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Old 09-12-2017, 01:41 PM   #6
John Bridge
Join Date: Mar 2001
Location: Houston, Texas
Posts: 67,298
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Hi David,

I've tiled quite a few floors consisting of inch-and-an-eighth Sturd-I-Floor ply or OSB over trusses set on 24 in. centers. I also agree with Kevin that two layers of plywood will do the trick, too. No glue between the two layers, and butt joints of the top layer overlap those of the first.

There are a couple of good articles in our Liberry. Scroll down to Posts 14 and 15.
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