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Unread 02-21-2020, 01:52 AM   #1
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Adequate Subfloor

Good day, I’m relatively new to the forum but used to install a lot of tile in college. Anyhow, I’m in the process of a garage conversion. The new subfloor is 2x8s on 24” center but they only span 8 ft. The subfloor is two layers of OSB, 3/4 and 1/2”. Most of the room will be carpet but I’d like to do about 120 sf of tile from the garage door and into a little mud room area.

I know that I would have been better served to do the joists on 16” center but I wasn’t planning on tile and was just copying the rest of the house. Overall I’d say the floor feels fairly stiff. Will this support tile or should I just use a waterproof plank flooring?

If it can support tile would it be better to use Cement board or the sites schluter stuff? Thanks!
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Unread 02-21-2020, 08:32 AM   #2
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Location: Boerne, Texas
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Welcome, Patrick.

Your subfloor, as described, is adequate for a ceramic tile installation using whatever tile substrate you prefer. Keep in mind that some thinset mortar manufacturers don't like their mortars used to bond to OSB, but that wouldn't apply to the thinset mortar used to bed CBU panels.

My opinion; worth price charged.

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