Roofing Wind Uplift Ratings

The numeric designation 60 75 90 etc is the calculated wind uplift pressures with a 2 1 margin of safety applied.

Roofing wind uplift ratings.

The 2020 atlantic hurricane season is off to the fastest start in recorded history and warmer ocean temperatures are expected to generate hurricanes and tropical storms with much more frequency and intensity. Mark gallant jun 22 2020. Sometimes a roofing designer will assume that a design wind speed requirement of 90 mph then the roof system rating will be 1 90. A balance should be achieved so that the cost to prevent blow off isn t unnecessarily high while the wind resistance capacity is sufficient for a roof to stay intact according to the appropriate wind related classification.

You only need to fill in either the city and state or the zip code. In the industry there is a need to sort out the confusion between building codes uplift rated assemblies and warranties by explaining what each offers and how they should be considered. 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. Asce 7 uplift ratings and warranties description.

These ratings actually apply to wind uplift pressure in pounds per square foot and are not directly related to wind speeds. In this scenario our building. The paper examines the use of ultimate strength design safety provisions in wind uplift design. Damentals of wind uplift on low slope roofs.

With extreme wind events on the rise now is the time to. How are wind uplift ratings determined. Duration series shingles are unrivaled by any other architectural shingles because they feature our patented surenail technology a technological breakthrough in shingle design. 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 series highlights our popular duration shingles along with up to 7 other duration styles depending on where you live that feature unique performance characteristics. The cost of a roof system is affected by the wind design but how are wind uplift ratings determined. Wind speeds of 60 90 or 120 miles per hour. Understanding wind uplift ratings for roofing.