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Uplift Resistance

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Testing at Clemson University's Civil Engineering Department shows that roof structures can be strengthened to increase uplift resistance from 2 to 4 times the strength of nails alone.

 

Building Code required nailing patterns should develop sufficient uplift resistance for winds developed in lower category Hurricanes (Category I, II and III). However, if the building envelope is breached, internal pressures can double, thus exceeding sheathing uplift resistance causing a roof failure. History has taught us stronger hurricanes may develop sufficient uplift pressures to remove roof sheathing without window or door failure.

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Updated:  09/19/2013

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