What to fill the voids in the tiles on the porch?
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Due to shoddy work, almost all of the steps are lined with voids. How to get out of this situation? The tiles are very expensive.
Answers
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This is a significant defect. It seems to me that the only way out is to dismantle and reinstall.
As you wrote above – completely redo.
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Buy expanded concrete, drill holes in the joints and try to foam. No guarantee it will work, but if the tiles are expensive, as an option to save yourself from a complete redo.
39_4 Cerezite has a repair compound (I think CX-15), very strong, does not shrink, but does not hold on vertical surfaces. Maybe you can fill the voids...
