Roof Wind Ratings

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Roof wind ratings.

With extreme wind events on the rise now is the time to. One thing to watch out for is an installer utilizing staples to install the roof. 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.

The 3 tab 60 mph to 70 mph wind uplift rated roof covering shingles will be ripped off and leaks will be inevitable. Consumers are pleased with the low price thickness of shingles and warranty coverage. 110 130 mph wind warranty. 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.

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. This type of roofing material is classified based on wind speed resistance and with wind ratings categorized as follows. 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.

Architectural grade shingles rated to withstand wind gusts up 130 mph are your best bet for high wind areas. 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. 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. Class a fire resistance rating.

The minimum wind approval rating is 60 psf. The height of the roof and exposure and risk categories are factors that are used to convert design wind speed to an uplift pressure. For example if the pressure level was at 105 psf when the failure occurred the approval level would be set at the preceding level or 90 psf giving the assembly a 1 90 rating. 6 1 see wind map worksheet of this workbook.

For basic wind speed map fig. A typical architectural laminate carries a 110 mph wind rating using 4 5 nails. With all that said if we were to rank the roofing materials from best to worst for coastal living it would go like this. 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. In most cases using staples will void the manufacturer wind rating warranty.