To be rated as a class 1 panel roof assembly only class 1 approved components may be used.
Fm global class 1 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.
However in many instances these non fm global insured buildings do not meet fm approvals minimum requirement for roof decks etc yet the designer still calls for an fm approved system.
The standard applies to all components as assembled in the system below the roof cover.
According to the scope of fm 4470.
Fm approval standard 4880 class 1 fire rating of insulated wall or wall roof ceiling panels interior finish materials or coatings and exterior wall systems.
Fm approved roof assemblies must conform to one or more approval standards which include approval standards 4450 for class 1 insulated steel deck roofs approval standard 4470 for class 1 roof covers approval standard 4471 for class 1 panel roof or approval classification standard no.
This section contains reports that are generated to update national and international codes and standards.
This standard applies to any component intended for use in assembling a panel roof including metal and plastic panel roofs.
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 global conducts research for use in the data sheets that our engineering field staff use to support our client s efforts to protect their business.
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.
The best rating achieved is class a which is described by ul as effective against severe fire exposure class 1 rating.
Fm global property loss prevention data sheet 1 28 wind design.
The research is also used to enhance external standards and codes.
Class 1 the class 1 label is an exclusive designation that can only be awarded by fm global.
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Roofnav can take the guesswork out of configuring an fm approved roofing system leaving you to focus on what matters most.
The assembly which exhibits low fire spread below and above the panel adequate simulated wind uplift resistance and adequate strength and durability during the approval examination will qualify as a class 1 assembly.
According to the scope of fm 4470.
This test is significant as it indicates the successful testing of the entire roof assembly using fm approval standard 4470.
Fm global property loss prevention data sheet 1 31 metal roof systems.
