Roofing Wind Uplift Ratings

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.

Roofing wind uplift ratings.

You only need to fill in either the city and state or the zip code. 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. With extreme wind events on the rise now is the time to. These ratings actually apply to wind uplift pressure in pounds per square foot and are not directly related to wind speeds.

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

Asce 7 uplift ratings and warranties description. The cost of a roof system is affected by the wind design but how are wind uplift ratings determined. The numeric designation 60 75 90 etc is the calculated wind uplift pressures with a 2 1 margin of safety applied. 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.

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

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 series highlights our popular duration shingles along with up to 7 other duration styles depending on where you live that feature unique performance characteristics. How are wind uplift ratings determined. 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.