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What length of screw should be used when screwing 3/4" plywood subfloor to the decking underneath, in preparation for a new sheet vinyl floor?

  • what thickness is the decking underneath ? – Alaska Man May 21 '17 at 18:35
  • The thickness of the decking is 1 1/2". – RET May 21 '17 at 19:14
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If it were me and i was going to put additional underlayment down on top of the new 3/4 ply, i would use at least 2 1/2" screws and do my best to find the floor joists below. if you are using the new ply directly as underlayment i would use 1 1/2 screws to attach to decking.

  • We are using the new 3/4" plywood as the underlayment against the decking, so will probably use the 1 1/2" screws as you suggest. Thanks – RET May 21 '17 at 19:58

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