scope:

This standard applies to all vegetative roof systems that are intended to be installed over an FM Approved single-ply, polymer-modified bitumen sheet, built-up roof or liquid applied roof cover assembly.

The roof cover assembly, over which the vegetative roof system is installed, shall meet the requirements of 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 Constructions), with the exception of UV conditioning, susceptibility from hail storm damage, and performance in regard to fire from above the deck.

Any portion of the Single-ply, Polymer-Modified Bitumen Sheet, Built-Up Roof, and Liquid Applied roof cover systems that is not covered by the vegetative roof system (for example - vertical flashing at a parapet wall, where the membrane extends above the growth media) shall be qualified in accordance with all requirements of Approval Standard 4470.

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

This standard evaluates vegetative roof systems for their performance in regard to fire from above and below the structural deck, foot traffic and water leakage.

Purpose

This standard states Approval requirements for vegetative roof systems that are used within an FM Approved roof assembly.