Can i get away with 1/2" plywood over a slab?
#1
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Can i get away with 1/2" plywood over a slab?
Hi all,
80% of my house is raised with 3/4" plywood sub-floors, i've already installed 3/" red oak in these areas and it came out great.
Now we're to the part of the house that's a little bit of a head scratchier. We have a sunken den that also has a bedroom connected to it, both are on slab. When we bought all of our flooring months ago we decided to pick out 3/8" red oak for these room because we knew we'd have transition issues with it being on a slab.
Originally we had planned to do a glue down, but after doing more research I think i'd rather lay down plywood and just go with good ole nail down instead.
My question though is if I can reasonably get away with going with 1/2" plywood instead of 3/4"? It would just make me feel a lot better about all of the transitions we're going to have. With the flooring being 3/8" I could go with a 1" cleat and i'm pretty sure I'd clear.
Just wondering if this is a terrible idea or not.
80% of my house is raised with 3/4" plywood sub-floors, i've already installed 3/" red oak in these areas and it came out great.
Now we're to the part of the house that's a little bit of a head scratchier. We have a sunken den that also has a bedroom connected to it, both are on slab. When we bought all of our flooring months ago we decided to pick out 3/8" red oak for these room because we knew we'd have transition issues with it being on a slab.
Originally we had planned to do a glue down, but after doing more research I think i'd rather lay down plywood and just go with good ole nail down instead.
My question though is if I can reasonably get away with going with 1/2" plywood instead of 3/4"? It would just make me feel a lot better about all of the transitions we're going to have. With the flooring being 3/8" I could go with a 1" cleat and i'm pretty sure I'd clear.
Just wondering if this is a terrible idea or not.
#2
Group Moderator
I don't think 1/2" would be enough for nailing the floor down and I'm not even sure you can nail a 3/8" thick floor. If you can nail you'll be going through the tongue so the nail will only be in about 3/16" of the flooring and rest into your subfloor.
#3
Does your floor list a floating option with the 3/8" you purchased, a glue to each other floating floor would be your easiest solution.
Here is a handy chart on various profiles and cleat penetration.
Here is a handy chart on various profiles and cleat penetration.

#5
Group Moderator
I would think plywood on the slab would have to be PT and I can't even begin to imagine how much that would warp.