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The threading design on roofing screws varies according to application needs, with coarse threads for wood substrates and finer threads for metal decking. Most versions include a neoprene or EPDM rubber washer that compresses during installation to form an impermeable barrier against moisture intrusion. Roofing screws are available in lengths from 1 inch to 8 inches to accommodate different material thicknesses, with diameters typically ranging from #12 to #14 for optimal load distribution. The special drill point geometry allows roofing screws to penetrate multiple layers while minimizing material distortion.
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