What is a heat resistant plaster and where is it used?
A heat resistant plaster is a plaster that has been specifically designed to withstand high temperatures. It can withstand temperatures over 50 degrees centigrade. It is ideal for use on walls, chimney breasts and other areas surrounding an open fireplace, stove and range cookers. At temperatures over 50 degrees centigrade, the commonly used gypsum plaster hardens and cracks and becomes ineffective in retarding heat.
How to use a heat resistant plaster?
The powdered material is mixed with the right amount of water to achieve a floating consistency. It is best to use a mixer drill to mix the powder with the water. This will prevent formation of lumps which is likely when it is mixed manually by hand. This substance can then be applied on the walls or areas that are subjected to intense or extreme heat conditions.
However, it is best to apply vitcas heat resistant plaster on a layer of heat proof screed.
Heat proof screed provides a rendering to the building blocks, used in construction of the fireplace, and protects them from heat. For example bricks, breeze block, stone or other materials susceptible to damage due to exposure to intense heat. It can withstand temperature around 1400 degree centigrade. The heat proof screed is a dry powder, which is similar to cement. It needs to be mixed with cold water to achieve a floating consistency. When applied, the screed will give maximum support to the construction material like the bricks and stone. A coating thickness of 12.5mm to 25 mm is ideal for most domestic applications. The layer of screed needs to be cured for 24 hours and dried for at least 48 – 72 hours before it is subjected to heat. Adequate curing and drying of screed will ensure its effectiveness and will aid in applying the heat resistant plaster uniformly on the walls.
After the screed has dried, the heat resistant plaster needs to be applied. A thickness of 5 mm to 13 mm is ideal for most applications. Adequate care needs to be taken to ensure that there are no lumps and that the plaster has been applied uniformly. It needs to be naturally dried for at least 3 days. After the moisture has cleared, the area is ready to be subjected to intense heat conditions.
However, for the heat resistant plaster to be effective it must be applied at a specified distance from the fireplace. These specifications will be provided on the labels by suppliers.
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Further information about Heat Resistant Plaster can be found on the Heat Resistant Plaster manufacturer's website.
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