Products / Toprock DD Plus

Toprock DD Plus is a dual-density, bitumen-coated stone wool roof insulation board for low-slope roofs, used as the substrate for torched, hot-mopped and self-adhered SBS or modified bitumen membranes, in fire-rated assemblies and where very severe hail (VSH) ratings apply. The product page prints R-3.8 per inch (ASTM C518) in 2 to 4.5 inch boards (R-7.6 to R-17.1), flame spread 0 and smoke developed 0 (ASTM E84), noncombustibility to ASTM E136 and CAN/ULC S114, a pass as noncombustible-core rated roof insulation under FM 4470, Class A under the roof-covering fire test CAN/ULC S107-03, Class 1 heat release under NFPA 276, and UL and ULC certification.