Leveling screws under tiles?

Old 02-11-21, 04:41 PM
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Leveling screws under tiles?

I've done this a few times with no adverse effects so far, but thought I'd throw it out here and ask.
The last hearth I tiled, I used 12" square marble tiles with a high gloss finish. Formerly a machinist, I'm picky lol and I can't stand it when light hits the glossy tiles and they are all reflecting different.
The last tiles actually varied in thickness, making things even worse. I ended up driving fine thread drywall screws into the cement board in a 10" square pattern under each tile to level them out until I was happy with them, and then smeared grout all over and pressed the tiles down until they were seated on all four screws and in the grout.
It looked great and it endured a lot of firewood and people sitting on it for about 5 years when we sold the house. If this was done in an entry way or shower with higher foot traffic, would I have to worry about the tiles cracking or anything bad happening?
Old 02-12-21, 05:40 AM
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You would not want to be driving screws in a shower as that would put holes in the waterproof membrane.

Masons accomplish the same by simply setting the tiles in the mortar. More mortar where a tile needs to be held higher. Tapping with the trowel gently works the tile down into the mortar (lowering it) so fine adjustment is quite easy and it's a much faster method.
Old 02-12-21, 07:17 AM
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They already beat you but these are from the top, much easier!


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