Lafarge Gypsum offers a flexible range of quality ceiling board solutions.

Lafarge Gypsum offers a flexible range of standardised components to ensure the quick and practical installation of its ceiling boards – whether a suspended or flush plaster ceiling.

Suspended ceilings
Suspended ceilings are used primarily in commercial buildings to conceal unsightly services or untidy structural elements. The on-site assembly of the ceiling system is straightforward and seamless with minimal wastage. Some of the components just clip together.

Ceiling heights can be varied to accommodate services and ducting, while performance specifications are met by selecting the appropriate grade of plasterboard and insulation. This system can achieve up to 120 minutes of fire resistance and 72dB of sound insulation.

Flush plaster ceilings
Lafarge Gypsum’s flush plaster ceilings are perfect for overcoming uneven ceilings in new buildings, as well as refurbishment projects. This simple ceiling solution uses a connector which is fixed to the sides of the timber joists and a gridlock channel that clips onto the connector. The Lafarge plasterboard is screw-fixed to the channels.

Plasterboard ceilings on timber framing are primarily used for residential applications, providing a smooth finish for direct decoration. A textured finish can also be achieved, serving as a base for skimming plaster. The plasterboard is attached directly to the underside of the floor joists or to the bottom chords of the roof trusses.

Installation
The Lafarge Gypsum standard residential ceiling comprises of 6,4mm plasterboard and H-strips, while the flush plaster ceiling system uses 9mm plasterboard and steel brandering.

Lafarge plasterboard must always be fixed with the length of the board at right angles to the brandering, attaching the plasterboard from the centre outwards. The gap between the boards should not exceed 2mm.

Taper-edged Lafarge plasterboard should also be fixed at right angles to the brandering to ensure that the butt joints fall on a brander. The board should be fixed at 150mm centres.

It is recommended that flush-jointed 9mm and 12mm ceiling boards have a first coat of quality PVA emulsion-based paint before a final coat of household paint is applied.

Cornice details
The Lafarge cove cornice consists of a gypsum plaster core encased in paper and is designed to use at the angle between the wall and ceiling. The cove cornices are available in lengths of 2,7m, 3m, 3,6m and 4,2m; with a width of 75mm.

The cove cornices enjoy the same fire protection as Lafarge plasterboard. For maximum acoustic performance, cornices can be used for sealing air paths around ceiling perimeters to help maintain sound insulation performance from room-to-room. Lafarge cove cornices are durable and have the same life expectancy of the house or building under normal conditions. If there is excess movement of the roof structure, the cornice should be fixed to the wall only.

Lafarge Gypsum
Tel: (011) 657 0000 / 1000
Fax: (011) 657 1092
Website: www.lafarge.co.za