Fm Class 1 Roof Assembly

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.

Fm class 1 roof assembly.

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. According to the scope of fm 4470. The performance of a panel roof depends in part on all components in its makeup and on how these components interact. 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.

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. However the absence of a hail damage resistance indicates sh. According to the scope of fm 4470. 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.

Fm class 1 roof deck construction and insulation approvals 1 membrane type. 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 panel roof assembly meeting the requirements of this standard shall receive a listing in roofnav as a class 1 x y panel roof. Where x indicates the hail damage resistance mh or sh and y indicates the windstorm classification 60 75 90 105 120.

This standard applies to any component intended for use in assembling a panel roof including metal and plastic panel roofs. Versiflex pvc mechanically attached roofing system factory mutual fm approvals b. 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. The standard applies to all components as assembled in the system below the roof cover.

Would require an fm approved class 1 60 system design and follow the requirements of data sheet 1 29. To be rated as a class 1 panel roof assembly only class 1 approved components may be used. 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.