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.
Fm class 1 roof assembly.
As wind flows over the building the pressure directly above the surface of the roof decreases.
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.
According to the scope of fm 4470.
Where x indicates the hail damage resistance mh or sh and y indicates the windstorm classification 60 75 90 105 120.
According to the scope of fm 4470.
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.
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.
For insulated steel roof deck assemblies fm class 1 includes fm 4470 and fm 4450 approval standard for class 1 insulated steel decks roofs.
Fm class 1 roof deck construction and insulation approvals 1 membrane type.
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.
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 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.
Designed to help roofing professionals roofnav provides easy access to the most up to date fm approved roofing related information and related installation.
The standard applies to all components as assembled in the system below the roof cover.
The performance of a panel roof depends in part on all components in its makeup and on how these components interact.
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.
