Required Thickness Coverboard Roof

5 8 thickness meets the requirements of type x per astm c 1177.

Required thickness coverboard roof.

Flame spread index of 75 and smoke development 450 meet code requirements for foam plastic roof insulation. Coated fiberglass facer ideal for fully adhered systems provides a broader compatibility and higher performance with roofing adhesives. Physical properties listed above are presented as typical average values as determined by accepted astm test methods and are subject to normal manufacturing. Densdeck roof boards are fm tested and approved as the only 1 2 gypsum product to meet the calorimeter requirements for conventionally insulated decks.

The cover board also serves as a substrate for a vapor retarder in this application. Dens deck provides an excellent substrate for all types of conventional low slope roofing membranes particularly in fully adhered assemblies. The material is durable and provides superior impact and puncture resistance. Codes exempt foam plastic insulation when used in fm 4450 or ul 1256.

The boards are manufactured in standard sizes of 4 feet by 8 feet and an average thickness of 3 8 inch. Over the roof deck. Tested in accordance with astm e84 its surface burning characteristics are flame spread 0 and smoke developed 0. In this application the cover board provides a fire barrier in the case of an internal fire.

Meets the requirements of astm c 1177. This significantly increases the time required to melt the insulation which adds fuel to the flames.