Roofing Wind Uplift Ratings

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.

Roofing wind uplift ratings.

Mark gallant jun 22 2020. 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. Windspeedbyzip is a tool for architects engineers and builders to easily determine the 3 second gust basic windspeed figure 6 1 of asce 7 05 and now design wind speed per asce 7 10 maps for any location in the continental united states to determine the basic windspeed fill in the address below. You only need to fill in either the city and state or the zip code.

Therefore a system listed as a 60 system can be utilized for projects where the roof field pressures are calculated to be 30 psf or less. These ratings actually apply to wind uplift pressure in pounds per square foot and are not directly related to wind speeds. With extreme wind events on the rise now is the time to. 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.

Duration series shingles are unrivaled by any other architectural shingles because they feature our patented surenail technology a technological breakthrough in shingle 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. The numeric designation 60 75 90 etc is the calculated wind uplift pressures with a 2 1 margin of safety applied. 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.

Understanding wind uplift ratings for roofing. In this scenario our building. Damentals of wind uplift on low slope roofs. 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.

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. How are wind uplift ratings determined. The paper examines the use of ultimate strength design safety provisions in wind uplift design. Wind speeds of 60 90 or 120 miles per hour.