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Old 03-22-2014, 10:19 AM   #1
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Tile over OSB


I have vertical OSB skirting attached to a 2x4 frame for a sunken tub surround. We plan on finishing the bathroom with subway tile. Can I adhere the subway tile directly to the OSB, or should overlay cement board first? I've seen many posts about OSB flooring and tiling, and using cement board first, but this OSB has no stress/pressure on it. Or am I still bound by the fact that the two substrates (tile & OSB) have different expansion properties, thus cement board is a must?

Thoughts?
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Old 03-22-2014, 02:14 PM   #2
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You should never try and adhere tile directly to osb Install some backer board over the osb first.
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Old 03-22-2014, 04:04 PM   #3
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Quote:
Originally Posted by mako1 View Post
You should never try and adhere tile directly to osb Install some backer board over the osb first.

Add to this----waterproof the backer before tiling---that will protect the wood sub-straight from water damage if someone splashed water out of the tub----a paint on waterproofing will work well---
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