Fm Class 1 Roof Assembly

Versiflex pvc mechanically attached roofing system factory mutual fm approvals b.

Fm class 1 roof assembly.

As wind flows over the building the pressure directly above the surface of the roof decreases. Designed to help roofing professionals roofnav provides easy access to the most up to date fm approved roofing related information and related installation. The class 1 rating is an exclusive designation that can only be awarded by fm global which indicates the successful testing of the entire roof assembly using fm approval standard 4470. To be rated as a class 1 panel roof assembly only class 1 approved components may be used.

For insulated steel roof deck assemblies fm class 1 includes fm 4470 and fm 4450 approval standard for class 1 insulated steel decks roofs. Roof damage caused by wind occurs when the air pressure below the roofing assembly is greater than the air pressure above the building s roof. Approval standard fm 4470single ply polymer modified bitumen sheet built up roof bur and liquid applied roof assemblies for use in class 1 and noncombustible roof deck construction approval standard fm 4471class 1 panel roofs approval standard fm 4475class 1 steep slope roof covers approval standard fm 4476flexible photovoltaic modules. While a class 1 assembly can be substituted for a class a b or c roof assembly a class a b or c assembly cannot be substituted for a class 1 roof assembly.

According to the scope of fm 4470. 050 060 or 080 versiflex pvc reinforced membrane white gray or tan deck type 2 insulation 3 insulation thickness maximum slope for astm e 108 class a rating. The standard applies to all components as assembled in the system below the roof cover. The class 1 label is an exclusive designation that can only be awarded by fm global.

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. This standard applies to any component intended for use in assembling a panel roof including metal and plastic panel roofs. According to the scope of fm 4470. Fm class 1 roof deck construction and insulation approvals 1 membrane type.

Take the guesswork out of an fm approved roof roofnav can take the guesswork out of configuring an fm approved roofing system leaving you to focus on what matters most. Would require an fm approved class 1 60 system design and follow the requirements of data sheet 1 29. According to the scope of fm 4470.