scope:

Insulated steel deck roof components, incorporated in a complete insulated steel deck roof assembly(s), 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 I assembly.

This standard applies to the assembling of an insulated steel deck. Weatherability is not a part of the Approval evaluation. Roof cover performance is evaluated in accordance with Factory Mutual Research Approval Standard for Class I Roof Covers (4470). Steel deck performance is qualified by Factory Mutual Research Approval Standard for Steel Deck (4451).

The performance of an insulated steel deck roof 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 potential for fire spread on the underside of the roof, and/or 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 Factory Mutual Research requirements for Approval of Class I - Insulated steel roof decks. A Class I insulated steel roof deck is one which meets the criteria of this standard for fire, wind uplift, live load resistances, corrosion of metal parts, and fatigue of plastic parts. The Standard applies to all components as assembled in the system below the roof cover. The roof cover is tested in accordance with Factory Mutual Research Approval Standard 4470.