scope:

This standard applies to all rigid photovoltaic module systems intended to be 1) mechanically fastened through or attached to an FM Approved single-ply, polymer-modified bitumen sheet, built-up roof, liquid applied roof cover or steep slope roof (mechanically attached only), 2) mechanically fastened to a metal panel roof cover assembly using clamps or other types of fasteners or 3) loose laid and ballasted over an FM Approved fully adhered single-ply, polymer-modified bitumen sheet or built-up roof cover assembly.

This standard also applies to panels secured to racks and/or rack framing which are independently secured to the building structure, roof deck or metal roof cover or ballasted. It also applies to the rack itself and its securement.

This standard evaluates rigid roof-mounted photovoltaic module systems as part of a finished roof assembly for their performance in regard to fire from above the structural deck, simulated wind uplift, susceptibility from hail damage, seismic performance requirements and gravity load resistance. The standard is intended to evaluate only those hazards investigated and is not intended to determine suitability for the end use of a product.

Single-ply, polymer-modified bitumen sheet, build-up roof and liquid applied roof cover systems used with rigid photovoltaic modules shall be qualified in accordance with FM Approval Standard 4470. Metal panel roofs used with rigid photovoltaic modules shall be qualified in accordance with FM Approval Standard 4471. Steep slope roofs used with rigid photovoltaic modules shall be qualified in accordance with FM Approval Standard 4475.

This standard only addresses the photovoltaic module system and does not address any other electrical component utilized to supply the generated electrical power to the facility.

This standard does not qualify flexible photovoltaic modules. Flexible photovoltaic systems are evaluated per FM Approval Standard 4476.

Purpose

This standard states Approval requirements for rigid photovoltaic modules that are installed with an FM Approved roof assembly.