scope:

Cementitious panel roof deck components, incorporated in a complete roof deck assembly, which exhibit low fire spread below the deck, adequate simulated wind uplift resistance, minimum heat damage potential and adequate strength during the Approval examination will qualify as a Class 1 assembly.

This standard applies to any component intended for use as a cementitious panel roof deck. Weatherability is not a part of the Approval evaluation. Roof cover performance is evaluated in accordance with FM Approval Standard for Class 1 Roof Covers (4470), Class 1 Panel Roofs (4471) or Class 1 Steep Slope Roof Covers (4475).

The performance of a cementitious panel roof deck depends in part on all components in the roof system makeup, and on how they interact. It is therefore necessary to evaluate the roof assembly as a whole when measuring the fire spread potential on the underside of the roof and its windstorm resistance classification.

This standard is intended to evaluate only those hazards investigated, and is not intended to determine suitability for the end use of a product.

Purpose

This standard states Approval requirements for cementitious panels for use as roof decking in Class 1 insulated roof construction.

Approval criteria may include, but are not limited to, performance requirements, marking requirements, examination of manufacturing facility(ies), audit of quality assurance procedures, and an Audit program.