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Originally Posted by mrcaptainbob
Why is treated wood preferred for this application? I thought treating was to keep from being infested. Should be no infestation indoors. I would think untreated pine 2x's and sheet wood would be fine. I did similar in my place with a double layer of 3/4 ply on top of sistered joists. Sisters were glued and through bolted every staggered 18". Solid like a rock. If I do another, though, I'll lay the first layer diagonal.
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I opted for treated lumber for a couple of reasons:
I live in a tropical and highly humid environment to begin with (south Texas only one block from the shore). In a bathroom environment, there is even more possibility of moisture exposure. It may be a little more expensive ($46 a sheet) but treated 3/4" provides near immunity from moisture and excellent longevity. It is also highly resistant to terminates which are also prevalent in this climate.
Plywood, if I understand it correctly, is just a glued sandwich of alternating grain sheets. How would it help to lay it diagonally? It seems like this would require far more wood to get the project done.
Quote:
Originally Posted by pushkins
If you still want to use the double layer of CCA/CCQ then add a 1/4" layer of flooring ply before you lay the peel and stick tiles.
Don't forget though you should also use a "primer" before you lay the tiles, you can get it in any of the bog box stores in the flooring department.
There is no real reason to replace the "cross members" around the toilet flange, the floor joists and the "double" layer of floor sheathing is way more than enough.
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Would a sign-quality oil-based primer work on the floor-ply or is there a specific primer for this application?
Floor height is going to be a concern if I add something on top of the 1-1/2" of flooring. I guess a small step up into the bathroom is a small price to pay for the peace of mind and the ability to park an M1-A1 Abrams Main Battle Tank next to the vanity.
Is there another type of flooring that would be better suited to the treated plywood?
I really appreciate all the advice! Having a couple (more experienced) heads to run the project by has really helped a lot.