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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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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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