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2008 Copyright Reflective Insulation Manufacturers Association International
The
Reflective Insulation ManufacturersAssociation International
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Benefits of ReflectiveInsulation, Radiant
Barriers and IRCCs
Presented on Behalf of
RIMA International
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Learning Objectives
Identify what reflective products areavailable, how they work and are installed
Review thermal performance in a buildingenvelope
Discuss Energy Code compliance, EnergyStar compliance and Federal Energy Taxcredits as they apply to reflective products
Understand how radiant barriers affect theHERS index
Examine green building attributes (LEED andNAHB Model Green Guidelines)
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RIMA-I MembersPlatinum
Members Astro-
Foil/InnovativeEnergy
Covertech
KdB Isolation SA RoyOMartin
Reflectix Inc
TVM BuildingProducts
Advanced Technology
Air-Cell Innovations Pty LtdAstro Reflective Insulation AS
Celplast Metallized Products
Cleveland Laminating Corp
Compac Corporation
Dunmore CorporationDuPont Tyvek
ESP/Low-E
Fi-Foil Company
Foil Barrier Insulation
Heartland Insulation SupplyIdeal Tape Company Inc
Innovative Energy, California
Innovative Insulation Inc.
Insulation Solutions, Inc.
Isolant S.A.LIT Works Co.
Louisiana Pacific
Midwest Low-EMWI Components
Polyair
Polyon Barkai Ind.
Prodex
PT Insfoil PradanasaktiRadiant Barrier Specialists
Radiant Guard
Resisto, a Div. of Soprema
STS Coatings
San Miguel Woven ProductSigma Technologies Intl
Solec
Valeron Strength Films
Venture Tape Corp
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Overview
Definitions & Standards
Types and Applications
Insulation & Building Science
Codes, National Accrediation,GreenQ&A
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Types of Products
Reflective Insulation
Radiant Barriers
Low-e Spray Coatings
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Definitions Reflective Insulation: one or more low
emittance materials (0.10 or less) installedadjacent to air spaces in an enclosed air space.
The low emittance surfaces reduce radiationacross the air space. The layer(s) reducesradiant heat and convective heat transfer
Reference Documents for Reflective
Insulation: ASTM C1224 - Standard Specification
ASTM C727 - Installation
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Examples of Reflective Insulation Applications
R-Values apply
Floor or Crawl Space
Enclosed Cavity
Commercial Ceiling
Metal Furring & Drywall
(not pictured) Creates
Enclosed Cavity
Masonry
Walls
Metal
Buildings
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Definitions Radiant Barriers: one or more low emittance
materials (0.10 or less) installed adjacent tolarge open air spaces. The primary function of
the low emittance surface(s) is to reduceradiation across the air space.
Reference Documents for ReflectiveInsulation:
ASTM C1313 - Standard Specification
ASTM C1158 - Installation
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Examples of Radiant Barrier Applications
Draped Method
Bottom of Roof
Rafter - Method
Deck Applied Method
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Low-Emittance
Products
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Definition of an IRCC
An Interior Radiation Control Coating is a non-thickness dependent, low emittance coating. Whenapplied to non-porousbuilding materialssuch as plywood,
OSB, metal sidingor plasterboard,according to themanufacturersInstallation
instruction,it lowers the normalsurface emittance ofthese materials to
0.24 or lower.
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An IRCC System
A building constructionconsisting of a low-emittance surface boundedby an open air space. AnIRCC is used for the sole
purpose of limiting heattransfer by radiation and isnot specifically intended toreduce heat transfer byconvection or conduction. (ASTM C 1321, section 3.2.3)
Thus, an IRCCS is similar to a Radiant Barrier System(RBS) but is somewhat less efficient due to its higheremissivity and is comprised of a coating on a buildingsurface, not a foil or film product.
IRCCS Spray-applied to underside of steel roof decking
and trusses in an ice hockey arena.
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Advantages of an IRCC
An IRCC is normally applied using airlessspray equipment, resulting in very low laborcosts and greatly reduced installation times.
Also, a water based IRCC can be safelyinstalled in existing structures where thecosts of installing foil or film products maybe prohibitive or impractical. An IRCC may
also be used in many manufacturedproducts (such as infrared heat reflectors ofautomotive parts) where it is impractical toadhere foil or film radiant barriers.
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Building Science
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Reflective Insulation
RI: An enclosed air space with a low-
emittance surface.
Radiation is suppressed
MI: An enclosed air space filled with
solid fibers.Convection is suppressed
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Radiation is Suppressed by aLow-emittance Surface
Key Words: emittance, reflectance
Opaque materials zero transmission
Reflectance: fraction n incident radiation that
is not absorbed.
Emittance: (actual rad.)/(blackbody rad.)
A blackbody absorbs all incident radiation.
approximated by carbon black
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Emissive Power (Radiation)
All surfaces above absolute temperaturegive off radiation.
Expressions for Heat Flux (Btu/ft2hr)
0.1713x10-8( T + 460 )4 for blackbody
E( 0.1713x10-8( T + 460 )4 ) for real surface
F12E( 0.1713x10-8(( T1 + 460 )
4- (( T2 + 460 )4
for net exchange
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Radiation from a Surface Increases as theTemperature of the Surfaces Increases
Total Emissive Power of a Blackbody
Surface
25
75
125
175
225
275
0 25 50 75 100 125 150 175
Temperature (F)
E
missivePower
(Btu/ft^2.h
)
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Net Exchange Between Large ParallelSurfaces
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Net Exchange between LargeParallel Surfaces
The Net Exchange for this arrangement
of surfaces is given by:
F12 = 1/( 1/e1 + 1/e2 1)e1 e2 F12
1.00 1.00 1.00
0.87 0.87 0.77
0.87 0.22 0.21 73%
0.87 0.03 0.03 96%
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Diagram from ASTM C 1340 AtticRadiation Terms Radiant Barrier Theory
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Results in the Attic
Attic Radiant Barrier Winter
1. Reduces radiation heat transfer from thesurface of the attic floor insulation to the roofdeck.
2. Increases the surface temperature of theattic floor insulation.
3. Reduces the temperature difference from
bottom of the insulation to top of theinsulation.
4. Reduces the heat flow out of the conditionedspace.
5. Solar gain will be reduced.
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Side View of Wall
Exterior l l Interior Enclosed Air Space100 F l l 70 F Large Parallel Surfaces
l l 3.5 Inches Across
l lHeat Flux
Total Cond Conv Rad E warm E cold
35.84 1.54 8.66 25.64 0.87 0.87
11.17 1.54 8.63 1.00 0.87 0.03
10.68 1.54 8.63 0.54 0.03 0.03
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Reduce Convection by ChangingGap Size
Wall Cavity as Before
Description R (1-D) Conventional Units
wood-wood 0.84wood-foil 2.69
foil-foil 2.81
wood-foil-wood 6.73Wood-foil-foil-wood 12.41
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Hybrid System Consisting of Polyurethane and aReflective System in the Enclosed Air SpaceNominal 2x6 Frame Wall
Wall Cavity R vs. R* of Foam
(Reflective Insulation System)
5
7.5
10
12.5
15
17.5
20
3 4 5 6 7
R-per-inch of Foam
WallCavityR 0.5 in.
1.0 in.
1.5 in.
2.0 in.
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Summary Statements
RIS, RB, and IRCC utilize surfaces with lowemittance and high reflectance to reduce heatflow.
Reflective air spaces are well understood with R-
values that can be measured and calculated.
RB have demonstrated savings that result fromreduced radiation transport and cooler attic air
spaces.
Hybrid systems can be tailored to provideexcellent systems with demonstrated thermalcharacteristic.
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Green
LEED or NAHB Guidelines
Reduce Energy Use Primary
Benefit
Materials and Resources
Regional Materials
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Green Building;is the practice of increasing theefficiency with which buildings use resourcesenergy, water and materials while reducing buildingimpacts on human health and the environment,through better siting, design, construction, operation,
maintenance, and removal the complete buildingcycle.Wikipedia
The greatest benefits of radiant barriers and reflectiveinsulation used in Green Building are energyefficiency and comfort for a calculable return oninvestment through Energy Efficient Design andenergy modeling.
Green Building
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Qualifying for LEED Certification
Energy and Atmosphere;Optimize Energy PerformanceReflective Insulation can be used as an option to (or) in conjunction with other Insulationto add R-Value.
Radiant Barriers help reduce radiant heat transfer and improve the performance of roofand ceiling insulation.
Materials and Resources;Building Reuse, Maintain 50% of Interior non-structural elementsReflective Insulation and Radiant Barriers could be left in place as part of the existingwall, roof, floor or ceiling system.
Materials ReuseReflective Insulation and Radiant Barriers could be removed during demolition andreused in new construction.
Indoor Environmental Quality;Thermal Comfort: DesignReflective Insulation and Radiant Barriers can be used to improve building envelopesperformance and increase thermal comfort since they reduce radiant heat transfer.
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Qualifying for ENERGY STAR and NAHB
Reflective insulation and radiant barriers help you
qualify for the HERS Index Requirements
(Energy Star Qualified Homes)
Radiant barriers help you qualify for Renewable
energy/solar heating and cooling Using passive
Cooling
(NAHB Model Green Home Building Guidelines)
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Energy Star Compliance
R-values or
Credits in Software Programs
Impact Ceiling Heat Flow & HVACDucts and Systems located inunconditioned areas
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2. Energy Star Compliance
In order to be considered an Energy StarCompliant Home there must be a home energyrating which involves an analysis of the homes
construction plans and onsite inspectionresulting in a HERS Index score.
HERS Index of85 in climate zones 1-5
HERS Index of80 in climate zones 6-8
Reference IECC 2006 for Climate Zones
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U d t di th HERS
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Understanding the HERSRating
What is the HERS Index?
The HERS Index is a scoring systemestablished by the Residential Energy Services
Network (RESNET) in which a home built tothe specifications of the HERS ReferenceHome (based on the 2006 InternationalEnergy Conservation Code) scores a HERSIndex of 100, while a net zero energy home
scores a HERS Index of 0. The lower ahomes HERS Index, the more energy efficientit is in comparison to the HERS ReferenceHome.
U d t di th HERS
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Understanding the HERSRating
A home energy rating involves an analysis of a homesconstruction plans and onsite inspections. Based on thehomes plans, the Home Energy Rater uses an energyefficiency software package to perform an energyanalysis of the homes design. This analysis yields aprojected, pre-construction HERS Index. Uponcompletion of the plan review, the rater will work withthe bulder to identify the energy efficiency improvements
needed to ensure the house will meet ENERGY STARperformance guidelines. The rater then conducts onsiteinspection, typically including a blower door test (to testthe leakiness of the house) and a duct test (to test the
leakiness of the ducts).
Eff f R di B i
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Effect of Radiant Barrier onHERS Index Score
Radiant Barrier adds 3HERS Points to Energy Star
Compliance
Model
Attic
Floor
Walls A/C RB HERS
Charlotte R-30 R-13 Seer 14 None 85
R-30 R-13 Seer 14 Yes 82
Miami R-30 R-13 Seer 14 None 89
R-30 R-13 Seer 14 Yes 86
Las Vegas R-30 R-13 Seer 14 None 82
R-30 R-13 Seer 14 Yes 79
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Federal Tax Credits
Commercial Buildings: Taxpayers can enjoy a deduction ofup to $1.80 per square foot for buildings that achieve a 50%reduction in annual energy costs related to heating, cooling,water heating and interior lighting - costs that are defined bythe ASHRAE standard.
New Homes: A credit of up to $2,000 is available to homebuilders who build homes projected - and demonstrated - tosave at least 50% of the heating and cooling energy of acomparable home that meets the standards of the 2004International Energy Conservation Code (IECC) Supplement.
Existing Homes: Current homeowners are eligible fordifferent tax credits based on a variety of energy-efficiencymeasures - such as improving insulation - with a $500 cap.
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Questions?
Reflective InsulationManufacturers Association International
(RIMA International)
800/279-4123
www.rimainternational.org