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Unread 06-28-2012, 07:06 PM   #1
Reefgeek
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Sub floor questions

I'm in the process of remodeling a friends living room and was asked to replace the tile in the entry way as well. The old tile was popping off the thin set and most of the grout had disintegrated. (grout was never sealed)

The sub floor looks to be 3 layers. 3/4" plywood on bottom with 1/2" ply in the middle and what looks to be 1/4" luan on the top.

They had a closet built over the sub floor (tile removed)


Question being.... should i remove any layers of the sub floor? currently the new tile would end up level with the carpet.

Thanks
Dennis
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Unread 06-28-2012, 07:40 PM   #2
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Some additional info...

The area in question is going to be tiled for the 4th time. Built in 1967. The first two tile jobs were done on the 1/2" plywood layer. The 3rd was built on the luan plywood. There was never any problems with the first two tile jobs, they just wanted changes made.

The third tile job was done 16-18 years ago and the grout was NEVER sealed. My guess is that is part of the reason why the grout discintegrated.

My thought is to cut the luon ply around the edges of the newer walls and lay down 1/4" hardibacker or cement board.

Sound right?
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Unread 06-28-2012, 08:51 PM   #3
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the 1/4" should be removed, and is a more likely source of problems than not sealing the grout in my opinion.
I've used 1/4" in the past and had the same problems you are describing.
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Unread 06-29-2012, 06:44 AM   #4
Reefgeek
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I figured the 1/4" luan ply is a problem.

Should I use a 1/4 cement board or just install right onto the sub floor plywood?
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Unread 06-29-2012, 07:06 AM   #5
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You should install CBU or some other tiling substrate, Andrea. And that presumes the three layers of plywood are installed such that at least the top layer is very stable.

Rarely a good idea to tile directly to plywood in a remodel application.


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Unread 06-29-2012, 08:28 AM   #6
Reefgeek
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Thanks! I will let him know.
This time it was my husband posting...Dennis
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