The best rating achieved is class a which is described by ul as effective against severe fire exposure class 1 rating.
Fm class 1 roof deck.
This standard states fm approvals requirements for theapproval of class 1 insulated steel roof decks aclass 1 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.
Approval criteria may include but are not limited to performance requirements marking requirements examination of manufacturing facility ies audit of quality assurance procedures and a follow up program.
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.
For roof areas where the wind rating recommended for the field of the roof does not exceed fm class 1 75 75 pounds per square foot psf 3 6 kpa roof perimeter attachment now is rec ommended to be increased a minimum of 50 percent with at least one fastener per 2 square feet 0 186 m2 and roof corner attachment is recommended to be increased 100 percent with at least one fastener per square foot 0 092 m2.
Designed to help roofing professionals roofnav provides easy access to the most up to date fm approved roofing related information and related installation recommendations from relevant fm global property loss prevention data sheets.
Please note also the needed deck gage and yield strength.
In this scenario our building which is designed with 23 pounds per square foot of uplift would require an fm approved class 1 60 system design and follow the requirements of data sheet 1 29 for corner and perimeter enhancements.
The standard applies to all components as assembled in the system below the roof cover.
Determine the maximum steel deck span from fm 1 29 tables 1a 1d for 1 5b decks or 1e for 3n decks for the roof covering required.
A class 1 panel roof is one which meets the criteria of this standard for fire wind foot traffic and hail damage resistance.
The standard applies to all components as assembled in the.
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 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 type of roof deck on the building.
This will apply for zone 1.
