Perlite is a quality product used as roof insulation material under waterproofing systems having the properties of fire resistant, light weight, thermal insulation, high strength, noise absorption, non-toxic, inorganic, non-combustion, quick installation and economical .

The perlite ore is crushed, dried and graded. When perlite ore grains are abruptly subjected to immediate heat near to their softening point 930 ^o C the combined water rapidly vaporize causing them to expand 4 to 20 times their volume. The expansion process creates countless air voids in the grains which account for the lightweight insulating properties of Expanded Perlite. Because of these unique properties, perlite is used in the manufacture of masonry wall insulation, under floor insulation and roof deck insulation etc.

As thermal insulation, expanded perlite gives excellent results at temperatures ranging from very low to very high. Perlite concrete can be made with dry density of 340kg/m³. The lower the density the higher the insulating value.

The perlite can also be used in areas where the foam concrete operations are not practicable. Also covering perlite by sand cement slurry topping, provides a solid base for roofing system. It can also be laid to high slopes more than 1% which is a limitation with foam concrete.