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No, you don’t need to remove the old grout before installing new tile over existing tile. In fact, the old grout helps fill in gaps between tiles, creating a more even surface for the new layer. However, it's important to ensure that the grout is clean, solid, and free of cracks or crumbling areas. Damaged grout should be repaired or replaced before proceeding. Cleaning the surface thoroughly and filling any low spots will help the new adhesive bond properly and ensure a smooth, stable installation.

If you’re out of spacers for your tile installation, you can use pennies. Each time you place a tile, stick the pennies around the edges (on the sides and the corners). Like working with spacers, you’ll want the same amount of space around each tile before they set.

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.

The average cost for tile installation is about $2,000, with a typical price range between $500 and $6,500. On a per-square-foot basis, you can expect to pay between $5 and $45 for installation.

Several factors influence the total cost, including:

• Installation Site: Costs vary for different areas. Common project costs are: kitchen floor ($870–$6,100), countertop or backsplash ($500–$3,000), bathroom floor ($300–$2,400), or shower wall ($225–$2,000).

• Tile Type and Quality: The material significantly impacts price. For example, standard ceramic or travertine tile can cost about $1 per square foot, while luxury options like marble can be as much as $350 per square foot for the material alone.

• Project Size and Complexity: The total square footage, the complexity of the pattern, and the shape of the tile (e.g., square, rectangle, hexagon, mosaic) will affect labor and material costs.

• Site Preparation: The amount of prep work needed, such as removing old tile or installing a new subfloor or backer board, can add to the final price.

• Tile Characteristics: The tile's durability rating and porosity can also influence the price.

• Location: Labor rates vary by geographic location.