Quote:
Originally Posted by West Coast GTO
I didn't even think that spiral nails were galvanized or rated for exterior use. The square headed deck screws also have a reverse spin component on the upper shaft next to the head that helps keep the deck board from lifting.
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I am pretty sure the reverse threading at the top of these screws is to pull the material of the deck board (specifically made for composites) back into the board itself, thus there is no 'tear out' material left over at the top of the hole. Makes for a cleaner job.