Meir Roofing

A naturally occurring volcanic rock formed when cooling molten magna comes into contact with water and which causes powdered Perlite to expand some 20 times when heated. During manufacture, the Perlite is combined with mineral fibres and binders to produce a roof board that is incombustible, thermally insulating, have a good compressive strength but low laminar strength, are rather brittle, whilst being ecologically friendly and resists decay but the absorption of moisture can cause significant loss of strength chemically neutral and rot proof.One surface of Perlite board is usually treated during manufacture with a bitumen emulsion to increase resistance to bitumen absorption and bind the surface. They have a very low coefficient of thermal expansion and will accept fully bonded waterproofing systems. Because of the dimensional stability and heat shielding qualities it often used to improve the performance of other insulants such as polystyrene, rigid urethane or phenolic either as an on site overlay to these materials or fully bonded composite form with a minimum 25mm thickness being recommended. It is used extensively where fire protection or high compressive strength is required.