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Unread 05-11-2011, 07:23 PM   #1
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Join Date: Jan 2011
Location: Backwoods, Tennessee
Posts: 10
John's largest tile job to date...need advice

I am starting a large tile job in a week or so and need some advice.
This is a master bath of 160 sqft. The subfloor has been replaced with 2 layers of 5/8 exterior rated plywood using correct screws and spacing. The structure is 2x10's on 16 spanning 14' so the deflecto is ok for ceramic. I'm planning on Latircete 254 under Ditra and Ditraset to set 20 x 20 porcelain ceramic tiles. The biggest concern I have is the wall tiles. There will be 4 courses of 12x24's set subway style with a 4x6 bullnose on top. The walls are a combination of bare sheetrock, mud and some PVA primer.
My questions are:
- What setting materials would you suggest for the walls?
- When setting the wall tiles should I set the second course first using a cleat and then work up or start at the floor?
- What do you recommend for the wall to floor joint?
- What do you recommend for the corners?
Thanks for any comments or suggestions.
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Unread 05-11-2011, 08:48 PM   #2
Crestone Tile
Join Date: Apr 2008
Location: Colorado
Posts: 2,315
Hi John,

Setting 12 x 24 tile requires a super flat substrate (no more than an 1/8" in eight feet of plane deviation).

Setting 12 x 24 tile on a 50% offset as you describe (subway) requires super flat tile. Most people shy away from it, but it can be done with the proper skill and quality tile. A modified thinset mortar is good for the walls ... polymer / latex fortified mortars.

For the changes of plane joints (corners / floor to wall), a flexible caulk is the right way to go. I prefer silicone, but I make my own to match. Some manufacturers have silicone matched to their grout. All manufacturers have acrylic caulk matched to their grout. Acrylic is easier to work with, but it is not as durable. Acrylic would be fine in your situation though.

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Unread 05-12-2011, 06:55 PM   #3
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Location: Backwoods, Tennessee
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Thanks for the response Matt. I checked the wall and the longest unbroken wall (10') is out about 1/8" in 4 feet at one stud. Would you attempt this install? If so, what notch size would you use for the walls? The other unaswered question is would you start this install with the second course on a cleat?
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