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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.

Porcelain is a relatively affordable, mid-range countertop material. It typically costs between $50 to $70 per square foot.

Compared to quartz, porcelain is slightly more affordable, as quartz generally ranges from $50 to $200 per square foot. However, lower-quality, builder's grade quartz can be similar in price to porcelain.

Compared to granite, the price can be similar, depending on the quality of the stone. While granite slabs can range from $50 to $200 per square foot, you can find lower-end granite in the same price range as porcelain. High-end granites will cost significantly more.

Porcelain is generally more expensive than laminate, acrylic, and ceramic, but less expensive than high-end slate, concrete, and marble. A key benefit is that porcelain does not require sealing, which reduces long-term maintenance costs.

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.

When working on your bathroom floor tiling, you should always tile the floor first and then refit the toilet afterward. This has both practical and visual advantages—the tile will have a better seal, and the installation will look cleaner.

On the other hand, when you try to cut the tiles to fit around the toilet, you’re putting yourself at a disadvantage. It’s a lot more work, it’s hard to be precise, and mistakes or miscalculations can lead to future moisture damage to the tiling, grout, and subfloor.