Heat Resistant Plaster is designed to plaster areas adjacent to heat sources only. It is not recommended for large areas such as complete walls and chimney breasts. This product is particularly effective when used in conjunction with Kos Heatproof Screed applied on-to brickwork.

Note: Both products Heatproof Screed and Heat Resistant Plaster are not designed to be used on insulation board.

TYPICAL APPLICATIONS

• Around the opening of cassette fireplaces (sometimes called hole in the wall fires).

• Adjacent to wood burning stoves and range cookers where the area of the wall is subjected to intense heat.

• It should only be used in the areas subject to intense heat i.e. 600mm above and 300mm along the side and bottom of the fire opening. The best results are obtained with a thickness of approx. 5mm.

CASSETTE FIRE OPENING SHOWING RECOMMENDED AREAS TO BE COVERED

Plaster edging strips can be used to define the area as shown. It is important that the mixing instructions are strictly adhered to (see label on bag). The area to be plastered should be first coated with a PVA adhesive. A thickness of approx 5mm should be applied. It is important that the plaster is applied evenly i.e. no featheredges. The surface finish must be obtained during flotation with the trowel. The material cannot be sanded when dry. Due to the surface being dense and non-porous when dry it is not suitable for finish skimming. Any minor cracks can be repaired in the normal manner as with gypsum plaster. When dry the finished surface forms a very hard heat resistant surface that can be painted over as required.

DRYING HEATPROOF SCREED It is very important to ensure that the Heatproof Screed is thoroughly dried prior to applying the Heat Resistant Plaster. The Heatproof Screed should be left to dry for at least 3 days, longer if moisture is still present. If possible apply heat after day one i.e. light fire or other heat source.

DRYING HEAT RESISTANT PLASTER HEAT RESISTANT PLASTER must be allowed to air dry for at least 3 days before lighting fire.

SECTION THROUGH WALL ABOVE CASSETTE FIRE OPENING