Floor construction advice/ check my work, please.
I just got back from Lowes to source flooring supplies. I wasn't exactly sure how I wanted to do my floor and decided that I'd let the supplies sort of tell me since there is a limited amount of supplies that are available on the shelf. My first thought (which isn't what I bought today) was to do the following:
3/8 " closed cell foam in valleys
1" PolyIso in grid pattern furring strips
But... After moving like, 30 sheets of 1/2" ply looking for flat ones I gave up. That plan wasn't jiving with available supply. Furthermore, any furring material I saw was a different thickness than the foam board (both 1/2 and 1"). Thats fine, I sort of knew to expect that. Over the years I have used a circular saw in place of a table saw and so I don't have a table saw to make my own furring strips. I can fashion a guide to make a few with the circular saw, but I don't want to rip a ton of boards. So....I cobbled together a new plan based on materials available.
3/8" closed cell foam in valleys
3/4 " hardwood maple ply. This stuff is pricey but dry, flat and dense. I sort of built my whole plan around this ply.
The biggest change up in my plan is that I'm moving away from a furring grid to a XPS foam board sandwich, utilizing furring strips along the walls, in the slider and along the bulkhead. As for the rest of the floor, I'm hoping I can use the rigidity of 3/4" ply to avoid excessive foam board compression. Looking at the layout, I'm leaning toward using the tie downs combined with custom brackets and then bolt through the floor in selective spots to secure and level the plywood. The corner stone of this plan is this dead straight hard maple ply I found. It looks like it wants to be a good floor.
luxury vinyl plank flooring
Am I being naive with my thinking that I can bolt down a sandwich of 3/8" closed cell, 1/2" XPS and 3/4" plywood as a long term solution for a full build out? If you have advice for me tell me now before I do something stoopid. 😀