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Old 03-26-2009, 10:05 PM   #1
jbs
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Level vs Flat

Correct me if I'm wrong but I figure a quality tile job is more about having a flat floor rather than a level one. I'm wondering how flat is flat enough to have a good looking result. I'm guessing that it will depend on the size of the tile, the spacer size and the span of the floor. At some point trying to get the floor any flatter is probably overkill since you can compensate to some degree with the thinset. My question to all the Pros is do you have some rough guideline as to how flat a floor you like to have? (eg if you are laying 18" tile with a 1/16" spacer in a 4x6 bathroom 1/8" variation is too much but if you are laying 12" tile with a 1/4" spacer in a 12'x25' room 1/8" variation is tolerable)

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Old 03-26-2009, 10:18 PM   #2
Tool Guy - Kg
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Jason,

You're right about flat being most important.

The industry standard is to start with a substrate that's within 1/4" of being flat over the course of 10' and no more than 1/16" in 1'. In other words, a 10' straight-edge on the floor checked in any orientation would have no more than 1/4" of space under it anywhere along it's length. And a 1' straight-edge would have no more than 1/16" space under it. Starting out with a floor at least this flat allows you to make up for the slight differences with mortar to keep lippage under control. But the flatter the floor is before you start tiling, the flatter the final product will be.

Realize that the bigger the tile, the flatter the floor has to be to keep lippage under control. With those 18" tiles (if that's what you are using) and tight grout lines, I'd do everything I could to get it well within 1/8" of flat over the course of 10'.
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Old 03-27-2009, 12:09 PM   #3
Shpedly
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Agree with Tool Guy, the bigger the tile the flatter you want that subfloor. Most around here will probably agree that theres no such thing as a floor thats too flat.
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