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Grouting hearth tiles is one of the most important steps. It seals the tiles so heat doesn’t transfer under the tiles so easily, which can be dangerous. For this reason, heat-resistant grout is a must. Grout also prevents dust, dirt, and any other material from gathering between your tiles. If this happens and those buildups are flammable, a fire could start between the tiles. 

When cleaning porcelain tiles, avoid products that contain ammonia, bleach, and other harsh chemicals. Acid-based cleansers can damage the tile, though you can clean them with a diluted mixture of one-quarter cup white vinegar mixed with one gallon of hot water. It is important always to use a soft-bristled brush or sponge, since hard bristles and steel wool can scratch the tile.

To ensure an even and unbending surface to lay tiles on, you’ll typically need to put a subfloor under a tile floor. Fiber cement backboards are the most common choice, but using plywood is also possible. Don’t neglect this step, or you could risk water damage and grout or tiles prematurely cracking or crumbling, especially in an area with high foot traffic. 

Yes, you can tile over existing tiles in a bathroom, but it is not always recommended. For this method to be successful, the original tile surface must be clean, flat, and free of damage such as cracks, unevenness, mold, or mildew. While tiling over existing tiles can save time and money, there are potential drawbacks. The new adhesive may not bond properly, and the process adds extra weight to the wall or floor. Additionally, the increased height of the surface could interfere with door clearances. For the best and most durable results, removing the old tiles before installing new ones is generally the better option.