STURDY-DEK^® Asphaltic Cover Board for Siplast modified bitumen systems is designed to protect the roofing assembly and provide a uniform substrate for Paradiene^® membranes. The asphaltic panel consists of a core, faced with two asphalt-saturated fiberglass liners. Siplast’s Paradiene^® membranes may be cold applied or torched directly to the STURDY-DEK^® Asphaltic Cover Board, providing a compatible and durable modified bitumen substrate for your roofing system. Upon torching or applying cold adhesive STURDY-DEK^® Asphaltic Cover Board becomes a key component of the roof membrane, reinforcing its strength and improving its resistance to punctures.* Available in 4’ x 4’, 4’ x 5’, and 4' x 8' sheets in 0.125" (1/8") and 0.25" (1/4") nominal thicknesses.