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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