| http://www.w3.org/ns/prov#value | - Likewise, a sharp object such as a knife or a screw driver will not make contact with the membrane and possible puncture the membrane.Weather-related damage that have been a concern for flat roofs include items such as wind blow debris including sheet metal, such as from ventilators and air conditioner units, and tree branches blowing across the roof and puncturing themembrane.
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