Plaster

COMPONENTS

Blend of clay, fine aggregate and organic fibres that is supplied as a dry powder. It has an indefinite shelf life if stored dry and requires only mixing with clean water to be ready for use. It hardens by drying – no chemical reaction takes place – and so remains workable for a long time and can be re-worked by the addition of water at any time.

Practical alternative to using gypsum or lime plasters and is compatible with ‘breathing’ construction in historic and new buildings.

DENSITY

1500 kg/m3

THERMAL CONDUCTIVITY (K)

0.66 W/mK

RESISTANCE TO MOISTURE

The plaster will deteriorate if applied onto damp backgrounds or if used unprotected in damp environments. Careful attention to detail is required in kitchens, bathrooms, shower areas, etc.

RESISTANCE TO FIRE

Clay plaster is non-combustible

DRYING

Drying times vary considerably with the ambient conditions, applied thickness and the suction of the background. In ideal conditions, a 15mm thick topcoat will be dry after 3-4 days

To encourage controlled drying, ensure plastered areas are well ventilated Excess heat or forced ventilation may cause cracking. If cracking occurs, the affected area can be wetted and re-trowelled

Each coat should be allowed to dry before applying further coats.

References

Singapore Standard; CP 56: 1991, Code of practice for Internal Plastering; Singapore Institute of Standard and Industrial Research, Singapore; 1991.