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No, when done correctly, removing the tile shouldn’t damage the subfloor. However, if there was pre-existing damage to the subfloor from standard use or lack of maintenance, the subfloor may need repairs. For example, if the contractors notice mold growth on the subfloor or an uneven surface, you may need more extensive services before installing new tile.

If you DIY tile removal, remove the tiles one step at a time, individually removing the tile, grout, and mortar to prevent unnecessarily damaging the subfloor. Depending on the age of your home, consider having a professional inspect the subfloor to ensure it’s in good enough condition to lay new tile.

Figure out how much tile you need by measuring the backsplash area. Measure the height and length in feet and multiply to get the square footage. Don’t make adjustments for outlets or small cutouts but subtract the square footage for windows or other large obstructions from the total. To account for waste, get 10% more than your calculation.

The number of boxes of tile you need depends entirely on the amount of tile in each box or case. Different manufacturers package their tiles differently, and boxes contain different amounts of tile depending on the size, shape, and material. Often, the amount of area that a case will cover is listed in the product description. To calculate the number of boxes you need, take the total square feet of the space and divide it by the number of square feet the box will cover.

A cement backer board is not needed for laying tile on concrete. Sometimes referred to as a cementitious backer unit, or CBU, backer board should be used if the subfloor is plywood or OSB. The backer board provides a base on which to install the tiles that isn’t as likely to be damaged by any accidental water seepage as natural materials would be.