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.

Roofing wind uplift ratings.

Understanding wind uplift ratings for roofing. 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. 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. The paper examines the use of ultimate strength design safety provisions in wind uplift design.

Sometimes a roofing designer will assume that a design wind speed requirement of 90 mph then the roof system rating will be 1 90. In this scenario our building. Duration series shingles are unrivaled by any other architectural shingles because they feature our patented surenail technology a technological breakthrough in shingle design. Mark gallant jun 22 2020.

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 numeric designation 60 75 90 etc is the calculated wind uplift pressures with a 2 1 margin of safety applied. You only need to fill in either the city and state or the zip code. These ratings actually apply to wind uplift pressure in pounds per square foot and are not directly related to wind speeds.

The use of wind pressure tables included in the monograph which allow the selection of wind pressure values without detailed calculations and converting them to fm global wind uplift ratings is explained. The cost of a roof system is affected by the wind design but how are wind uplift ratings determined. 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. Wind speeds of 60 90 or 120 miles per hour.

Asce 7 uplift ratings and warranties description. Damentals of wind uplift on low slope roofs. How are wind uplift ratings determined. 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.