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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?

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  • what thickness is the decking underneath ?
    – Alaska Man
    May 21, 2017 at 18:35
  • The thickness of the decking is 1 1/2".
    – RET
    May 21, 2017 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.

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  • 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, 2017 at 19:58

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