Include drawings and details of the roof cover flashing and design loads.
Fm roof uplift ratings.
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.
These ratings actually apply to wind uplift pressure in pounds per square foot and are not directly related to.
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.
The misconception is that these numbers correlate to wind speeds of 60 90 or 120 miles per hour.
Roof projects new fm global reviews roof plans to determine resistance to anticipated wind uplift pressures and fire spread potential.
Fm approvals have classification ratings 1 60 1 90 or 1 120.
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