Roof Wind Ratings

The basic design wind speed v mph corresponds to a 3 second gust speed at 33 above ground in exposure category c and is associated with an annual probability of 0 02 of being equalled or exceeded 50 year mean recurrence interval.

Roof wind ratings.

Wind loads are based on the design wind speed which is based on the geographic location of the building height of the roof exposure category roof type enclosure classification and risk category. One thing to watch out for is an installer utilizing staples to install the roof. 6 1 see wind map worksheet of this workbook. With extreme wind events on the rise now is the time to.

Understanding wind uplift ratings for roofing. These single layer shingles are typically rated for winds up to only 60 mph and moderate impact from flying debris or hail. With all that said if we were to rank the roofing materials from best to worst for coastal living it would go like this. 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.

The first ratings in excess of 100 mph were those developed using an american society of testing and materials astm test standard astm d 3161 where 110 mph winds were blown over inclined surfaces of shingles for a one hour period. Mark gallant jun 22 2020. The 3 tab 60 mph to 70 mph wind uplift rated roof covering shingles will be ripped off and leaks will be inevitable. The minimum wind approval rating is 60 psf.

This type of roofing material is classified based on wind speed resistance and with wind ratings categorized as follows. Consumers are pleased with the low price thickness of shingles and warranty coverage. In most cases using staples will void the manufacturer wind rating warranty. The height of the roof and exposure and risk categories are factors that are used to convert design wind speed to an uplift pressure.

The approval for that assembly is established at the level preceding failure. A typical architectural laminate carries a 110 mph wind rating using 4 5 nails. For basic wind speed map fig. Most customer reviews of pabco roofing shingles are positive.

Class a fire resistance rating. The most common type are 3 tab shingles. 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. Shingles that passed this test were designated as f rated shingles per astm d 3161 modified to 110 mph.

The same shingle qualifies for a 130 mph wind rating level 5 hurricane if you use 6 fasteners per shingle. 110 130 mph wind warranty.