30 Mph Wind Rating Roof Design

Furthermore the roofing designer or specifier sometimes assumes if there is a design wind speed requirement of 90 mph then the roof system must have a 1 90 rating which is not always true at least not for the reason they think maybe for tall buildings or if other factors exist.

30 mph wind rating roof design.

They also meet city of los angeles cool roof requirements. If your home has a gable roof two sided pitched roof the end wall takes a beating during a hurricane and typical framing methods create a vulnerable hinge line at the joint between levels. Wind resistance 130 mph. Design in the roof design in the roof.

Design guide figure 1 0 table 1 0 wind classification conversion table wind classifi cation gust wind speed regions a b regions c d metres per second n1 non cyclonic n a w28 n2 non cyclonic n a w33 n3 non cyclonic c1 cyclonic w41. Class design pressure equivalent wind velocity in mph structural test pressure in psf inches of water structural test pressure equivalent wind velocity in mph water test pressure in psf inches of water water test pressure equivalent wind velocity in mph. Decra also provides lab verified installation. Class a for winds up to 60 mph class d 90 mph class f 110 mph class g 120 mph and class h 150 mph homeowners should be aware that wind velocity varies across a roof and causes different uplift pressures depending on wind gusts the landscape surrounding the home the shape of the roof and the design of the roof edge.

Decra roofs also have the resilience and durability to withstand the most challenging wind conditions even in florida s high velocity hurricane zones and are backed by the roofing industry s best lifetime limited warranty for wind speeds up to 120 mph per standard installation practice. For basic wind speed map fig. 6 1 see wind map worksheet of this workbook. Wind speed 115 mph.

Design wind pressure for c c shall not be less than a net pressure including internal. Duration cool shingles are rated by the cool roof rating council crrc and meet the prescriptive cool roof requirements of california title 24 part 6. 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. T3 1 30 direction multiplier m d.