It is advisable to wait a minimum of 28 days before tiling over newly poured concrete. This is because concrete needs time to cure and dry, allowing it to reach its full strength and prevent the tiles from cracking or coming loose over time. Once the waiting period has passed, the concrete surface should be thoroughly cleaned to remove any debris, and a primer or bonding agent may be necessary to ensure proper adhesion of the tiles. Following manufacturer instructions and consulting with a professional can help ensure a successful installation.
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You can tile over a new concrete after at least three days after which it has dried.
You can tile over existing tile although it isn't reccomended. You would be safer by removing the tile and then installing the new tile. But, if you wanted to tile over existing tile you would have to make sure all the tile is even and not lose. If the tile is lose or uneven it will caused the new tile and grout to crack or pop out.
It is possible but I would not reccomend it. If possible remove the old tile before laying the new tile. If you want to avoid removing the old tile you can lay a cement board over the old tile before installing the new tile.
The first thing you want to do is be sure that the original tile is secure and even. If it is loose, or uneven the new tile may pop out or crack under normal wear and tear. If it is uneven or unsecure you can lay a sub-floor to give the new tile a even base.
you can hide some leveling issues with the grout, but if it's really noticeable then the surface wasn't leveled out first (self-leveling concrete) or the person laying the tile didn't know what he was doing. the good thing about tile is that you can chip out the bad area, reset new tile and re-grout to fix it. you don't have to tear out the whole room or counter
If its new VCT probably, and you will need to strip the old wax & rinse good so there is no stripper residue.. it eats your new wax over time.... If it ceramic tiles NO.