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Fields31 10-04-2011 01:08 PM

Porcelain Tile installation
1 Attachment(s)
Greetings all,

I'm about to start my first tiling project in my bathroom and I have a few questions that I hope you guys can help out with.

The area that i'm going to be tiling is 61" (from wall to wall) by 62.5" (from wall to tub). Currently there is a 3/4" wood subfloor orginal with the house (built in 1947) and I'm going to add a layer of 3/4" plywood on top of it. The bathroom sits in the middle of the house, directly above a giant beam (don't know technical term for it) that runs from foundation to foundation, with jack posts under it; and the floor joists run perpendicular and sit on this beam.

I'm leaning towards installing ditra under the tiles. Yay or nay?

I'll be installing 12 by 12 porcelain tiles (see attachement, right one is top of tile and left one is bottom), what size trowel should i use for this tile?

What size of gap between tiles should I use?

Any recomendations on a grout color?

How do you finish the ends that are next to the walls? I read that you can purchase caulking that matches the grout, is this where it would be applied?

Is there any other questions that I should be asking or any info that I'm missing?

Thank you all for your time

Bud Cline 10-04-2011 01:56 PM

Use DITRA if you wish, it's a good product and serves a purpose.
Otherwise use cement board.
Trowel: 1/4" X 3/8" X 1/4".
Typical grout gap these days is 3/16".
Room perimeter requires a 1/4" gap all around for expansion.
At the tub a 1/8 gap will suffice, then caulk it.
Caulk is used at all changes in plane and changes in material construction.
Use unmodified thinset for the tile if using DITRA.
Use modified thinset for installing the DITRA over the plywood.
Use modified thinset for installing the tile over cement board.
Use unmodified thinset for installing the cement board.
Yow I know...confusing.:)

Fields31 10-04-2011 02:32 PM

Thank you for the response, I'm assuming that the trowel is a square notch not a v notch?

Bud Cline 10-04-2011 02:35 PM


I'm assuming that the trowel is a square notch not a v notch?
YES yes yes yes yes yes! A square notched trowel or a "U".:) Not sure how those dimensions would fit a "V" notched trowel, I'll have to think about that for a while.:)

bluebird5 10-08-2011 09:02 PM

why add 3/4 ply? do you want to raise the floor that much?

Fields31 10-08-2011 10:03 PM


Originally Posted by bluebird5
why add 3/4 ply? do you want to raise the floor that much?

To match the floor height outside the bathroom

bluebird5 10-08-2011 10:04 PM

but then when you add your ditra and tile you will be higher than the existing floor right?

Fields31 10-08-2011 10:12 PM

The 3/4" matches the sub floor height outside, and the height of ditra is small 1/8". The tile should match up cls to the laminate outside the bathroom.

bluebird5 10-08-2011 10:25 PM

ok well i did not realize that you had 2 layers of subfloor outside of the bathroom also.

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