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danxp 10-08-2012 03:30 PM

1/4" plywood over sleepers?
tried searching and couldn't find anything on the topic...

i'm putting in new 2 1/4"-wide-3/4"-thick red oak flooring over an old existing subfloor that's the diagonal sleepers you typically find in old 1950s homes... my issue is that there are several areas where the floor is about a pinch uneven... i'm considering doing one of the following...
1. putting 1/4" plywood on top of existing 50s subfloor, then doing the new hardwood...
2. doubling or even tripling up on 15# felt/tar paper over sleepers, then install the new hardwood...
3. ripping out the existing sleeper subfloor and putting down 3/4" plywood...

i know #3 is probably the right way, but it's by far the most expensive and time consuming... i'm leaning towards #2 since it'll be the quickest and cheapest...

actually, #1 is probably going to be pretty expensive as well since i'd be putting in tar paper between each layer...


sixeightten 10-08-2012 03:57 PM

I would probably opt for #1, but use 1/2" instead of 1/4". Not much diff at all in price, but the strength is a lot better. The extra layers of felt will not do much at all in my opinion. Tearing out all and using 3/4 is definitely the best, but as you know it cost more and the labor is probably triple that way.

JazMan 10-08-2012 07:12 PM


How do you think adding new thin plywood is gonna fix an uneven floor? The new ply is gonna follow the same shape as it's installed over, nothing will change. The only way ply would help is if you used structural ply like 3/4" and the old floor was only a little low between the joists.

You need to figure out what is not in plane and by how much.


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