scope:

This standard sets performance requirements for lightweight insulating concrete when used in roof deck constructions. This standard examines the ability of lightweight insulating concrete to limit fire spread and resist wind forces.

In addition to the requirements specified in this standard, the components above the lightweight insulating concrete (e.g. roof covers, base sheets, fasteners) shall meet the requirements of the Approval Standard 4470-Single-Ply, Polymer-Modified Bitumen Sheet, Built-Up Roof (BUR) and Liquid Applied Roof Systems for use in Class 1 and Noncombustible Roof Deck Construction.

This standard is intended to verify that the product as described will meet the stated conditions of performance and quality, useful to determine the suitability for end-use conditions of these products.

The requirements of this standard shall be used to measure and describe the performance of lightweight insulating concrete in response to exposure from fire and wind, under controlled laboratory conditions. The results of these controlled exposures shall not be used to describe or appraise actual exposure conditions, since such conditions vary widely.

The Approval program includes fire, wind uplift, corrosion, and other tests as noted. A complete review of construction and application specifications shall be conducted to assure, as far as possible, a practical and reliable installation. Inspection of the product manufacturing facility and of at least one field installation, at the discretion of FM Approvals, shall be conducted to assure conformance with the required tests and specifications.

Purpose

This standard states Approval requirements for classification of lightweight insulating concrete when used in roof deck constructions. FM Approved lightweight insulating concretes are those that meet the criteria of this standard for combustibility and wind resistance.

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