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, 2017 at 18:35
  • The thickness of the decking is 1 1/2".
    – RET
    May 21, 2017 at 19:14

1 Answer 1


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, 2017 at 19:58

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.