The Perlite Insulating Concrete roof deck system is ideal for built-up, single-ply roofing systems and re-roofing applications. Compared to other roof insulation systems it has superior wind and fire resistance. For re-roofing applications, Perlite provides a cost-effective, slope-to-drain design with high R-values over flat and often irregular substrates that are commonly found in re-roofing systems. The Perlite roof deck insulation systems have been tested and approved for wind and fire ratings by Underwriters Laboratories, Factory Mutual and other code authorities.