BGC Plasterboard recommends that this section should be read in conjunction with the architects’ specifications to determine the Level of Finishes.

BGC Plasterboard should be installed after all preceding trades have been completed.

Ceilings should be installed first. BGC Ceilingboard should preferably be fixed with their long edges perpendicular to the windows or light sources, to obviate unwanted light reflections across the joints.

For the walls, BGC Plasterboard sheets should be laid with their long edges horizontal, to minimise the number of joints as well as light reflections across the joints. This is most important when Finish Levels 4 or 5 are specified.

BGC Plasterboard may be cut by scoring the face side and snapping back away from the score. Then cut the paper on the second side following the original score line. Neat straight cuts can be made using a straight edge.

The cut edges should be sanded smooth to form clean joints.

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

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Roller/tilt door operation can result in differential movement due to vibration resulting in positive joint cracking and adhesive breakdown/failure.

While the finish and appearance of these areas remains the same as ceiling in habitable areas additional details are required.

BGC Plasterboard recommends the use of Water Resistant Plasterboard with 1/3 fixings.

• Screw and glue fix only.
• Back block all joints.
• Use of proprietary branded quality sealer prior to painting.
• Use wet area base coats in jointing system.

Eaves Details – Casing Bead

Timber Stop

If you choose not to install BGC products yourself, your local BGC Plasterboard Trade Centre can assist you to find a local contractor who will be able to assist.

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Back blocking is used to reinforce unsupported butt or recessed joints and must be positioned midway between supporting members, in ceilings and walls.

Back blocking must be used in open areas of ceilings (back of recessed joints) with 3 or more joints and where there is a likelihood of excessive shrinkage and movement in the structure.

If you choose not to install BGC products yourself, your local BGC Plasterboard Trade Centre can assist you to find a local contractor who will be able to assist.

If you choose to install BGC products yourself, ask our friendly staff for advice to get you started.

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Before lining the building it is prudent to consider the following design and construction issues:

• Consideration must be given to the framing, this may vary throughout Australia especially in high wind and coastal areas.
• It is highly recommended to batten out the ceiling with Rondo 16mm metal battens or 16mm Furring Channel or 28mm Furring Channel or equivalent.These are to be fixed on the appropriate direct fix clips.
• High-pressure differentials across a wall, may cause the wall to bend and move.
  Ensure that wall and ceiling areas do not exceed maximum allowable areas, heights or lengths, and provide movement and or relief control joints where necessary.
• Decoration is as important as the plasterboard installation and is vital in protecting both plasterboard and the set trowelled areas. The surface of the installed plasterboard ceiling should be decorated with an approved exterior grade paint. Please refer to your paint manufacturer for the appropriate grade required.

Alfresco Coffer Detail

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Paper tape joints produce stronger and more enduring results than those that are set with fibreglass tapes.

BGC Plasterboard recommends the use of paper tapes.

• Self-adhesive paper tapes should not be used.
• Where fibreglass tape joints are used, they must be back blocked before the joints are set (in accordance with the instructions set out in Back Blocking.

Tape & First Coat

Apply the BGC Base Coat bedding cement to fully fill the recess of the joint.

Centrally bed the perforated paper tape into bedding coat and remove any air bubbles. Apply additional cement and cover lightly with BGC Base Coat.

Stop-up all fixing points and apply BGC Base Coat to any damaged areas.

Allow the BGC Base Coat to set and dry for a minimum of 24 hours in damp or humid conditions or 1 hour for setting type cements (or as per compound manufacturer’s recommendation).

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Second Coat

Lightly sand the first coat.

Check the Level of Finish required in the architects’ specification, before applying the second coat as detailed in Plasterboard Finish Selection.

Apply a second coat of BGC Base Coat 180mm wide over the joints, making sure to feather out the edges.

Apply a second coat to all fasteners and damaged areas, feathering out by about 25mm.

Allow the second coat to set and dry for a minimum of 24 hours or 1 hour for setting type cements (or as per compound manufacturer’s recommendation).

Third Coat

Lightly sand the second coat.

Apply a thin finish coat of BGC Top Coat centrally over second coat, after it has set and hardened. Dampen the outer edges of the finish coat, with a sponge to feather out the BGC Top Coat about 280mm approx wide.

Apply a thin final coat of BGC Top Coat over all fasteners and damaged areas.

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Allow the BGC Top Coat to dry at least 24 hours.

Lightly sand smooth with 150 grit paper or with 220 sanding mesh.

Wipe off excess dust with a slightly damp cloth.

BGC Plasterboard will perform to the architects’ specification and the Australian Building Codes, provided all procedures are followed as per the compound manufacturers’ specification.

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.

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

If you choose to install BGC products yourself, ask our friendly staff for advice to get you started.

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BGC Plasterboard will perform to the architects’ specification and the Australian Building Codes, provided all procedures are followed as per the compound manufacturers’ specification.

Decoration

BGC Plasterboard does not recommend spray painting to achieve level 4 or higher finish. Ensure all stopping of joints and nail holes is completed to AS/NZ 2589:2007. Brush down area prior to painting to ensure board is free from sanding dust.

Roller apply a proprietary branded quality sealer, to the entire sheet area including joints, followed by two coats of full weight flat acrylic paint.

Choice of colour should be considered carefully – darker colours will exacerbate any defects and highlight any imperfections.

Where high humidity is of concern, ensure the chosen painting system will protect joints from moisture absorption.

Inner Corner & External Corner Details

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Clean down area where cornice is to be applied, remove any excess render or loose material.

Mark a guide line to suite the bottom edge of the cornice (90, 75 or 55 down) and pre-cut lengths as required.

All corner joints, internal and external, are to be mitred. Where butt joints are unavoidable, ensure both ends are prepared to align accurately.

Apply (butter) a 10mm bead of cornice cement to both long edges and ends of the cornice.

Locate cornice to guide lines and temporarily block as required.
Fill mitres, cleaning off excess cement as you go.

Remove temporary blocking after BGC Cornice Cement has set.

Apply second topping coat to mitres and joints as required.

Note: only ever butter one length at a time and install immediately.

Contact surface may require damping down prior to fixing cornice, depending on drying conditions.

Cove Cornice

BGC Plasterboard Cove Cornice is designed to give a clean continuous line at the junction of walls and ceilings, and can be used with confidence on both Plasterboard lining and cement plastered walls alike.

BGC Plasterboard Cove Cornice is made of a plaster core with paper face to complement BGC Plasterboard and Ceilingboard. Cove Cornice should be fixed using BGC Cornice Cement with few special tools required.

The use of a mitre box and hand saw for cutting internal and external corner mitres is recommended.

Decorative Cornice

The Decorative Cornice range from BGC Plasterboard adds the finishing touch to the interior décor of your new home or renovation.

Esperance provides a timeless design suiting many different styles of home. The soft undulation of the curve provides a stylish finish to any room.

For the bolder finish, don’t look any further than the Albany decorative cornice. With dramatic steps and bold curves, Albany creates an eye catching feature in a room.

Cove Cornice & Decorative Cornice Images

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