Wind Speed To Damage Roof

Class a for shingles that passed testing at 60 mph.

Wind speed to damage roof.

Class d for shingles that passed testing at 90 mph. A category 1 hurricane can do some major damage especially to manufactured homes ripping them apart during sustained 80 mph winds. Hrt employed a wind simulator figure 4 capable of producing wind speeds up to 175 mph and compliant with astm d3161 standard test method for wind resistance of steep slope roofing products fan induced method. How to spot wind damage roof leaks.

Most people associate wind damage with major storms like tornadoes and hurricanes but any high winds can cause property damage. As wind moves over a roof its effect is not uniform. Wind speed on the roof can be up to 2 times the approach speed which is the speed of the wind as it blows toward the home. Estimating wind speed is a difficult task and the above scale is meant simply as a guide.

Reduced air pressure from fast moving air just above the surface of the roof also increases the amount of uplift. In fact thunderstorms account for half of all severe damage in the lower 48 states. Post test inspection of all shingles that unbonded during the testing revealed that at a minimum creases were present. Within the swop program we are much more interested in the damage incurred by the wind rather than an actual speed.

In between breezes and twisters is a whole range of wind speeds that incrementally damage the roof system. These are perhaps the easiest to find simply because there is water coming into your house where it. Astm d7158 or the standard test method for wind resistance of sealed asphalt shingles uplift force uplift resistance method. According to the national severe storm laboratory severe thunderstorms can generate winds exceeding 100 mph about twice the 50 60 mph threshold for damaging winds.

Roofs are designed to resist the typical wind loads of their location but no roof is likely to withstand the most extreme wind event. Damaging winds or straight line winds are classified as exceeding 50 to 60 miles per hour but can reach up to one hundred miles per hour. But in reality it doesn t take hurricane winds to damage your roof. If you have reliable wind equipment you are welcome to send us actual values.

Identifying wind damage to your roof if you ve recently experienced winds of 45 mph or higher then call us and we will get outside and take a look at your roof for some of the common signs of roof damage. Class f for shingles that passed testing at 110 mph. Curling shingles are most often found.