Hex washer head roofing screws with an integral EPDM rubber washer are commonly found in roofing and siding applications. They are designed to be driven with a wrench or socket for ease of installation. They are also fully threaded from tip to head.
The EPDM rubber attached to these screws acts as a barrier preventing leaking from occuring near the screw head. The integral washer also distributes pressure over a wider surface area to prevent damage during installation.
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