I m finding it much simpler just to use the manufacturer wind warranty options than screwing with all this fm stuff.
Fm global roof ratings.
The registration process is free and only takes a few minutes to complete.
Situation is i speced a roof customer emailed last night asking wind rating i spent hours trying to figure that out after hours.
In this situation the fm regional engineer specifies that the roof must have a wind rating such as 1 60 1 75 or 1 90.
Roofnav can take the guesswork out of configuring an fm approved roofing system leaving you to focus on what matters most.
Because fm approvals requires a 2 1 safety factor roofs with field of roof uplift forces of 30 pounds per square foot are the maximum for 1 60 ratings and 37 5 pounds per square foot are the maximum for 1 75 ratings etc.
Because fm approvals requires a 2 1 safety factor roofs with field of roof uplift forces of 30 pounds per square foot are the maximum for 1 60 ratings and 37 5 pounds per square foot are the maximum for 1 75 ratings etc.
A roof assembly is tested to meet.
The following guidelines outline vulcraft s understanding of two possible approaches that may be taken concerning additional roof deck design requirements fm may require.
The end result as tom s article points out is that there are currently many fewer roof system options available that meet the vsh rating roughly 600 vsh rated assemblies of the 1 million fm global roofnav assembly listings.
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.
The research is also used to enhance external standards.
Fm approvals is the only organization in the world that tests complete roof assemblies when subjected to multiple perils such as fire testing above and below the deck wind uplift testing hail damage testing accelerated weathering water leakage foot traffic and corrosion resistance testing of metal parts.
New users can begin their free registration here.
Include drawings and details of the roof cover flashing and design loads.
Fm global wind ratings explination.
This may be all that is specified.
Fm wind rating specified only.
The following information is needed to conduct a thorough review of new roof installations and re roofing projects.
Technical reports supporting code change.
