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● Choice of framing sizes to suit range of
performance requirements
● Produces seamless surface ready
for decoration
● Choice of jointing materials to suit
user preference
● Mechanically applied materials ideal for
larger areas
● Ready-mixed or dry powder options
Key facts
Jointing materials
Gyproc jointing materials produce a smooth, continuous,
crack-resistant lining surface ready for priming and final
decoration. A number of jointing specifications are
available to suit the board type, site preference and
method of application - manually using hand tools or
mechanically using Gyproc Speed Tape tools. After joint
treatment has dried, the complete lining surface is treated
with Gyproc Drywall Primer to prepare it for application of
paint or wall coverings. Gyproc Drywall Sealer can be used
in two coats to provide water vapour control.
Tapered edge plasterboard
Gyproc Paper Joint Tape
Gyproc jointing materials
Gyproc Drywall Primer or Gyproc Sealer
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2
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Sector Guide
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Stage 1 Stage2 Stage 3
(Gyproc Paper Joint Tape & Bulk Fill) (Secondary Fill)
(Finishing Coat)
Air-dryingJointing compounds used for the finishing application,
by theirvery nature, are applied more thinly than fillers and so
musthave air-drying characteristics in order to harden sufficiently
atfeathered edges. Air drying materials can be applied by handor
machine using Gyproc Speed Tape tools. Air drying materialsmay be
used as fillers but greater time needs to be allowed topermit the
material to dry in depth, particularly in coldconditions.
Air-drying materials should not be used for fixingcorner tapes or
beads.
Air drying versus setting
SettingJointing compounds used for the joint filling stage(s)
areusually setting products. Hardening is not dependent
uponatmospheric humidity. Fillers that only harden by thesetting
process are hand applied and have low shrinkage.When a setting
product is applied as a thin layer it may ‘dry-out’ before it has
properly hardened. Setting materials aretherefore unsuitable for
the finishing application.
Table 2 - Jointing Product combinations1
Table 1 - Jointing
Product name Hardening Fill Finish
characteristics stage(s) stage(s)
Gyproc Joint Filler, 25kg bag Setting ✔ -
Gyproc ProFill, 12.5kg bag Setting ✔ -
Gyproc ProMix Finish, 3ltr and 15ltr tubs Air-drying ✔ ✔
Gyproc ProMix All Purpose, 3ltr and 15ltr tubs Air-drying ✔
✔
1 A setting material should never be applied on top of an
air-drying material. Air-drying materials shrink as they dry which
may cause a jointto delaminate under such circumstances.
Gyproc ProMix FinishGyproc ProMix All Purpose
Gyproc Joint Filler,Gyproc ProFill
Gyproc Joint Filler,Gyproc ProFill
Gyproc ProMix FinishGyproc ProMix All Purpose
Gyproc ProMix FinishGyproc ProMix All Purpose
Gyproc Joint filler,Gyproc ProFill
Gyproc ProMix FinishGyproc ProMix All Purpose
Gyproc ProMix FinishGyproc ProMix All Purpose
Gyproc ProMix FinishGyproc ProMix All Purpose
Setting
Air-drying
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Gyproc board products
Gyproc Joint Filler
For seamless plasterboard joints and angles.
Bag weight 25kg
Shelf life 12 weeks
Gyproc ProMix Finish (Lite) - Readymix Filler
& Finishing Compound
For seamless plasterboard joints and angles.
Tub contents 3litre; 15 litre
Shelf life 24 weeks
Gyproc ProMix All Purpose Jointing
Compound (Semi-lite)
For seamless plasterboard joints and angles.
Tub contents 3litre; 15 litre
Shelf life 24 weeks
Gyproc ProFill
For seamless plasterboard joints and angles.
Bag weight 12.5kg
Shelf life 12 weeks
Fixing and finishing products
Gyproc Paper Joint Tape
For reinforcing plasterboard joints and
internal angles.
Gyproc Corner Tape
For reinforcing external, inc. splayed, angles.
Gyproc Drywall Metal Angle Bead
For external angle reinforcement.
Gyproc Drywall Archbead
For arch reinforcement.
Gyproc No Coat
Gyproc Drywall Metal Edge Bead
Forms a defined edge to plasterboard areas.
Thickness 9.5, 12.5 or 15mm
Gyproc Drywall Plastic Edge Bead
Forms a defined edge to plasterboard areas.
Dimensions 12.5 x 3000mm
Thickness 12.5
Gyproc Superbead 100 and 200
For fast, precise corner reinforcement.
Gyproc Control Joint
For providing an allowance for movement up
to 7mm.
BGM105 Edge Reveal
Width 25mm Depth 10mm
BGM106 Edge Reveal
Width 12.5mm Depth 10mm
BGM119 Edge Stop
Width – Depth 12.5mm
Gyproc Drywall Primer
Used to prepare for painting.
Tub contents 10 litre
Gyproc Drywall Sealer
Used to provide vapour control.
Tub contents 10 litre
Gyproc drywall tools
A range of hand tools and Gyproc Speed Tape
mechanical jointing tools and equipment.
Health and SafetySafety Data Sheets for all Gypsum Industries’
products areavailable to download from our website:
www.gypsum.ie,or via the Technical Sales Department.
COMPONENTS
OR
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INSTALLATION OVERVIEW -
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EnvironmentalGyproc jointing materials are unsuitable for use in
areassubject to continuously damp or humid conditions.
Preparation1. Boards should be securely fixed, with no steps
betweenadjacent boards.
2. The correct fixings must be used and properly located
withtheir heads just below the liner surface. Any protrudingscrew
heads should be driven home using a hand screwdriverprior to
spotting and jointing.
3. Jointing materials should not be applied to frozen
surfacesand should not be used at, or subjected to,
temperaturesbelow 4ºC during setting or hardening.
Joint reinforcementIn a plasterboard system, suitable joint
reinforcement isessential to minimise the risk of cracking along
the joints,which then appears through the decoration. To achieve
theobjective of a smooth continuous crack-free surface, taperededge
plasterboard and Gyproc Paper Joint Tape are widelyregarded as best
practice when jointing or plastering. Thetapered edges provide a
recess for the joint treatment soallowing a flat, finished surface.
At board joints, where cutedges or square edge boards occur, the
joint treatment isinevitably raised above the board surface and is
more difficultto conceal. In this situation the second and third
stages arecarried out using a Gyproc finishing product and
jointtreatment is feathered-out into the field of the board in
orderto conceal the joint as much as possible.
Joint treatment has two essential components - thereinforcement
and the jointing compound. Reinforcement isnecessary where there is
relative movement of adjacentboards. In practice movement of the
background structure ispossible and Gyproc Paper Joint Tape bedded
into a jointingcompound is recommended for the best crack
resistance.
Self-adhesive fibre tapes are an alternative, and can be easyand
quick to install on flat joints. They are not, however, adirect
substitute for Gyproc Paper Joint Tape, as tests haveshown that
Gyproc Paper Joint Tape provides superiorresistance to
cracking.
In fire-rated applications Gyproc Paper Joint Tape must
beused.
FillingTapered Edge Joints1. A continuous thin band of Gyproc
joint filling materialshould be applied to the trough of the
tapered edge joints,making sure that no area is left uncovered. The
requiredlength of Gyproc Paper Joint Tape should be pressed into
theband of filler. The tape should be firmly bedded withsufficient
joint filler under the tape to ensure good adhesion.The filler
should be brought flush with the surface of theplasterboard.
2. Immediately after the filler has set, or dried out fully,
asecond layer of filler should be applied over it. This shouldalso
be brought flush with the surface of the board.
3. Once the second application of jointing material has set oris
fully dried out, apply a finishing coat of ProMix Filler
&Finish. The finish coat should be feathered out into the
fieldof the plasterboard.
At all stages, any surplus material should be wiped from
theedges of the joint with a moistened joint sponge, taking carenot
to disturb the main joint material.
Square Edge Joints1. A continuous thin band of Gyproc joint
filling materialshould be applied over the joint, making sure that
no area isleft uncovered. The required length of Gyproc Paper
JointTape should be pressed into the band of filler. The tapeshould
be firmly bedded with sufficient joint filler under thetape to
ensure good adhesion. Apply a 200mm widecontinuous band of Gyproc
joint filling material along bothedges of the bedded Gyproc Paper
Joint Tape.
2. When the first application of jointing material has set or
isfully dried out, apply a second application of Gyproc
jointfilling material. This coat should be applied at 250mm
widealong both edges of the Gyproc Paper Joint Tape.
3. Once the second application of jointing material has set oris
fully dried out, apply a finishing coat of ProMix Filler
&Finish. The finish coat should be feathered out into the
fieldof the plasterboard.
At all stages, any surplus material should be wiped from
theedges of the joint with a moistened joint sponge, taking carenot
to disturb the main joint material.
Nail / Screw Head SpottingThe indentation should be filled with
a layer of Gyproc jointfilling material struck off level with the
face of the board andallowed to set. After a second application of
filler, the processis completed with an application of ProMix
Filler& Finish.
Gyproc Drywall Primer and Drywall SealerSpecially formulated for
use on the surface for directdecoration of plasterboard. Applied in
one application, afterthe jointing has dried, by brush or roller,
it prepares thesurface for paint and wallpaper decoration.
Forpaperhanging it allows the paper to be wet-stripped
whenredecorating. For painting it primes, providing a
consistentbackground for the first coat. Where a vapour check
isrequired two coats of Gyproc Drywall Sealer can be used as
analternative to the Primer. A water vapour resistance of atleast
15MNs/g is achieved.
Jointing Process
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The Primer should be applied as soon as possible after
boardfixing is completed, particularly when decoration will
bedelayed.
Coverage:Gyproc Drywall Primer:Approx.: 150m2/10 litres
Gyproc Drywall SealerApprox.: 80-90m2/10 litres for a two coat
application
130m2 for a one coat application
Supplied in 10 litre containers
Cut edges
A similar finish to that obtained with tapered-edge boardscan be
obtained with cut-edge boards or a cut-edge andtapered-edge board.
The cut edges should be lightly sandedto remove any paper burrs.
The joint should be filled flushwith the face of the board using a
Gyproc joint filler and allthe stages of jointing carried out as
outlined above.
Angle Reinforcement
Internal anglesGaps between the boards should be filled with a
Gyprocjoint filler. A thin layer of filler should be applied to
bothsides of the angle. The joint tape should be folded andpressed
into the angle, making sure that air bubbles areremoved. At this
stage, the tape on both sides of the angleshould be covered by a
layer of filler. Sufficient joint fillershould be left behind the
tape to ensure good adhesion,and feathered out with the jointing
sponge. Surplusmaterial should be removed with the sponge. When
thiscoat has dried a Gyproc joint finishing material should
beapplied to both sides of the angle and the edges featheredout
with the jointing sponge.
When the internal angles are formed at the junction ofwallboard
and plastered walls or ceilings, the abovetreatment should be
carried out but it may be necessary toapply a narrow band of pva
sealer to the plastered surfacesbefore applying joint filler.
External anglesWhen external angles are formed, any cut edges
should bemasked by a bound edge. If two cut edges occur
together,the exposed edges should be given a brush coat of
pvasealer. External angles should be reinforced with eitherGyproc
Corner Tape or Gyproc Angle Bead.
Gyproc Corner TapeThe tape should be cut to the length required
and creasedfirmly at the angles to allow the steel strips to lie
close tothe wallboard surfaces.
A 50mm wide band of Gyproc Joint Filler or Gyproc ProFillshould
be applied to each side of the angle. The tapeshould be pressed
firmly on the corner, making sure thatthe arris of the folded tape
is straight. Immediately afterbedding the tape, a 100mm to 125mm
band of Gyproc JointFiller or Gyproc ProFill should be applied to
both sides ofthe angle with the applicator. The edges should
befeathered out with a moist sponge. After this coat of fillerhas
set, a layer of finish should be applied and the edgesagain
feathered out with the jointing sponge.
Gyproc Angle BeadWhen maximum protection is required for the
externalangle, Gyproc Drywall Metal Angle Bead should be used.25mm
bands of Gyproc Joint Filler or Gyproc ProFill shouldbe applied to
both sides of the angle formed by thewallboard. The angle bead
should be positioned on thejoint filler with its wider flange
covering the joint betweenthe wallboards. It should be pressed
firmly into place withthe outer edges touching the wallboard
surface. Materialwhich has been squeezed through the holes and at
thesides should be struck off flush and the remainder allowedto
set. At this stage, the angle bead will tend to move ifmore joint
filler is applied. If necessary one or twomechanical fixings may be
used to ensure that the bead isnot dislodged while the filler is
setting. The nails should beremoved after the filler has set.
When the joint filler has set, another layer should beapplied
and feathered out. The surplus material should beremoved with the
sponge. After this layer of joint filler hasset, a coat of finish
should be applied to each side of theangle, 50mm beyond the edge of
the joint filler.
Plan of external angle showingposition of Gyproc Corner Tape
Plan of internal angle showingposition of Jointing Tape
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