Fm Class 1 Roof Assembly

The performance of a panel roof depends in part on all components in its makeup and on how these components interact.

Fm class 1 roof assembly.

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. However the absence of a hail damage resistance indicates sh. Fm class 1 roof deck construction and insulation approvals 1 membrane type. 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.

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. This standard applies to any component intended for use in assembling a panel roof including metal and plastic panel roofs. 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. 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.

Where x indicates the hail damage resistance mh or sh and y indicates the windstorm classification 60 75 90 105 120. The standard applies to all components as assembled in the system below the roof cover. For insulated steel roof deck assemblies fm class 1 includes fm 4470 and fm 4450 approval standard for class 1 insulated steel decks roofs. According to the scope of fm 4470.

To be rated as a class 1 panel roof assembly only class 1 approved components may be used. 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. 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.

Versiflex pvc mechanically attached roofing system factory mutual fm approvals b. As wind flows over the building the pressure directly above the surface of the roof decreases. Would require an fm approved class 1 60 system design and follow the requirements of data sheet 1 29.