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Home >
Boral Plasterboard >
Acoustic Wall Systems
ACOUSTIC WALL SYSTEMS
Install, Maintain :
FlexiBOARD™ |
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FlexiBOARD™
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Boral Plasterboard FlexiBOARD™ must be installed in accordance with the requirements of Australian Standard AS/NZS 2589.1:1997 - “Gypsum linings in residential and light commercial construction - Application and Finishing.” Wetting FlexiBOARD™ is only necessary to obtain extremely tight radii, or in situations where temperature and humidity are very low.
Fixing First Layer
Boral Plasterboard FlexiBOARD™ sheets can be curved horizontally or vertically, according to the application, framing and the degree of curve required.
It is important to note when installing FlexiBOARD™ on walls where a curve is required on both sides of the wall (double-sided) that the radius on the concave side of the wall will determine the radius and stud/frame spacing on the convex side.
FlexiBOARD™ may be applied to steel studs, timber framing or masonry substrate. When attached to masonry substrates, it should be fixed to Furring Channel for both concave and convex curves. Furring Channel spacing will depend on the radius required but may be reduced to prevent flat spots in curves of tight radii. For convex curves fasten FlexiBOARD™ to framing at 150mm centres at commencement of curved section and along first channel away from curve. (The first Furring Channel away from the curve should be 200mm minimum and 300mm maximum away from the commencement of the curve.) Screw fasteners are preferable to nails to minimise possible impact damage. Wetting FlexiBOARD™ is only necessary when extremely tight radii are required or when temperature and humidity conditions are low. When wetting the board, apply a small amount of clean water with a paint roller to the back of the board to be curved. Allow water to soak for 15 minutes before attempting to bend the board.
Fixing Second Layer
When fixing FlexiBOARD™ horizontally across framing or substrate, additional plasterboard layers should be staggered at least 200mm from the first layer to prevent butt joints.
Plasterboard joints on opposite sides of a partition, where possible, should not occur on the same stud or framing member.
Fasten FlexiBOARD™ to framing as for first layer, ensuring both layers in convex curves are fastened to framing at 150mm centres at commencement of curved section and along first channel away from curve. Fasten FlexiBOARD™ between 10mm and 16mm from sheet edges. Fasteners should be driven slightly below the surface of the plasterboard, taking care not to break the surface of the liner paper.
Walls and Ceilings
All butt joints should fall on framing members. Maximum stud spacing will depend upon radius required. Additional studs/framing members are used to achieve tighter radii. For ceilings in non-curved applications, the maximum support spacing is 300mm.
Finishing
Finish all joints and angles using any one of the approved Boral Plasterboard jointing and finishing compounds. For more information please refer to Boral Plasterboard Installation Reference Manual, Booklet 3 - Fixing to Steel Framing or Hotel and Motel Partition Wall Systems.
Transition From Curved Wall Into Flat Wall
Two layers of Boral Plasterboard’s 6.5mm FlexiBOARD™ used on a curved wall will join with a straight wall constructed using a single layer of Boral Plasterboard 13mm Standard Core board. In domestic applications where a single layer of 10mm Standard Core plasterboard is used, the straight wall (Standard Core) should be packed out to provide a neat join at the junction of the curved (2 x 6.5mm FlexiBOARDTM) and straight wall.
| Minimum Curving Radii for Boral Plasterboard FlexiBOARD™ |
| Application |
Sheets Installed Vertically |
Sheets Installed Horizontally |
| Min Radius |
Max stud spacing |
Min Radius |
Max stud spacing |
| Concave |
450mm
| 150mm
| 650mm
| 200mm
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| Convex |
250mm
| 125mm
| 450mm
| 200mm
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