the multiple, thinner insulation joints
.
The bottom side of the membrane is protected from physical
damage from insulation plates and fasteners by the second layer of
insulation .
Roof decks are stiffened .
5.0 Insulation Installation Considerations
5.1 Protection from Weather JM Roof Insulations (polyiso,
Invinsa, and Fesco) are shipped with plastic shrouds that are
intended to temporarily protect the insulation while in transit .
Polyiso packaging from some JM plants is considered tarpless;
meaning it can be shipped without covering the load with a
tarpaulin . JM plants without tarpless packaging ship polyiso with
loads covered by a tarpaulin . Please contact your technical
representative to learn which JM factories use tarpless packaging
.
All JM insulation products (no matter how shipped), that are
stored outdoors, must be stored in accordance with Johns Manville,
NRCA (National Roofing Contractors Association) and PIMA
(Polyisocyanurate Insulation Manufacturing Association) best
roofing practices using a weatherproof covering such as a tarpaulin
. In humid climates, JM recommends slitting the plastic shrink wrap
(or removing the packaging all together), prior to covering the
pallet with a breathable tarpaulin, to allow for venting .
Furthermore, JM insulation should not be stored in or around
standing water . JM recommends 3 to 4 of dunnage below individual
pallets of insulation to keep it off the ground .
Insulation should not be left exposed to weather . No more
insulation should be installed than can be completely covered with
membrane on the same day . Factory packaging should not be relied
upon as protection from the weather .
5.2 Asphalt Temperatures JM endorses the guidelines established
by the NRCA and ARMA for heating asphalt for proper insulation
applications . Asphalt should be applied at the Equiviscous
Temperature (EVT), 25F (14C) .
5.3 Cold Weather Application Hot asphalt chills rapidly at 40F
(4C) . To avoid problems associated with cold asphalt application,
insulation should be applied with mechanical fasteners or the mop
and flop method of installing insulation . The mop and flop method
entails mopping the back of the insulation so that the asphalt
retains its adhesive qualities for a longer period . When applying
insulation with hot asphalt, board size should not exceed 4 x 4 (1
.22 m x 1 .22 m) . Care should be taken in any application below
40F (4C) .
5.4 Mechanical Application to Steel Decks Mechanical attachment
of insulation to steel decks is the only acceptable attachment
method . For current information regarding Factory Mutual
requirements over insulated steel decks, please check with a JM
Technical Services Specialist, or the current FM ApprovalsSM
RoofNav .
5.5 Cold Adhesive Application JM insulations may be installed in
Insulation Adhesives: MBR Bonding Adhesive One-Step Foamable
Adhesive Roofing Systems Urethane Adhesive
5.6 Foam Insulation Products are Combustible They should be
properly protected from exposure to fire during storage, transit
and application .
5.7 Limitations When installed over metal decks, spans shall be
limited for specific deck gauges as outlined in the current FM
Global Loss Prevention Data Sheets 1-28, 1-29 and FM ApprovalsSM
RoofNav . JM insulations are not recommended for applications where
temperatures are outside the service temperatures of -100F to 250F
(-73C to 121C) . Although JM roof insulations are designed to be
compatible with most membranes, the membrane manufacturer should be
consulted for specific approval with individual membrane products
.
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1-4 1-5RS-7387 11-13 (Replaces 11-12)RS-7387 11-13 (Replaces
11-12)
Type of Deck Attachment Recommendation
Wood Board 1, 2, 7*
Plywood 1, 2, 7*
Gypsum 3, 5*
Gypsum 3*
Concrete 4, 6
Concrete 6
Concrete 5*
Cementitious Wood Fiber 3
Steel 1, 2
* See mechanical fastener recommendation Section 1 .5, Roof
Decks in the current Commercial Roofing Product Manual .
UltraFast metal plates should not be used on SPM systems .
UltraFastFastener and Metal Plate
Roof Insulation
Steel Roof Deck
1
UltraFastFastener and Plastic Plate
Roof Insulation
Steel Roof Deck
2
Polymer Auger Fastener with Plate
Roof Insulation
Cementitious Wood Fiber or Gypsum Roof Deck
3
Note: See pages 3-9 through 3-17 for Roof Insulation Board
Fastening Placement Patterns .
Roof Insulation SpecificationsRecommendations for
AttachingInsulation to a Structural Deck
Insulation SpecificationsThe JM Insulation Specification
numbering system is designed to allow the designer to easily and
clearly describe a particular insulation construction . Arabic
numerals denote the number of layers of insulation attached in a
particular manner . Capital letters indicate the method of
attachment of the insulation and the presence of a vapor retarder
.
Capital letters indicate the following:M = Mechanically Fastened
V = Vapor RetarderA = Adhered (Hot Asphalt) C = Cold AdhesiveL =
Loose Laid (Cold Applied & Urethane Adhesive)
MechanicallyFastened
UrethaneAdhesive
Hot Asphalt Cold Applied
ExamplesA construction of one layer of insulation mechanically
fastened to a structural deck with a vapor retarder and a second
layer of insulation mopped in hot asphalt would be described as
1MV1A .
Two layers of insulation mopped in hot asphalt to a structural
deck would be described as 2A .
One layer of insulation loose laid on a structural deck would be
described as 1L .
Deck Substrate: S = Steel C = ConcreteW = Wood G = GypsumL =
Lightweight Concrete T = Cementitious Wood Fiber
Insulation Specification
InsulationBottom LayerAttachment
InsulationTop LayerAttachment Deck Substrate
1MV1A Mech . Fastened Adhered S, W, L, C, G, T
1M1A Mech . Fastened Adhered S, W, L, C, G, T
1M1C Mech . Fastened Cold Adhesive S, W, L, C, G, T
1A Adhered L*, W*, C, G*, T*
2A Adhered Adhered L*, W*, C, G*, T*
1C Cold Adhesive L*, W*, C, G*, T*
1L Loose Laid S, W, L, C, G, T
1L1M Loose Laid Mech . Fastened S, W, L, C, G, T
1M Mech . Fastened S, W, L, C, G, T
1 MV2A Mech . Fastened Adhered S
V1A Adhered W**, L**, C, G**, T**
V2A Adhered Adhered W**, L**, C, G**, T**
* Insulation must be fully adhered to nailed base sheet .**
Vapor barrier must be adhered to nailed base sheet .
Roof Insulation Specifications
1MV1A1 Layer AdheredMechanically
Fastened VaporRetarder1 Layer
MechanicallyFastened
UrethaneAdhesive
Hot Asphalt Cold Applied
MechanicallyFastened
UrethaneAdhesive
Hot Asphalt Cold Applied
MechanicallyFastened
UrethaneAdhesive
Hot Asphalt Cold Applied
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Roof Insulations Specifications
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1-6 1-7RS-7387 11-13 (Replaces 11-12)RS-7387 11-13 (Replaces
11-12)
AdheredFirmly set the units of approved JM roof insulation, long
joints continuous and short joints staggered, into a full width
mopping of hot asphalt (within 25F [14C] of the EVT) . The asphalt
should be applied at a nominal rate
of 30 lb/100 ft2 (1 .46 kg/m2) . Porous substrates may require
greater amounts of asphalt . Concrete decks must be primed with
Asphalt Primer prior to the application of hot asphalt . Concrete
deck release moisture while curing . When adhering insulation with
hot asphalt, board size must be no greater than 4 x 4 (1 .22 m x 1
.22 m) . If insulation is being installed over an existing layer of
insulation or in multiple layers, all joints must be offset a
minimum of 6 (152 mm) between layers . Insulation may not be
adhered directly to wood, steel, gypsum, structural wood fiber or
lightweight insulating concrete decks . If insulation is adhered
over nailed base sheet, the nailing pattern shall be as shown below
.
Apply only as much insulation as can be covered by a complete
roof membrane in the same day . Do not leave insulation exposed to
the weather .
When nailing a base sheet to a nailable deck, JM requires the
fastening pattern illustrated below:
The side laps are secured 9 (229 mm) on center, and the center
of the sheet is secured with two staggered rows of fasteners 11
(279 mm) apart, fastened 18 (457 mm) on center .
Roof Insulation SpecificationsRecommendations for Attaching
Insulation to a Structural Deck
Roof Insulation SpecificationsSpecification 1A One Layer Asphalt
Attached
Note: See pages 1-12 through 1-18 for Roof Insulation Board
Fastening Placement Patterns .
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StructuralConcrete DeckFastener
RoofInsulation
StructuralConcrete Roof Deck
4
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.. . StructuralConcrete Roof Deck
RoofInsulation
Asphalt orCold Adhesive
Asphalt Primer
6
RoofInsulation
Asphalt orCold Adhesive
Wood or Plywood PlywoodRoof Deck
Base Sheet
Roofing Nail (Minimum 1" Head or Cap)Fastening pattern as shown
on page ___.
7
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Asphalt orCold Adhesive
RoofInsulation
LightweightConcrete RoofDeck
Base Sheet
Pre-Assembled Fastener and PlateFastening pattern as shown on
page ___.
5
11"
11"
11"18"
9"
Specification 1A
Asphalt PrimerWhere Required
Asphalt
Concrete Deck or Nailed Base Sheet
MechanicallyFastened
UrethaneAdhesive
Hot Asphalt Cold Applied
MechanicallyFastened
UrethaneAdhesive
Hot Asphalt Cold Applied
MechanicallyFastened
UrethaneAdhesive
Hot Asphalt Cold Applied
MechanicallyFastened
UrethaneAdhesive
Hot Asphalt Cold Applied
MechanicallyFastened
UrethaneAdhesive
Hot Asphalt Cold Applied
MechanicallyFastened
UrethaneAdhesive
Hot Asphalt Cold Applied
MechanicallyFastened
UrethaneAdhesive
Hot Asphalt Cold Applied
MechanicallyFastened
UrethaneAdhesive
Hot Asphalt Cold Applied
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Roof Insulations Specifications
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1-8 1-9RS-7387 11-13 (Replaces 11-12)RS-7387 11-13 (Replaces
11-12)
Mechanically FastenedApply the units of approved JM roof
insulation with long joints continuous . End joints should be
staggered so that they are offset at least 12 (305 mm) from the end
joints in adjacent rows . If insulation is being installed over
an
existing layer of insulation, all joints in the insulation
layers must be offset a minimum of 6 (152 mm) between layers .
Insulation boards should be tightly butted with adjacent boards .
Insulation joints greater than (13 mm) should be properly filled to
receive the subsequent layers of the roofing system . Use an
approved mechanical fastener of sufficient length to penetrate
through or into the deck as required by the specific fastener .
Fasteners should be placed in the pattern for the approval desired
but never closer than 6 (152 mm) from either edge of the insulation
board . On steel decks, the edges of the insulation board that run
parallel to the deck rib must be solidly supported by the ribs .
Fasteners are to be driven through the appropriate insulation
plates . Care should be taken not to overdrive or underdrive the
fastener . Overdriving the fastener will cause the insulation plate
to cup and can result in inadequate performance and damage to the
membrane . Underdriving can cause the insulation to be loose from
the deck and allow the fastener to penetrate into the membrane
.
Apply only as much insulation as can be covered by a complete
roof membrane in the same day . Do not leave insulation exposed to
the weather .
Roof Insulation SpecificationsSpecification 1MOne Layer
Mechanically Fastened
Loose LaidInsulation units may be loose laid with no means of
attachment to the structural deck in SPM Specification SE4B . It is
highly recommended that over steel decks, some means of mechanical
fastening be used . Install
insulation units with long joints continuous . End joints should
be staggered so that they are offset at least 12 (305 mm) from the
end joints in adjacent rows . The units of insulation should fit
snugly to adjoining units . If insulation is being installed over
an existing layer of insulation or in multiple layers, all joints
must be offset a minimum of 6 (152 mm) between layers . The
existing layers must be dry . Apply only as much insulation as can
be covered by a complete roof membrane in the same day . Do not
leave insulation exposed to the weather .
Any ApprovedDeck
Specification 1L
Cold AdhesiveFirmly set the top layer of approved JM roof
insulation, long joints contin-uous and short joints staggered,
into JM MBR Cold Application Adhesive . The adhesive should be
applied at a nominal rate of 2 to 3 gal/100 ft2 (1 .02 to 1 .22
l/m2), with a minimum application rate of 2 gal/100 ft2 (0 .82
l/m2) . If applied to porous materials, the application rate will
increase, depending on the absorbency of the material . Concrete
decks must be primed with Asphalt Primer prior to the application
of hot asphalt . If insulation is being
installed over an existing layer of insulation or in multiple
layers, all joints must be offset a minimum of 6 (152 mm) between
layers . Insulation may not be adhered directly to wood, steel,
gypsum, structural wood fiber or lightweight insulating concrete
decks . If insulation is adhered over nailed base sheet, the
nailing pattern shall be as shown in Specification 1A . Apply only
as much insulation as can be covered by a complete roof membrane in
the same day . Do not leave insulation exposed to the weather .
Specification 1C
Asphalt Primer
MBR Cold ApplicationAdhesive
Concrete Deck or Nailed Base Sheet
Roof Insulation SpecificationsSpecification 1L
One Layer Loose LaidSpecification 1C
One Layer Cold Adhesive Attached
Steel Plywood
Wood
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Concrete
Correct Screw must be seated to pull plate snug and flush
18-22 gauge steel deck
Point is " (19 mm) minimum thru deck
Incorrect Screw not properly seated, may puncture membrane
Screw must not be overdriven, causing plate to cup
MechanicallyFastened
UrethaneAdhesive
Hot Asphalt Cold Applied
MechanicallyFastened
UrethaneAdhesive
Hot Asphalt Cold Applied
MechanicallyFastened
UrethaneAdhesive
Hot Asphalt Cold Applied
MechanicallyFastened
UrethaneAdhesive
Hot Asphalt Cold Applied
ONESECTION
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Roof Insulations Specifications
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1-10 1-11RS-7387 11-13 (Replaces 11-12)RS-7387 11-13 (Replaces
11-12)
Mechanically FastenedApply the bottom layer of approved JM roof
insulation with long joints continuous . End joints should be
staggered so they are offset at least 12 (305 mm) from the end
joints in adjacent rows . Use an approved mechanical
fastener of sufficient length to penetrate through or into the
deck as required by the specific fastener . Fasteners should be
placed in the pattern for the approval desired but never closer
than 6 (152 mm) from either edge of the insulation board . On steel
decks, the edges of the insulation board that run parallel to the
deck rib must be solidly supported by the ribs . Fasteners are to
be driven through the appropriate insulation plates . Care should
be taken not to overdrive or underdrive the fastener . Overdriving
the fastener will cause the insulation plate to cup and can result
in inadequate performance . Underdriving can cause the insulation
to be loose from the deck .
Firmly set the top layer of approved JM roof insulation, long
joints continuous and short joints staggered, into a full width of
mopping of hot asphalt (within 25F [14C] of the EVT) . The bitumen
should be applied at a nominal rate of 30 Ib/100 ft2 (1 .46 kg/m2)
. All joints must be offset a minimum of 6 (152 mm) between top and
bottom layers of insulation .
Apply only as much insulation as can be covered by a complete
roof membrane in the same day . Do not leave insulation exposed to
the weather .
See Specification 1M for proper fastening of insulation into
other deck substrates .
Roof Insulation SpecificationsSpecification 1M1A Two Layers
Mechanically Fastened/Asphalt Attached
Mechanically FastenedApply the bottom layer of approved JM roof
insulation with long joints continuous . End joints should be
staggered so they are offset at least 12 (305 mm) from the end
joints in adjacent rows . Use an approved mechanical
fastener of sufficient length to penetrate through or into the
deck as required by the specific fastener . Fasteners should be
placed in the pattern for the approval desired but never closer
than 6 (152 mm) from either edge of the insulation board . On steel
decks, the edges of the insulation board that run parallel to the
deck rib must be solidly supported by the ribs . Fasteners are to
be driven through the appropriate insulation plates . Care should
be taken not to overdrive or underdrive the fastener . Overdriving
the fastener will cause the insulation plate to cup and can result
in inadequate performance . Underdriving can cause the insulation
to be loose from the deck .
Firmly set the top layer of approved JM roof insulation, long
joints continuous and short joints staggered, into JM MBR Cold
Application Adhesive . The adhesive should be applied at a nominal
rate of 2 to 3 gal/100 ft2 (1 .02 to 1 .22 l/m2), with a minimum
application rate of 2 gal/100 ft2 (0 .82 l/m2) . If applied to
porous materials, the application rate will increase, depending on
the absorbency of the material . All joints must be offset a
minimum of 6 (152 mm) between top and bottom layers of insulation
.
Apply only as much insulation as can be covered by a complete
roof membrane in the same day . Do not leave insulation exposed to
the weather .
See Specification 1M for proper fastening of insulation into
other deck substrates .
Roof Insulation SpecificationsSpecification 1M1C
Two Layers Mechanically Fastened/Cold Adhesive Attached
MBR Cold ApplicationAdhesive
Specification 1M1C
Steel Deck
Asphalt
Specification 1M1A
Steel Deck
MechanicallyFastened
UrethaneAdhesive
Hot Asphalt Cold Applied MechanicallyFastened
UrethaneAdhesive
Hot Asphalt Cold Applied
ONESECTION
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Roof Insulations Specifications
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1-12 1-13RS-7388 11-13 (Replaces 11-12)RS-7388 11-13 (Replaces
11-12)
Roof InsulationsFastener Placement4 x 4 (1.22 m x 1.22 m)
Boards
Roof InsulationsFastener Placement
2 x 4 (0.61 m x 1.22 m) Boards
6 Fasts. / Bd.
6"6" (Typ.)
24"
4 Fasts. / Bd.
12" (Typ.)
6" (Typ.)
2 Fasts. / Bd.
12" (Typ.)
7 Fasts. / Bd.
6"
6" (Typ.)24"
12"
5 Fasts. / Bd.
6" (Typ.)
6" (Typ.)
12"
24"
24"
3 Fasts. / Bd. - Staggered
6" (Typ.)
12" (Typ.)
6" (Typ.)
12"
"21 "21 "21
8 Fasts. / Bd.
6" (Typ.)
9 Fasts. / Bd.
6"
6"6"6"
12 Fasts. / Bd.
6"6" 6"
6"12"
12"
12"
6 Fasts. / Bd.
24"6"
6"
12"
12"
5 Fasts. / Bd.
6"6"
4 Fasts. / Bd.
12"(Typ.)
24"12"12"
6"
6"
6"6"
12"
12"
12"
11 Fasts. / Bd.
18" 18"
24"6"
6"
12"
12"
7 Fasts. / Bd.
8 Fasts. / Bd.
6"12"
12"
6"24"
24"
ONESECTION
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Roof
Insu
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Fast
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Fastener Placement
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1-14 1-15RS-7388 11-13 (Replaces 11-12)RS-7388 11-13 (Replaces
11-12)
Roof InsulationsFastener Placement4 x 8 (1.22 m x 2.44 m)
Boards
Roof InsulationsFastener Placement
4 x 4 (1.22 m x 1.22 m) Boards
14 Fasts. / Bd.
6"6" 6"
6"
12"
12" 12" 12"
24"
12"
12"
6"6" 6"
6"
12"
12" 12" 12"
12"
12"
24"
18 Fasts. / Bd.
6" 6"12" 12" 12"
24"6"
6"
9"9"9"9"
22 Fasts. / Bd.
6"6" 6"
6"
12"
12" 12" 12"
12"
12"
16 Fasts. / Bd.
24"6"
6" 6"
6"
12"
12" 12" 12"
12"
12"
17 Fasts. / Bd.
6"
6"
6" 6"12" 12" 12"
24"9"9"9"9"
20 Fasts. / Bd.
6 Fasts. / Bd.
36"
6"
12" 12"
8 Fasts. / Bd.
6"
12" 12"3 Spaces @ 24"
36"
6"
12" 12"
10 Fasts. / Bd.
3 Spaces @ 24"
36"
24"
6"
12"12"
9 Fasts. / Bd.
48"
24"
6"
11 Fasts. / Bd.
48" 36"
24"
12"12"
ONESECTION
ONESECTION
Roof
Insu
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Fast
ener
Pla
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Fastener Placement
-
1-16 1-17RS-7388 11-13 (Replaces 11-12)RS-7388 11-13 (Replaces
11-12)
Roof InsulationsFastener Placement4 x 8 (1.22 m x 2.44 m)
Boards
Roof InsulationsFastener Placement
4 x 8 (1.22 m x 2.44 m) Boards
12" 12"3 Spaces @ 24"
6"
6"
36"
24"
12 Fasts. / Bd.
18"
18"
36"48"
24"6"
6"12"12"
18"
18"
14 Fasts. / Bd.
3 Spaces @ 24"
6"
12"16 Fasts. / Bd.
6"
24"
6"
12"
15 Fasts. / Bd.
12"4 Spaces @ 18"
18 Fasts. / Bd.
6"
6"
6"
6"
18"
6" 24 Fasts. / Bd. 6"
6"
18"
22 Fasts. / Bd. 12"12"
6"
12"
20 Fasts. / Bd.
12"6"
18"
18"
28 Fasts. / Bd.
7 Spaces @ 12"
18"
24"6"
6" 6"
32 Fasts. / Bd.
3 Spaces@ 12"
6"7 Spaces @ 12"
24"
6" 6"
ONESECTION
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Insu
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Fast
ener
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Fastener Placement
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1-18 1-19
Roof Insulations Application
ONESECTION
ONESECTION
RS-7388 11-13 (Replaces 11-12)
Insulation Detail Patterns forFully Adhered MembraneFA-8
RS-8628 11-13 (Replaces 2-13)
Roof InsulationsFastener Placement
4 x 8 (1.22 m x 2.44 m) Boards
33 Fasts. / Bd.
7 Spaces @ 12"
3 Spaces@ 12"
6"6"
24"
3 Spaces@ 12"
6"
48"
36 Fasts. / Bd.
7 Spaces @ 12"
6"
24"
12"
6"
36"
36"
3 Spaces@ 12"
39 Fasts. / Bd.
7 Spaces @ 12"
6"
24"
24"
12"6"
48"
3 Spaces@ 12"
42 Fasts. / Bd.
7 Spaces @ 12"
6"
24"
24"
12"6"
12"
Roof
Insu
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Fast
ener
Pla
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Roof
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ONESECTION
ONESECTION
RS-8635 11-13 (Replaces 2-13)RS-8629 11-13 (Replaces 2-13)
Insulation Detail Patterns forFully Adhered MembraneUA-12
Insulation Detail Patterns forFully Adhered Membrane
FA-16
-
1-2
Roof
Insu
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ONESECTION
RS-8636 11-13 (Replaces 2-13)
Insulation Detail Patterns forFully Adhered Membrane
UA-12 INS
Section Two:JM PVC Membrane Application Guides, Specifications,
and Flashing Details
PVC Mem
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TWOSECTION
2AJM PVC Membrane Application Guides
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JM PVC Membrane Application Guide
RS-8339 4-15 (Replaces 11-13)
Section Two:JM PVC Membrane Application Guides,
Specifications, and Flashing Details
PVC Mem
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1.0 Introduction
This application guide describes standard procedures for
installing Johns Manville (JM) PVC roofing systems and has been
prepared for:
The Roofing MechanicJM recognizes that the success and long-term
performance of our roofing systems depend upon the personal skill,
experience and knowledge of the roofing mechanic.
JM PVC roofing systems offer important advantages for roofing
crews. Roofing membranes can be installed year-round with proper
roof deck preparation and some adjustments for weather
conditions.
How to Use This GuideThis guide is divided into five
sections:
1.0 Introduction2.0 Seaming and Fastening Methods3.0 Installing
Mechanically Fastened and Fully Adhered Roof Systems4.0 Roof
Penetrations5.0 Flashing Installation
This guide is designed for your convenience. These step-by-step
instructions and illustrations should answer your installation
questions and help you maintain top- quality craftsmanship when
applying a JM PVC roofing system.
JM PVC MembranesDifferent types of JM PVC Membranes are
manu-factured to meet a wide range of roof construction
requirements. These membranes are used for mechanically attached
and fully adhered roofing systems and are not intended for
ballasted roofs.
Each membrane sheet is marked along the edge with overlap lines.
These lines indicate the minimum overlap required and the area to
be welded. Mechanically attached methods using in-lap fastening
require a larger overlap. A minimum 1 (3.81 cm) welded seam is
required for all systems.
Mechanically Fastened and Fully Adhered RoofsThere are two basic
types of JM PVC roofing systems: mechanically fastened and fully
adhered.
Mechanically fastened roofs secure the membrane to the roof with
special fasteners, which vary depending on the roof deck
material.
Several construction variations are possible with mechanically
fastened roofs.
In fully adhered roofing systems, the membrane is bonded to the
substrate with special adhesives.
Roof Preparation (Re-Roofing)Proper roof deck preparation is
essential to simplify installation and prevent future conditions
that may lead to roof leaks.
Carefully sweep all roof surfaces to remove all debris and dirt.
Make sure the roofing area is completely smooth. Cut out large
blisters on asphalt or coal tar pitch roofs. Repair holes or cracks
in concrete, greater than (6.35 mm) wide with non-shrink grout.A
slip sheet is often used under the membrane.
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3. Thoroughly dry all weld surfaces prior to welding. 4.
Exercise caution when walking on dew, frost, ice or snow-covered
roofs, since
the membrane may be extremely slippery.
How Hot Air Welding WorksHot air welding works by applying very
hot air to the membrane surfaces, softening and fusing the surfaces
together, thereby creating a permanently fused, bonded sheet. One
of the major advantages of hot air welding is the fact that the
seam comes to full weld strength immediately.
Reducing Stresses on Welded SeamsSeams must be loaded in shear
and not in peel. A shear load would be in the plane (horizontal) of
the roof membrane. A peel load would be lifting the seam
perpendicular to the roof.
All roofs expand and contract during temperature changes. This
can produce mechanical stress in the membrane. It is important to
make welds that do not cause peel stresses to occur.
The correct and incorrect methods for welding at the roof
surface and side corners are described below.
Correct: Weld the membrane to horizontal surface of the JM
PVC-Coated Metal or membrane flashing, producing only horizontal
stress (shear stress) on the welded seam. This also helps transfer
stress to the roof structure.
Incorrect: The weld is subject to vertical stress (peel stress).
Peel stresses weaken, and may eventually rupture the welded
seam.
Hand-Held Hot Air WeldingMembranes can be hot air welded in many
different conditions, including cold weath-er. A hand-held hot air
welder is especially useful when welding membrane sections at
corners or on vertical surfaces. Hand-held hot air welders are also
used to weld membrane sections together or to weld membrane to JM
PVC-Coated Metal, which has factory-laminated PVC membrane on its
top side and a protective coating on the back.
Machine Hot Air WeldingLarge robotic hot air welders are used
for high-speed hot air welding of membrane seams. A variable speed
control for the electric motor lets you adjust the machines travel
speed along the seam. Movement of the welder along the seam is
determined by heat setting based on air temperature.
To hot air weld, insert the nozzle fully into the 2 (5.08 cm)
weld zone, and raise the back wheel to allow the machine to ride on
its two drive wheels. Dial in the desired temperature and
speed.
To steer the tool along the seam, use the welders guide wheel.
Watch the guide closely to make sure the machine stays on line.
Surface irregularities can cause the pressure wheel to move
slightly away from the seam. If this happens, tap lightly on the
ma-chines upper handle to maintain travel in a straight line.
Consult the hot air welder manufacturer for specific
recommendations.
As the hot air nozzle moves along the weld area, a wide drive
wheel behind the nozzle applies immediate and uniform pressure to
the heated area. The drive wheel presses
It provides a smooth surface and acts as a separator layer
between an existing, damaged roof and the new roof to be applied.
JM PVC Membrane application may require the installation of a
separator material between the JM PVC Membrane and the substrate.
This is most commonly achieved by the installation of a roof
insulation board or an approved separator sheet.
When using mechanical fasteners, if you are unsure of the deck
condition, perform pull-out tests of the fasteners being used to
confirm sufficient pull-out strength. Contact your supervisor, who
will obtain full details from the JM Roofing Services Group.
EquipmentThe following installation equipment may be
needed:Hammer drill ScissorsElectric drill Wire brushRivet gun
Chalk lineSnips ShovelGravel pusher PliersHammer TongsPull-out
tester Gravel-moving equipmentHand-held hot air welder Lawn or
linoleum rollerBrooms (soft and stiff) Drill bits (carbide,
steel)Screw gun Reciprocal sawGloves Grounded extension
cordsMeasuring tape Seam probeLadder First-aid kitPortable
generator Utility knifeRope Screwdriver setEye protection Rubber
malletWood saw RagsMetal crimpers Writing/marking
instrumentsVise-grip pliers T-squareSolvent-resistant pan Rollers
and brushes
2.0 Seaming and Fastening Methods
This section describes welding and fastening methods used to
install JM PVC roofing systems, including: installing hot air
welding membrane sections, using prefabricated JM PVC-Coated Metal
parts, fasteners used to anchor the roof to the roof deck, and
adhesive application of the membrane.
Seaming PrecautionsBefore welding, ensure area is clean and dry.
Remove dirt or contamination before welding by using low-sudsing
soap and water followed by JM Single Ply Membrane Cleaner or other
membrane cleaner. As a last resort, cut away the affected sheet
section and replace with new material.
Hot air welding equipment is required to make all field seams.
Welding speeds will be slower in high humidity conditions or at low
temperatures.
General Suggestions to Avoid Problems in Cold Weather (Below 50F
[10C])1. Store all JM PVC materials in warm, dry area away from
sparks and open flames,
to avoid condensation problems that could affect weld quality.2.
Take at least twice the usual number of seam samples to test for
peel resistance,
since the possibility of inferior welds is greater.
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JM PVC-Coated MetalJM PVC-Coated Metal is a special flashing
material used to fasten some JM PVC Membranes at roof edges
(perimeters), walls and decks, and around penetrations. It is
supplied in large, galvanized sheets with JM PVC Membrane material
laminated to one side. The roof membrane is welded to this surface.
The other side is covered with a protective coating (bronze
color).
JM PVC-Coated Metal Flashing is formed off site by the roofing
contractor, to the shapes required for attaching the membrane.
Preforming numerous perimeter flashing sections in the same shape
is easily and accurately done in the sheet metal shop.
Prefabrication reduces installation time. Special parts such as
scuppers, however, are formed on the job to match the opening size
and save time.
JM Fasteners and PlatesUse appropriate fasteners and plates on
mechanically fastened roofs to fasten the membrane and/or
insulation to the roof deck. Special screws and fasteners simplify
attachment of roof layers to wood, steel, concrete, lightweight or
other decks.
The most common method of installing a JM PVC mechanically
fastened roofing system is the in-lap method, where the membrane
overlap covers and protects the installed fasteners.
JM High Load and Extra High Load Fasteners and Plates are used
to attach the roof system to steel and wood decks. Special
fasteners are used for lightweight insulating concrete and concrete
decks.
JM supplies many fasteners for mechanically fastened roofs.
There are several key rules to follow when installing a
mechanically fastened roof:
1. Use appropriate fastener type for substrate.2. Securely
anchor fasteners to roof deck.3. Flatly seat and secure plates on
substrate.4. Do not tighten fastener/ plate assembly excessively,
which causes depression
of insulation.5. Achieve minimum thread penetration of (1.91
cm) through metal decks, 1 (2.54 cm) into wood decks and 1 (2.54
cm) into concrete decks with special spikes. Plywood and OSB decks
require a minimum (6.35 mm) penetration through the bottom of the
deck.
6. Fasteners must go through the top flange on metal decks.
Membrane AdhesivesJM PVC Membrane Adhesives (Low VOC and
Water-Based)JM PVC Membrane Adhesives are designed for bonding JM
PVC Membrane to approved substrates such as metal, wood, concrete
and certain roof insulations. Low VOC adhesive can be used for
adhered wall flashings or other vertical surfaces. The adhesives
are easily spread, have good initial tack and dry to an elastomeric
bond.
For additional product-specific information, refer to the JM PVC
Membrane Adhesive data sheets for low VOC and water-based
products.
the heated seam area together. Check all machine hot air welded
seams for voids and repair with a hand-held hot air welder before
the end of each working day. Always run several test welds with the
machine each time you begin welding and/or if the machine has been
shut down for any appreciable length of time.
With either method, perform a 4 or 5 (1.22 m or 1.52 m) test
weld before beginning each days application and any time the hot
air welder has been turned off for any length of time, to check
peel strength, consistency, weld width, etc., and to adjust the
welder.
First, adjust the temperature of the hot air welder to produce a
shiny membrane surface without burning the membrane. Fully insert
the tip of the hot air welder into the seam, moving it slowly
backwards. As the membrane softens, press the membrane surfaces
together with a silicone rubber roller from the inside edge to the
outside edge of the seam. Take care to produce a continuous weld
with no air pockets.
Repairing Scorched MembranesIf the membrane surface is
overheated, a good weld cannot be achieved. The burned or
discolored membrane must be patched.
To repair a burned section, cut away the damaged material at
least 1 (2.54 cm) beyond the burned edges. Patches should be cut to
extend at least 3 (7.62 cm) beyond all damaged edges. Allow for a
minimum 1 (3.81 cm) weld width on all sides.
Center the patch over the cut area and weld to the membrane,
using normal welding procedures. Cut all patches in a square or
rectangular shape with round corners for a neat, finished roof
appearance.
T-Joints and Testing SeamsT-JointsThe t-joint occurs where three
layers of membrane overlap. Voids may occur along the edge of the
middle layer of membrane. To close the void, gently lift the upper
membrane sheet and apply sufficient hot air to heat the membrane
surfaces. Then, using the edge of a silicone rubber roller, roll
and fuse the upper membrane surface into the lower membrane. A
crease developed along the intersection of the two surfaces
indicates a proper weld. JM recommends patching all t-joints to
include base flashing using a 4.5 (11.4 cm) rounded piece of
reinforced field membrane or JM PVC T-Joint Patch.
Testing SeamsHot air welded seams may be tested as soon as the
seams cool. After welding, carefully test every seam and t-joint
along its entire length. Do this by running a blunted scratch awl,
cotter key puller or other round-tipped, blunted tool along the
seam edge while applying firm, steady pressure. It is imperative to
avoid scoring the membrane that has just been welded. Any
penetration of the probe into the seam indicates a void in the
weld, which must be repaired. Continuous seam probing will tend to
sharpen the tip of the probe, so it is important to blunt the tip
of the probe regularly.
Test all welded seams for integrity and continuity before the
end of each work day. In addition to probing, take seam samples to
verify seam quality as necessary.
Cut the samples across the seam 6 (15.24 cm) on each side of the
seam and 2 (5.08 cm) wide. Peel these samples by hand to test seam
strength. Good seams will be virtually impossible to peel, and
should delaminate the PVC film from the reinforcing scrim. Cut and
test a minimum of three seam
samples each day in the morning, at noon and at days end. Take
additional test cuts when weather conditions change or after work
interruptions when the automatic hot air welder has been shut
off.
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Wall Flashing with JM PVC-Coated MetalJM PVC-Coated Metal Base
Flashing serves as a roof termination on roofs with low parapet
walls. A metal coping overlaps the JM PVC-Coated Metal Base
Flashing and serves as a counterflashing on walls which are 8
(20.32 cm) high or less.
Higher walls are sealed with JM PVC Membrane Flashing. See
Membrane Flashing section for application of fully adhered and
mechanically attached flashings.
Gravel StopsThe top of the gravel stop must be at least 1 (3.81
cm) above the nailer height. This may vary, depending on roof
conditions. The bottom edge of the flashing should extend at least
1 (2.54 cm) below the nailer on the vertical fascia surface.If the
vertical gravel stop face exceeds 4 (10.16 cm), fasten per the job
specifications, but not less than a 20-gauge to 24-gauge (0.91 mm
to 0.61 mm), continuous galvanized steel clip on the fascia.
Fasten continuous steel cleats per the job specifications, but
not less than two roofing nails, between flashing lengths. This
provides a rigid support for the gravel stop and helps align the
section. Use lengths of gravel stop to quickly position each cleat.
Fasten the gravel stop to the wood nailer with roofing nails spaced
6 (15.24 cm) o.c. and staggered. Leave a 38 to (9.53 mm to 1.27 cm)
gap for expansion between gravel stop lengths. Apply aluminum tape
to the joint prior to heat welding the joint covers and membrane in
place.
Johns Manville recommends installing two fasteners per butt
joint to prevent rocking. This will also secure the edges at the
break.
Membrane FlashingsInstall all membrane flashings at the same
time as the roof membrane. Do not use temporary flashings. If water
penetrates the flashings, immediately replace all affected
materials.
Use only JM PVC fully adhered or mechanically attached flashings
or prefabricated flashings, depending on job circumstances. Secure
the mechanically attached flashings to the parapet wall at a
maximum vertical distance of 18 (45.72 cm) o.c., and horizontally
to the parapet at maximum spacing of 12 (30.48 cm) o.c. Secure
adhered flashings to the parapet wall at 60 (152.4 cm) vertical
intervals. All adhered surfaces must be compatible with JM PVC
roofing membranes. If
existing asphalt flashing remains, then 1532 (1.91 cm) thick
plywood, 916 (1.43 cm) OSB, 26-gauge (0.45 mm) galvanized metal (if
using adhered flashings), or 9 oz./yd2 (0.31 kg/m2) polyester
fleece must be secured to the asphaltic surface as a barrier before
applying JM PVC Membrane Flashings. Paper slip sheets are not
acceptable for use as asphalt barriers. Apply adhesive as noted in
Fully Adhered Systems on page 2-10 of this guide. Do not apply
adhesive to any flashing areas that will be welded.
Extend all flashings a minimum of 8 (20.32 cm) above the roof
level. Contact the JM Roofing Services Group for recommendations if
this cannot be done. Terminate all JM PVC Membrane Flashings per
the applicable detail.
Roof Substrate MaterialsVapor RetardersVapor retarders prevent
moisture or condensation from entering the building or passing from
the building into the roof system. To provide an effective shield
against water vapor, seal off all vapor retarders at roof edges and
penetrations.
3.0 Installing Mechanically Fastened and Fully Adhered Roof
Systems
This section describes the procedures and materials used to
install mechanically fastened and fully adhered JM PVC roofs.
Included are flashing installation, membrane installation, membrane
fastening procedures for mechanically fastened roofs and adhering
roof membranes.
Installation PreparationNailersAfter properly preparing the roof
deck, install wood nailers when required. Place nailers on the
perimeter of the roof, along the top of parapet walls and, where
required, around roof penetrations and along roof expansion joints.
Set the height of the nailers flush with the roof insulation.
Space fasteners for wood nailers per the job specifications, but
not greater than 24 (60.96 cm) o.c. with at least three fasteners
per nailer, depending on nailer length. Each fastener must resist a
minimum pull-out force of 200 lb/ft (298 kg/m) in any direction. JM
PVC-Coated Metal Flashings are fastened to wood nailers. When using
membrane flashings, fasten the field sheet to the deck with a
fastener/plate system.
JM PVC-Coated Metal FlashingPreformed JM PVC-Coated Metal
Flashing is fastened around the roof perimeter (edge and base
flashings) and roof penetrations. Welding the membrane to JM
PVC-Coated Metal Flashings at these points provides a watertight
seal.
JM PVC-Coated Metal Flashing (along with wall fastening strips)
is manufactured in 10 (3.05 m) lengths. Leave a 38 to (9.53 mm to
1.27 cm) maximum gap between each length to allow for thermal
expansion. Aluminum tape should be applied over all joints in JM
PVC-Coated Metal prior to heat welding the joint covers and
membrane in place.
The following are instructions for installing JM PVC-Coated
Metal Base Flashing, wall fastening strips and gravel stops.
Base Flashing with JM PVC-Coated MetalSet the base flashing
width along the horizontal roof surface (flange) at least 3 (8.89
cm) to allow for welding. Flashing must extend a minimum of 8
(20.32 cm) up vertical wall surfaces.
Fasten base flashing to nailers per the job specifications, as a
minimum using galvanized roofing nails, spaced a maximum of 6
(15.24 cm) o.c. to resist a minimum pull-out force of 200 lb/ft
(298 kg/m). Nail heads should be at least 38 (9.53 mm) in diameter,
penetrat-ing into the nailer at least (1.91 cm).
You may fasten JM PVC-Coated Metal Base Flashing directly to the
parapet wall under some conditions. Consult job specifications.
Fasteners must provide a minimum pull-out force of 200 lb/ft (298
kg/m), placed at a maximum height of 2 (5.08 cm) above the top
surface of the JM PVC Membrane.
Fasten JM PVC-Coated Metal Base Flashing to concrete with
concrete fasteners. Space fasteners per job specifications, but not
greater than 12 (30.48 cm) o.c. and drive at least 1 (2.54 cm) into
concrete to obtain the required pull-out strength. JM PVC-Coated
Metal Base Flashing can also be fastened to hollow block (cinder
block) walls, with the appropriate fasteners. Consult JM for more
details. JM PVC Coated Metal Flashing can be used as an asphalt
separator in lieu of plywood or galvanized metal.
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Corners and PerimetersRefer to the local code requirements,
project specifications or FM Global requirements when determining
fastener rates. The requirements to calculate perimeter areas are
as follows:
1. 40% of the height or 10% of the lesser plan dimension,
whichever is less, but never less than 4% of the lesser plan
dimension (minimum 3 [91.44 cm]).
2. For mechanically fastened systems, only perimeter rolls may
be used in these areas. The width of the perimeter rolls should be
no greater than 60% of the width of the field sheets in the
perimeters, and no greater than 40% of the width in the
corners.
Corner AreasAll corners shall be the intersections of the
perimeter areas. Refer to the local code requirements, project
specifications or FM Global requirements when determining corner
layouts for perimeter sheets. Typically, one of the following
layouts is used in the corners:
1. The perimeter rolls should be fastened all the way into the
corner. The other perimeter sheets are fastened up to the
previously installed perimeter sheets, and then the fastener rows
are continued to the corner through the top of the previously
installed sheets and a cover strip of reinforced membrane or a JM
PVC T-Joint Patch is installed over the fasteners for a watertight
seal.
2. The perimeter rolls should be run perpendicular to the flutes
in steel deck applications. Additional fasteners should be
installed in rows that are no greater than 40% of the width of the
field sheets. These fastener rows should then be stripped in with
reinforced JM PVC Membrane, or Detail Strip.
Section 2 describes the plates and methods used to mechanically
fasten JM PVC roofs. The following are step-by-step procedures for
in-lap fastening:
The In-Lap Method1. Roll out one roll of membrane over the slip
sheet (if required) or acceptable
insulation board. Let it relax 15 to 30 minutes or as needed to
compensate for any residual roll tension.
2. Secure the plate along the edge of the membrane, maintaining
at least a (1.27 cm) distance from the edge of the plate to the
outer edge of the roll. Fastener and plate spacing is per FM Global
requirements and/or job specifications.
3. Tightly screw down the plates (do not overdrive the fastener)
using an appropriate screw gun unit with adjustable clutch. Make
certain to drive the fastener perpendicular to the surface of the
substrate and to properly penetrate the deck surface. On steel
decks, the screws must be fastened into the top flanges of the
metal deck.
4. After securing the edge of the first membrane roll, roll out
the next adjacent roll of membrane. Position this roll so that its
common edge fully overlaps the row of plates and fasteners just
installed. Maintain a minimum overlap of 6 (15.24 cm) (depending on
plate size) to cover the plates, and leave the required 1 (3.81 cm)
minimum for the seam weld.
5. Weld the overlap seam.
Air BarriersAir barriers should be considered on jobs where high
internal air pressure exists, such as airport hangars or
distribution warehouses with many outside openings (such as loading
docks), outdoor amphitheaters, etc.
InsulationInsulation must be independently fastened to the roof
deck in mechanically attached and adhered systems. Adhering certain
insulations in hot asphalt or cold adhesives is sometimes
acceptable for adhered systems. For specific requirements, contact
the JM Roofing Services Group.
Always cut insulation to fit closely around all roof
penetrations. Around drains, taper insulation a minimum of 36 x 36
(91.44 cm x 91.44 cm) for proper drainage.Apply rigid insulation
directly over fluted steel decks to provide smooth, continuous
membrane support. Insulation should be installed with long edges
parallel to the direction of the deck and supported by the deck
flange. When butting insulation layers, do not allow the edge of
either board to overlap an open flute. Cut the insulation so the
edge of the board is about at the center of, and supported by, the
flange.
Slip sheetsA slip sheet is often used under the membrane on
mechanically fastened roofs. It provides a smooth surface over
which the membrane can freely expand or contract when temperature
variations cause changes in the roof structure.
The slip sheet is loosely laid and usually overlapped, depending
on the slip sheet selected. It should be neatly cut to fit closely
against roof edges and around penetrations. An approved slip sheet
must be used between the JM PVC Membrane and any polystyrene
insulation product.
Coal Tar PitchCoal tar pitch roofs give off noxious fumes and
vapors that affect PVC roofing membranes. You must separate coal
tar pitch roofs from the vinyl in the following manner:
Place insulation with a minimum R-value of 8.6 (hrft2F)/ Btu
[1.76 m2C/W] and a minimum thickness of 1 (3.81 cm) atop the roof,
with the joints of the insulation butted together at all four
sides.
Installing MembranesUnroll the JM PVC Membrane and position
without stretching. Allow the membrane to relax at least 15 minutes
when the temperature is above 60F (16C), or 30 minutes when the
temperature is below 60F (16C), prior to installation. Inspect for
any damaged membrane. Remove sections of the membrane that are
creased or damaged.
Install all roof deck materials (vapor retarders, insulation and
slip sheet) in complete sections, and cover with the membrane
immediately to produce weather-tight sections each day. Phased
construction is not permitted.
For mechanically attached systems on steel decks, the membrane
sheets must be applied perpendicular to the ribs (flutes) of the
deck. This method offers two advantages. First, most roofs are
pitched to drain along the roofs length. Many roofs drain from each
end to the middle. In this case, the installation is started at the
wall edge, and the membrane is welded and sealed immediately
against water. It also requires less work to seal the shorter edge
of the roof with a water cutoff at the end of the work day. And you
will save money by removing and discarding less cut-off
material.
Welding Membranes to Roof EdgesThe JM PVC-Coated Metal Edge is
installed and is stripped into the field sheet with a detail
strip.
Mechanically Fastened SystemsTo prevent wind uplift and secure
the membrane on mechanically attached roofs, fasten the membrane to
the roof deck with metal plates and acceptable fasteners.
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JM PVC Membrane Application Guide JM PVC Membrane Application
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RS-8339 4-15 (Replaces 11-13) RS-8339 4-15 (Replaces 11-13)
Low VOC, Two-Sided Application for Plain-Backed (Smooth-Backed)
MembraneApply low VOC adhesive in a smooth, even, thin coat to both
membrane and approved substrate at the rates listed on specific
product data sheets. Most applications apply approximately half the
listed rate to the membrane and the other half to the substrate.
For porous substrates such as wood and gypsum, apply more adhesive
on the substrate.
PVC systems require adhesive to become tacky to the touch on
both surfaces without stringers on the substrate only. Membrane
side must dry slightly to the point where stringers are visible. Do
not allow adhesive on both sides to dry completely; if no longer
tacky it cannot be used.
Water-Based, Two-Sided Application for Plain-Backed
(Smooth-Backed) Membranes OnlyApply water-based adhesive in a
smooth, even, thin coat to both the membrane and approved substrate
at the rates listed on specific product data sheets. Most
applications apply approximately half the listed rate to the
membrane and the other half to the substrate. For porous substrates
such as wood and gypsum, apply more adhesive on the substrate.
Adhesive should be tacky at point of assembly: approximate time
will vary depending on the environmental conditions. Once the
adhesive begins to change color (from white to clear) and feels
tacky, but with no stringers as with the low VOC adhesive,
carefully roll the membrane to the substrate. Avoid capturing air
or creating wrinkles during this process. If adhesive is completely
dry or too wet (still all white), adhesion will be compromised.
Water-Based, One-Sided Application for Fleece-Backed Membranes
OnlyFor fleece-backed membrane ONLY, apply the full rate of
water-based adhesive to the substrate ONLY. Do not apply adhesive
to the membrane. DO NOT apply to the fleece-backed membrane or in
the weld area; keep both surfaces clean and dry. Assemble membrane
and substrate while adhesive on the substrate is still wet.
Water-Based Adhesives Cautions Water-based adhesives are white;
if product appears to have disappeared after
application then adhesive is too dry and will need to be
reapplied. Do not over apply. Use the coverage rate chart in this
section; too much adhesive
will result in curing issues. Prior to application and curing,
water-based adhesive can NEVER be exposed or
stored to temperatures below 40F. Do not apply when ambient
temperatures are expected to drop below 40F within 48 hours after
application.
Suggested Coverage Rate Ranges
Adhesive Ft2/gal (gal/sq)
Low VOC 90 (1.11) 80 (1.25) 70 (1.43) 60 (1.67) 50 (2.0)
Water-Based 130 (0.77) 120 (0.83) 110 (0.91) 100 (1.0) 90
(1.11)Product Less Adhesive / More Adhesive
Insulation and Cover Boards
Invinsa
DensDeckWood Fiber
ENRGY 3
DensDeckPrime
SECUROCKGypsum Fiber
Roof Board
Notes: 1. Listed rates are for finished roofing areas. 2. See JM
requirements for correct application method. 3. Two-Sided
Application: Most applications apply approximately half the listed
rate to the membrane and the other half to the substrate. For
porous substrates such as wood and gypsum, apply more adhesive on
the substrate. 4. One-Sided Application: Apply the full amount to
the substrate only. If the rate is 1.0 gal/sq, the full gallon goes
on the substrate only.
Fully Adhered SystemsAll membranes and substrates to be adhered
must be approved by Johns Manville. Both surfaces must be clean,
smooth, dry, compatible and free of contaminants and grease/ oil.
All fasteners, if required, must be properly seated and plates
flush, leaving an acceptable surface to receive adhesive.
Unroll the membrane and allow it to relax at least 15 minutes
before applying adhesive; longer time is necessary in colder
weather.
Position the membrane with a 3 (7.62 cm) overlap between sheets.
Fold membrane back one-half of the length of the first sheets
length to expose its bottom side.
Make sure adhesive container is sealed. Turn upside down and
wait a minimum of five minutes then turn containers right side up.
Carefully open and vigorously stir until adhesive is a uniform
color and all solids are dispersed, with NO SWIRLS.
Saturate roller by dipping into can. Roll adhesive onto
substrate and membrane for smooth-backed membrane, and substrate
only for fleece-backed membrane.
For solvent-based adhesives, the appearance of a spider web
effect will occur with stringers off the roller when the roller
needs to be redipped into the adhesive. It will also be hard to
push the roller.
Follow directions in this section for specific adhesive and
membrane type (smooth-backed or fleece-backed) as directed for
proper applications.
When adhesive is ready, carefully roll the membrane into the
substrate avoiding wrinkles. Apply even pressure with a lawn or
linoleum roller (minimum 75 lb [34 kg]) to ensure good contact
between the membrane and substrate.
Do not apply adhesive in the seam area; seams are to remain
clean and dry. Avoid puddling of adhesive. With adhesives, more is
not necessarily better. Over-coating adhesives will lead to poor
adhesion.
Do not use with polystyrene foam.
Adhesive coverage, open time and dry time rates can vary
dramatically depending on the particular substrate and
environmental conditions. Coverage rate charts, stated herein, are
approximate only. If FM Global or UL approval is required, please
consult the specific RoofNavSM or UL Certification Directory for
specific application rates.
Substrate for Adhered Membrane
Substrate JM PVC JM PVC Fleece-Backed
Lightweight Concrete N/A WB
Concrete N/A WB/HA
Invinsa WB/LVOC WB
SECUROCK Gypsum Fiber Roof Board WB/LVOC WB/HA
Wood Fiber P/A P/A
ENRGY 3 WB/LVOC WB
DensDeck Prime WB/LVOC WB
Key: WB = Water-Based LVOC = Low VOC HA = Hot Asphalt N/A = Not
Applicable P/A = Pre-Approval Required
Notes: 1. Water-Based Adhesive: Use the two-sided contact
application method for all smooth-backed single ply membranes. Use
the one sided application method for fleece-backed membranes only.
2. DensDeck: Priming of the board is required. 3. Not suitable for
SECUROCK Glass-Mat roof boards. 4. Do not use solvent or low VOC
solvent with fleece-backed membrane.
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JM PVC Membrane Application GuideUrethane Adhesive
(RSUA)Installation Instructions
JM PVC Membrane Application GuideUrethane Adhesive (RSUA)
Installation Instructions
Coverage Fleece-Backed MembranesBead spacing: 12 o.c. Applied
bead size: min.
PackagingTypical Coverage Rates
per package* ft2/gal gal/100 ft2*Cartridge 300 ft2/case 189
0.55 gal 2,000 ft2/set**
20015 gal drum 6,000 ft2/set** 50 gal drum 20,000 ft2/set**
Coverage Fleece-Backed MembranesBead spacing: 6 o.c. Applied
bead size: min.
PackagingTypical Coverage Rates
per package* ft2/gal gal/100 ft2*Cartridge 150 ft2/case 94 1.15
gal 1,000 ft2/set**
100 1.015 gal drum 3,000 ft2/set** 50 gal drum 10,000
ft2/set**
Coverage Fleece-Backed MembranesBead spacing: 4 o.c. Applied
bead size: min.
PackagingTypical Coverage Rates
per package* ft2/gal gal/100 ft2*Cartridge 100 ft2/case 63 1.595
gal 667 ft2/set**
67 1.4915 gal drum 2,000 ft2/set** 50 gal drum 6,667
ft2/set**
Coverage Board StockBead spacing: 12 o.c. Applied bead size: -
min.
PackagingTypical Coverage Rates
per package* ft2/gal gal/100 ft2*Cartridge 300-400 ft2/case
189-252
0.4-0.55 gal 2,000-2,500 ft2/set**
200-25015 gal drum 6,000-7,500 ft2/set** 50 gal drum
20,000-25,000 ft2/set**
Coverage Board StockBead spacing: 6 o.c. Applied bead size: -
min.
PackagingTypical Coverage Rates
per package* ft2/gal gal/100 ft2*Cartridge 150-200 ft2/case
94-126 0.8-1.15 gal 1,000-1,250 ft2/set**
100-125 0.8-1.015 gal drum 3,000-3,750 ft2/set** 50 gal drum
10,000-12,500 ft2/set**
Coverage Board StockBead spacing: 6 o.c. Applied bead size: -
min.
PackagingTypical Coverage Rates
per package* ft2/gal gal/100 ft2*Cartridge 100-133 ft2/case
63-84 1.19-1.595 gal 667-833 ft2/set**
67-83 1.2-1.4915 gal drum 2,000-2,500 ft2/set** 50 gal drum
6,667-8,333 ft2/set**
* Coverage rates are approximate and may vary based on substrate
type and application. Approved substrates include structural
concrete decks, JM Vapor Barrier SA, ENRGY 3, RetroPlus, DuraBoard,
Invinsa, Securock, DensDeck, DensDeck Prime, smooth modified
asphalt membranes and granulated asphalt membranes. Please contact
JM Technical Services for other approved substrates.
** A set is defined as an equal Part 1 and Part 2.
General Application Instructions
All applications must be approved by Johns Manville.
All surfaces must be clean, smooth, dry, compatible and free of
dirt, debris, oil/grease and gravel. All fasteners, if required,
must be properly seated and plates flush, leaving an acceptable
surface to receive ad hesive.
JM RSUA Packaged in 1,500 ml CartridgesRemove the molded cap at
the top of the cartridge and attach the supplied static-mix-ing
nozzle to the threaded mixing head. Place the cartridge into the
appropriate JM RSUA applicator.
JM RSUA Packaged in 5-Gallon BladderRemove bladder from box.
Remove the white disc closure from the top of the packaging and
extend quick-connect spouts in both Part 1 and Part 2 boxes. Invert
bladder and place in appropriate tray on the Garlock Cyclone (or
similar). Box labeled Part 1 must be in area of tray labeled Part 1
and box labeled Part 2 in area labeled Part 2.
Connect the black Part 1 fitting to the black inlet hose fitting
Connect the gray Part 2 fitting to the gray inlet hose fitting
Operate pump according to manufacturers instructions On a scrap
piece of material, dispense a small amount of RSUA. Let rise to
ensure
equipment and adhesive are on-ratio
For Membrane ApplicationUnroll the membrane and allow it to
relax at least 15 minutes before applying adhesive; longer time may
be necessary in colder weather. Position the membrane with a 2
(5.08 cm) overlap between sheets. Fold membrane back one-half of
the length of the first sheets length to expose its bottom
side.
For Board and Membrane ApplicationApply JM RSUA directly to the
substrate and allow it to begin to rise and build body before
placing fleece-backed membrane or board stock into the
adhesive.
Membrane attachment requires the membrane be rolled with a 150lb
roller to ensure positive contact between membrane, adhesive and
substrate.
Board stock attachment requires the board stock to be walked in
to ensure positive contact between the board stock, adhesive and
substrate.
Do not allow the adhesive to skin over. Eliminate uneven
surfaces to ensure positive contact between the insulation board/
membrane and substrate.
Typical Lock-Down/Tack-Free Times
Ambient Temperature Lock Down/Tack Free Time
40F 9-10 minutes
60F 6-7 minutes
80F 4-5 minutes
100F 3-4 minutes
Unused material can be applied at a later date by simply
plugging the cartridges (with provided caps) and using a new static
mixing nozzle. When using the box packaging, properly clean
dispensing wand and pump unit according to the pump manufacturers
recommendation.
Refer to the Safety Data Sheet and product label prior to using
this product.
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RS-8339 4-15 (Replaces 11-13) RS-8339 4-15 (Replaces 11-13)
Weld the membrane collar continuously to the field sheet and/or
the metal collar. Field wrap JM PVC Detail Membrane around the pipe
stand and adhere to the vent pipe, while flanging the bottom of the
field wrap. Extend field wrap flange at least 1 (2.54 cm) onto the
membrane stretch collar and weld continuously to the collar. If the
pipe has asphalt or other contaminants on it, it must be cleaned
and wrapped completely with aluminum tape before installing the
flashing.
Method B. Installing Prefabricated Vent Pipe Boots (See Detail
P-FP-01) JM PVC Pipe Boots are available to accommodate various
diameters for installation over pipes.
Prior to pipe boot installation, remove any asphaltic deposits
from vent pipes before using this prefabricated boot. Completely
wrap any remaining asphalt with aluminum tape before plastic boot
comes into contact with pipe. Bring the JM PVC Field Sheet to the
pipe and attach with a minimum of four fasteners around the vent
stack. Place the prefabricated pipe boot over the pipe and weld
continuously around the bottom lip of the boot.
Apply JM Single Ply Caulk behind the pipe boot turn-up before
pulling draw band tight around the vent pipe, and to the top of the
draw band to seal against water intrusion.
Penetration PocketsJM Penetration Pockets are either premolded,
plastic units available in standard sizes, or are fabricated using
JM PVC-Coated Metal.
Leave an open, overlapped seam at the center of one side so the
penetration pocket may be spread around penetrations before final
riveting. The overlap or opening must be covered with aluminum tape
and detail membrane prior to stripping flange. Minimum penetration
pocket height is 4 (10.16 cm).
Fasten penetration pocket flanges at the outside to the deck or
nailer. With strips of JM PVC Membrane, strip in penetration pocket
around all four sides, and weld continuously to JM PVC-Coated Metal
as you would a field sheet.
Fill penetration pocket with JM EPDM/PVC Pourable Sealer. Fill
until mounded above penetration pocket. Slope from pipe to
penetration pocket edges to shed water (no ponding water should be
present in penetration pocket). Fasten penetration pockets greater
than 18 x 18 (45.75 cm x 45.72 cm) to nailers securely anchored to
the deck.
Fabricated penetration pockets follow the same procedure, except
that the plastic flange is fastened to the deck before being
stripped in. Since you can weld the plastic penetration pocket to
the strip of membrane, continuously weld the strip to the flange
and the field sheet.
WalkwaysIf pavers are used as permanent walkways for maintenance
of rooftop equipment, use an additional layer of JM PVC Membrane or
a layer of JM Polyester Mat Protection Material under paver blocks
to protect the membrane.
Another walkway option on a mechanically fastened or adhered
roof is to weld strips of JM PVC Walkpad or Heavy- Duty Walkpad
material directly to the membrane. See details P-PT-05, 06, &
07 and note that walkpads should not be installed over field seams.
This material provides an almost continuous walkway, and is
embossed for a skid-resistant surface. It also minimizes added
weight on roofs. JM PVC Walkpad or Heavy-Duty Walkpad should be
continuously welded to the membrane and checked for voids, which
must be repaired with a heat welder. Continuously welding the
walkway material will seal against grit or water entry. Fully
adhered systems require walkpads to also be fully adhered.
Water CutoffsSensitive materials such as insulation or slip
sheets can be damaged or destroyed by water. Apply water cutoffs to
seal the edge of roofing layers at the end of the work day. If a
cutoff is required on an existing gravel-surfaced roof, completely
spud off the gravel for a watertight connection.
4.0 Roof Penetrations
This section describes procedures for fabricating, installing
and welding typical roof penetrations to the membrane. Included are
drains, vent pipes and penetration pockets.
Weld membranes to flashings around roof penetrations and to base
flashings as a continuous, waterproof roofing shield. Install
nailers where required around penetrations for flashing
support.
DrainsThere are several methods for flashing drains with JM PVC
roofing membrane. The most common method is to taper insulation to
the drain bowl. Next, run slip sheet (if required) over insulation
to edge of drain bowl interior.
Apply one tube of JM Single Ply Sealing Mastic around the drain
bowl. Apply the JM PVC Membrane to overlay drain area, and cut out
hole in center area 2 (5.08 cm) smaller than metal drain bowl
diameter. Cut round holes one-half the size of bolt diameter at
drain bolt penetrations. Make sure there are no seams or fasteners
through the drain clamping ring. Ideally, there should be no seams
or fasteners in the drain sump.
Carefully press membrane drain flashing over drain bowl area and
work into the mastic to form seal. Place metal clamping ring over
membrane flashing so that bolt holes line up, and then tighten the
bolts (see detail P-DV-08).
Vent PipesThere are two primary methods for installing vent
pipes in JM PVC roofing systems:
Method A. Sealing Pipe Base with JM PVC Flashing
(P-FP-06)Prepare a square JM PVC Detail Membrane stretch collar to
overlap the securement plate edges by at least 4 (10.16 cm), to
accommodate sheet movement and a 1 (3.81 cm) weld width. Round off
all corners. Cut a hole in the center of the membrane that is about
two-thirds of the diameter of the pipe. Center hole over the pipe;
heat area around the hole with a heat welder, and stretch fit
membrane over the pipe to create a 1 (2.54 cm) turn-up, with the
collar seated flush on the deck.
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Step 2
Overlap the successive layer of membrane flashing 2 (5.08 cm)
minimum over the previously installed sheet. Provide the minimum
base overlap as required.
Step 3
Form membrane to wall as required. The JM PVC Membrane Flashing
must extend a minimum of 12 (30.48 cm) horizontally in each
direction from the corner point.
Cut the membrane flashing base lap to allow the membrane
flashing to turn the corner. Install fasteners at corners where
required by system details.
Step 4
Turn the corner and apply the membrane flashing as required.
Round the corners of the membrane base overlap on each side of the
corner and
at all ends of the flashing base overlap.
5.0 Flashing Installation
Machine Hot Air Welding
Step 1
Set the heat and speed setting on the automatic welding machine
based on field conditions and air temperature. Make certain that
proper power supply is available.
Align the welding machine with the edge of the membrane seam lap
as required, and insert the nozzle fully into the 1 (3.81 cm) weld
zone.
Raise the back wheel to allow the machine to ride on its two
drive wheels. Adjust the heat and speed setting on the automatic
welding machine as required. To steer the machine along the seam,
place the small guide wheel (located at
the front of the machine) against the seams edge. Adjust and
maintain the wheel against the seams edge as required.
Align drive wheel and welder tip and extend 18 (3.18 mm) beyond
the edge of the seam so there are no loose edges of membrane.
JM PVC Membrane Base FlashingOutside Corner
Step 1
Cut JM PVC Membrane Base Flashing extending vertically 8 (20.32
cm) minimum, leaving enough membrane at the flashing base to
overlap fasteners/plates and to provide for a 1 (3.81 cm) minimum
continuous weld. Apply adhesive to both membrane and substrate as
required. See Fully Adhered Systems section in the appropriate
guide specification.
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RS-8339 4-15 (Replaces 11-13) RS-8339 4-15 (Replaces 11-13)
Step 3
Form membrane to wall as required. The JM PVC Membrane Flashing
must extend a minimum of 12 (30.48 cm) horizontally in each
direction from the corner point.
Fold over the membrane flashing base lap (forming a pigs ear) to
allow the membrane flashing to turn the corner.
Turn the corner and apply the membrane flashing as required.
Step 4
Using a pair of shears, make a diagonal cut in the pigs ear,
forming an overlap. Round the corners of the membrane base overlap
on each side of the corner and at
all ends of the flashing base overlap.
Step 5
Using a hand-held hot air welder and roller, heat weld the
bottom flap of the pigs ear to the field membrane and the top flap
over the bottom flap.
Step 5
Install a JM PVC Universal Corner welded to the flashing sheet
with a continuous 1 (2.54 cm) minimum heat weld. Care must be taken
to leave an unwelded area at the center of the corner to allow for
movement.
Probe and check all seams.
JM PVC Membrane Base FlashingInside Corner
Step 1
Cut JM PVC Membrane base flashing extending vertically 8 (20.32
cm) minimum, leaving enough membrane at the flashing base to
overlap fasteners/plates and to provide for a 1 (3.81 cm) minimum
continuous weld. Apply adhesive to both membrane and substrate as
required. See Fully Adhered Systems section in the appropriate
guide specification.
Step 2
Overlap the successive layer of membrane flashing 2 (5.08 cm)
minimum over the previously installed sheet. Provide the minimum
base overlap as required.
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RS-8339 4-15 (Replaces 11-13) RS-8339 4-15 (Replaces 11-13)
Step 3
Form membrane to curb as required.
Step 4
Round the corners of the membrane base overlap on each side of
the corner and at all ends of the flashing base overlap.
For each corner: Install a JM PVC Universal Corner to the
flashing sheet with a continuous 1 (2.54 cm)
minimum heat weld. Care must be taken to leave an unwelded area
at the center of the corner to allow for movement.
Probe and check all seams.
Step 6
Install a JM PVC Universal Corner (not pictured) welded to the
flashing sheet membrane with a continuous 1 (2.54 cm) minimum heat
weld. Care must be taken to leave an unwelded area at the center of
the corner to allow for movement.
Probe and check all seams.
JM PVC Membrane Curb Flashing
Step 1
Cut JM PVC Membrane Base Flashing extending vertically 8 (20.32
cm) minimum, leaving enough membrane at the flashing base to
overlap fasteners/plates and to provide for a 1 (3.81 cm) minimum
continuous weld. Apply adhesive to both membrane and substrate as
required. See Fully Adhered Systems section in the appropriate
guide specification.
Step 2
Overlap the successive layer of membrane flashing 2 (5.08 cm)
minimum over the previously installed sheet. The JM PVC Membrane
Flashing must overlap a minimum of 2 (5.08 cm) from the corner
point as shown. Provide the minimum base overlap as required.
8"(20.32 cm)
Min.
2"(5.08 cm)Min.
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RS-8339 4-15 (Replaces 11-13) RS-8339 4-15 (Replaces 11-13)
On remaining two sides of the curb: Cut JM PVC Membrane Base
Flashing as required to conform to the canted curb
base with mitered corners at the base overlap. Form membrane to
curb as required.
Step 4
Round the corners of the membrane base overlap on each side of
the corner and at all ends of the flashing base overlap.
Step 5
For each corner: Install a JM PVC Universal Corner welded to the
membrane base flashing with
a continuous 1 (2.54 cm) minimum heat weld. Care must be taken
to leave an unwelded area at the center of the corner to allow for
movement.
Note: The JM PVC Universal Corner should extend a minimum 2
(5.08 cm) beyond the opening at the top and bottom of the canted
curb. In some instances one corner may not cover both openings.
Probe and check all seams.
JM PVC Membrane Canted Base Curb Flashing
Step 1
On two opposite sides of the curb: Install JM PVC Membrane Base
Flashing extending vertically 8 (20.32 cm) minimum,
leaving enou