This standard applies to any component intended for use in assembling a panel roof including metal and plastic panel roofs.
Fm class 1 roof assembly.
Designed to help roofing professionals roofnav provides easy access to the most up to date fm approved roofing related information and related installation.
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.
The standard applies to all components as assembled in the system below the roof cover.
However the absence of a hail damage resistance indicates sh.
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.
As wind flows over the building the pressure directly above the surface of the roof decreases.
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.
Versiflex pvc mechanically attached roofing system factory mutual fm approvals b.
Fm class 1 roof deck construction and insulation approvals 1 membrane type.
Would require an fm approved class 1 60 system design and follow the requirements of data sheet 1 29.
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.
According to the scope of fm 4470.
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.
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.
For insulated steel roof deck assemblies fm class 1 includes fm 4470 and fm 4450 approval standard for class 1 insulated steel decks roofs.
Where x indicates the hail damage resistance mh or sh and y indicates the windstorm classification 60 75 90 105 120.
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.
The panel roof assembly meeting the requirements of this standard shall receive a listing in roofnav as a class 1 x y panel roof.
