Originally Posted by Mikethebuilder
I'm using 1x2 furring strips for my subfloor and didn't think ahead to check the available thicknesses at Home Depot. I ended up having to go with 1" polyiso. This is leaving about a 1/4 gap between the top of the furring strip and the top of the insulation boards (insulation being taller than the furring strips). Should this cause any issues?
I thought about ripping down some of the scrap 1x2's and cutting them into a bunch of spacers that I can glue on top of the furring strips to support the top layer of plywood once I lay that down. Not sure if that is necessary?
Any thoughts would be greatly appreciated!
The issue will be that your screws will pull through your flooring when you try to send them home tight; or, the floor will squeak because the fastener couldn't cinch the two pieces of wood tight.
The fix would be to include a spacer on the furring strips. Could be 1/4" ply or even masonite (I'd stick to plywood). Make sure the furring strips stand proud (higher than) the insulation, otherwise you may see a dip in the finished floor wherever two pieces of subfloor meet.
Best practice is to glue everything down, even if you just use a thin bead of adhesive.