Today I laid tile in a 25sq ft bathroom with a concrete subfloor. The concrete had a slight "bow" to it, meaning if you hold a straight edge across the 5' width, there is a gap of about 1/8" in the center. The tiles pretty much follow that slight curve. Will this cause any problems with cracking? If it matters, the tiles are 12" squares, inexpensive ceramic.
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What kind of load (traffic) do you expect there?– Peter IvanCommented Jul 15, 2013 at 8:41
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2 Answers
Nah. You are good to go. Tiles will crack if they bear weight over an unsupported spot. The bow in itself is irrelevant.
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1/8" (c. 3mm) is small enough that you can even let the thinset mortar be thicker in the center of the room, eliminating the bow with the tile layer.– Tim BCommented Jul 15, 2013 at 11:49
Did you use comb to comb the mortar? The most important is to have the mortar under the whole tile surface. The bow is not a problem then.
