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We've added a small half bath to an addition, and we're planning to tile the floor ourselves even though we have never done it. The room is about 20 square feet and I'm planning 12" x 24" tiles, so 10 tiles total--how hard can that be? I know, probably much harder than I realize. Some questions:

1) Transition: The subfloor is OSB. We are planning to put down 1/8 inch Ditra (orange) underlayment, then 3/8 inch tiles. The tile will end up being between 1/16 and 1/8 inch higher than the adjoining bamboo floor depending on the thinset thickness. I would like to avoid a heavy marble or wood T threshold if possible for such a small gap. Could I use one of those Schluter metal vertical strips? If I do this, how can I be sure what height to get when the thinset thickness is hard to predict?

2) Leveling: I have read that I should get some sort of leveling system to make sure the large tiles lie flat, but they are awfully expensive--$80 or more for various components that I will use once for this small room. Any advice about how best to level the tiles?

3) Grout: Is stain-free grout best for floor tile? I have read that it can be much harder to work with and to clean off the tile as you're grouting.

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You need to get the schluter profile with the same thickness as your tiles. you don't need to account for the thinset because you will press the profile down on the thinset just like the tile.

That said, the T moulding has advantages. First, it hides imperfections. If you have several tiles at the transitions, it is very difficult to cut them to make a perfect straight line. Second if your bamboo flooring shrinks and expands, you need to leave a small Gap at the transition which can be covered by the T

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    Your question did not ask about adequate subfloor, OSB is not adequate subfloor for tile, typically you put down a layer of cement board to ensure that the floor has no or little flex to it. If your floor flexes you could end up having grout lines that break or even tiles that break. – Alaska Man Feb 9 at 21:01
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    @Alaskaman, it will break for sure. I would give it 3 months at most. The OSB flexing will destroy the tiles – Quoc Vu Feb 11 at 19:49

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