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You can technically install tile over tile, but we don’t suggest it. Installing tile over any surface that isn’t a completely flat and prepared subfloor will result in a shoddy overall job, uneven flooring, tiles that don’t adhere, extra weight, gaps, cracks, and room for moisture and dirt to enter. For the best results, only install new tile on a flat, sanded surface like subflooring or concrete that is prepared for tile.

If you have asbestos tile and would rather tile over it than remove it, or if your existing tile is completely flat and bonded tightly to the floor, you may be able to tile over existing tile. But experts recommend thinking twice before you do.

For professional labor and materials, it would cost between $6,000 and $28,000 to install 1,000 square feet of Saltillo tile flooring. If that’s out of your budget, you could consider laying the tiles yourself or choosing a less expensive type of flooring. For example, vinyl flooring costs just $2 to $7 per square foot, so for a 1,000-square-foot space, you’d pay $2,000 to $7,000.

When tiling over concrete, you should install an anti-fracture membrane after the concrete has been prepared. The anti-fracture membrane acts as a moisture barrier and should be installed to protect the tiles from moisture which helps maintain their integrity. Often, Ditra, a brand name, is used interchangeably with moisture barrier.

You should always use caulk instead of grout where the tile meets the wall. This will help your tile installation look great and last a long time. When you accidentally use grout for the corner seams, you end up making the tiles too rigid. So as the wall shifts over time, your tiles have no wiggle room. This can lead to tile damage, which will eventually require you to do at least a partial reinstallation.