Control joints must be installed in walls and ceilings at a maximum spacing of 12m, or at control/ construction joints, whichever is the lesser.

Architectural features, openings, and the like may be used as control joint set out points.

Rondo ‘P35’ or MBS ‘PXJ-30’ are suitable control/expansion joints.

Control joints are centrally located across the 15mm minimum gap between adjacent BGC Plasterboard sheets, and the flanges nailed at 300mm centres to the framing behind.

Control joints should be set at twelve (12) metres maximum, or at construction joints, which ever is the lesser.

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Plasterboard Framing

Plasterboard Framing may be fixed to timber, CFS light steel framing or furring channels, which satisfy the BCA requirements and which have been plumbed true and straight.

Timber framing must comply with the requirement of AS1684 ‘National Timber Framing Code’ and AS1720.1&.2 ‘Timber Structures’ and have a moisture content less than 16% at time of lining.

CFS light-steel framing must be in accordance with AS/NZS4600 ‘Cold-Formed Steel Structure Code’, AS3623 ‘Domestic Metal Framing’ and AS1397.

BGC Plasterboard may be fixed to CFS steel framing not exceeding 1.25mm BMT. Framing members must have a 35mm minimum face width for nail fixing and 32mm for screw fixing.

Frames must be plumbed true and straight, to comply with the degree of finish required of the BGC Plasterboard.

The tolerance deviation over 1.8m spans, along and across members, for 90% of the wall and ceiling framing.

Steel Frame Application

BGC Plasterboard may be fixed to the framing with either adhesive and nails or adhesive and screws as appropriate.

Water-based acrylic gypsum plaster adhesives such as BGC Stud Adhesive, which comply with AS2753, are suitable for fixing BGC Plasterboard to both metal and timber framing.

Adhesive fixing is used in conjunction with fasteners, except for wet and tiled areas, fire-rated construction, over vapour-barriers or existing work, where mechanical fasteners, nails or screws only must be used.

The position of daubs of BGC Stud Adhesive ‘O’ and permanent fasteners ‘X’ should be as set out.

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Daubs of BGC Stud Adhesive, 25mm diameter x 15mm high are positioned in the pattern spaced at a maximum of 300mm and a minimum of 200mm.

BGC Stud Adhesive must not be used at wall-to-wall and wall-to-ceiling junctions, around openings, butt joints or fastener points. BGC Plasterboard is placed horizontally along each wall.

Sheets to be packed 6-10mm from floor and fastened along the top recessed edge at each stud or furring channel.

The sheets are then pressed firmly against the studs and temporary fastened midway across the sheet at every second stud or furring channel. Next, fasten the other recessed edge at each stud, or furring channel.

Fasteners must not coincide with BGC Stud Adhesive daubs, and fasteners should be kept to a minimum distance of 200mm from adhesive daubs. Fasteners around openings should be placed at a maximum spacing of 300mm centres. Allow at least 24 hours for the adhesive to set.

Timber Frame Application

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Ceiling Sheet Application or Interior Ceilings

BGC Stud Adhesive, 25mm dia. x 15mm high, are positioned in the pattern as shown in Table 4, spaced at maximum of 250mm and minimum of 200mm centres.

BGC Stud Adhesive must not be used at wall-to-wall and wall-to-ceiling junctions, around openings, butt joints or fastener points.

BGC Ceilingboards are placed at right angles to the ceiling joists, battens or furring channels, and fastened along one recessed edge at each joist, batten or furring channel.

Next, press the sheets firmly against the framing, and fix two nails (for timber framing) or one screw (for CFS steel framing), along the centre of the sheet at each framing member.

Then, fasten off the sheets along the other recessed edge, at each framing member. Fasteners must not coincide with BGC Stud Adhesive daubs, and fasteners should be kept to a minimum distance of 200mm from BGC Stud Adhesive daubs.

Where allowed, fasteners at butt joints and around openings should be placed at a maximum spacing of 150mm for nails and 200mm for screws.

Allow at least 24 hours or 48 hours in slow drying weather, for the BGC Stud Adhesive to cure.

Ceiling Sheet Application

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An exterior ceiling covers areas outside the main enclosed living area of a house such as entertainment areas (Alfresco), carports and garages.

The different environments of exterior ceilings are often severe and can be effected by:

• The generally constant high humidity,
• The climate of the region,
• Wind loads,
• Garage Roller Door Vibration,
• Insufficient perimeter support.

To overcome potential problems in these areas it is important to consider the following points:

• The correct choice and installation of lining materials,
• fasteners, jointing and coating materials, designed to suit the environments,
• Correct placement and installation of battens and installation methods,
• The design and detail of the structural components and their protection from moisture,
• Final paint decoration.

Condensation

Surface condensation and wind loads can be the main causes of lining board and jointing system failure. Insufficient protection can lead to the plasterboard distorting as well as potential mould attack.

Use sarking or foil backed insulation underneath metal roofing as metal is more susceptible to condensation build up than roofing tiles.

It is important that ceiling cavity areas are well ventilated to prevent condensation build up. The installation of eave and gable vents, roof ventilatiors etc. can assist in this by providing permanent cross flow ventilation.

Building materials and systems may be adversely affected by these severe environmental and physical conditions, which if not installed correctly can lead to ceiling failure and or collapse.

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For long runs of sheets and or large sheet areas, with set joints, movement control (expansion) joints must occur at maximum prescribed distances.

Generally, set joint areas should not exceed 20m², with a maximum distance of 3.6m across the sheets and a maximum of 5.4m along the sheets.

Plasterboard Materials

BGC 10mm and 13mm Water Resistant Plasterboard, 10mm Moisture Resistant Flameboard, 10mm Ceilingboard and 13mm Plasterboard may be used as suitable lining materials in exterior ceiling areas.

1/3 Fixing

For information about the complete range of fixings and metal products call your local Trade Centre or send an email directly to your local store using the ‘contact us’ page of the web site.

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