Replies

1. 
   jlyda | Feb 02, 2020 02:44am | #1

   If your vinyl plank is 1/4” (+/-) and you want it to be flush. You will install one layer of 1/2”. I would screw the existing 1/2” layer to the joist really well first and glue/screw a new layer of 1/2” good quality plywood on that. I would screw about every 6” and make sure to stagger plywood seams, so you don’t have seams of existing 1/2” and new 1/2” in same area. If the new floor is slightly lower or higher it won’t be noticeable as you will need to have a floor transition where the floors meet anyway. The vinyl plank can’t be installed tight to the wood floor as it is a floating floor. If you are installing a thin glue/stick down type flooring, you’ll need a layer of approved flooring underlayment to keep imperfections in subfloor from transferring through to the vinyl plank. The approved underlayment is a plywood that is thin (around 1/8”) and manufacturers usually suggest using a finish stapler to fasten it to the floor (no glue). You will still need to install the 1/2” with the glue down for strength as well.

1. 
   calvin | Feb 02, 2020 08:41am | #2

   J,
   Armstrong’s and others approved underlay here is a true 1/4”.

   Original poster, get all your thicknesses right before you start. The process J has detailed is what I have followed with success.