UL Wind Uplift Ratings
UL Wind Uplift Ratings
(OP)
UL wind uplift ratings for roof assemblies only go up to 105 psf. What do we do if we have wind loads in corner and edge zones in excess of this? It is not unusual to have wind uplift values in the 120 to 150 psf range.






RE: UL Wind Uplift Ratings
Check the manufacturer's test literature and see if they also have an evaluation report for the membrane system you are considering.
RE: UL Wind Uplift Ratings
I've looked at FM-28 for other projects. It looks like UL has responded to industry demands and only run tests for 90 psf. I did a quick calculation for a "typical" building this morning and found that for 100 mph, exposure C the highest pressure in the corners is about 90 psf.
RE: UL Wind Uplift Ratings
Uphill battle, but can be won. FM helps a lot since they are as widely accepted as UL and since they are an insurance-driven group, they have an interest in testing to much higher loads.
RE: UL Wind Uplift Ratings
Say you buy a toaster and it has a UL label on it. Does that apply to the cord or the toaster?? Often, it only applies to the cord. How does the public know?? That is my problem with the UL label!!
RE: UL Wind Uplift Ratings
RE: UL Wind Uplift Ratings