Fm Global Roof Ratings

Roofnav can take the guesswork out of configuring an fm approved roofing system leaving you to focus on what matters most.

Fm global roof ratings.

In fact it is unique among other testing laboratories in the way that it performs wind uplift testing it uses full scale roof sections measuring 12 feet by 24 feet to obtain an accurate view of expected real world performance. Successful constructions over steel roof decks are designated by fm global as class 1. Provide perimeter and flashing details to fm global for review. Fm wind rating specified only.

The research is also used to enhance external standards. Fm global wind ratings explination. To establish burning on the underside of a test deck. This may be all that is specified.

In the case of roofing systems fm is particularly well known for determining how roofing performs not only for fire but also for high wind. I m finding it much simpler just to use the manufacturer wind warranty options than screwing with all this fm stuff. Situation is i speced a roof customer emailed last night asking wind rating i spent hours trying to figure that out after hours. Flashing details should be in compliance with data sheet 1 49 perimeter flashing.

Technical reports supporting code change. 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. 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. 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. Fm global uses a furnace calorimeter that measures heat released by the test specimen with no more than 400 btu per minute released during the steepest three minutes of the temperature curve. This may be all that is specified. Fm global conducts research for use in the fm global data sheets that our engineering field staff use to support our client s efforts to protect their business.