Roof Damage Wind Speed

According to the national roofing contractors association nrca most wind damage to a roof starts on the edge.

Roof damage wind speed.

In between breezes and twisters is a whole range of wind speeds that incrementally damage the roof system. Shingles roofs especially take a beating during high winds despite most being rated to withstand 90 mph winds. Class d for shingles that passed testing at 90 mph. The effect of wind moving over a roof is not uniform.

Certain regions will be subject to higher pressures such as along the perimeter. According to the national weather service slight damage can begin when winds reach 45 mph but this range is considered non severe. Class f for shingles that passed testing at 110 mph. 58 74 mph.

Areas like the corners and perimeter of the roof can be susceptible to higher wind pressures while the center of the roof might have lower stresses. These differences can also account for the amount of damage sustained. Damage to your roof can begin at around 50 mph so you should know how to check your roof for such damage. Roof shape and slope wind speed and load will react differently on different roof shapes and slopes.

Roofing material condition roofing materials in poor condition will naturally be more susceptible to wind damage. Astm d7158 or the standard test method for wind resistance of sealed asphalt shingles uplift force uplift resistance method. These non severe winds may cause some tree branches to break off and can cause damage to already loose or susceptible shingles. 45 57 mph.