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The tile spacing you should use will depend on the tile and where you’re installing it. Choosing the right tile spacers to maintain a consistent gap between your tiles is tricky. Generally, tile spacing shouldn’t be less than 2 millimeters on walls and 3 millimeters on floors because of stress relief requirements. Getting it wrong can result in uneven tiles and early repairs.

There are no unbreakable rules of design, but experts recommend against using large tiles in areas with poor subflooring where they’re more prone to cracking, in areas where the floor isn’t entirely level, over raised areas or dips, and in bathrooms where budget is the primary concern. The size of your bathroom shouldn’t be a reason not to use large tiles; in fact, larger tiles, also known as slab tiles, can be a modern and sleek choice for bathroom floors and walls.

Yes, you can tile a shower as a DIY project, and you can save hundreds of dollars in labor costs by doing so. However, you’ll need to rent or buy quite a few tools and supplies for the job, including a saw, tile nippers, and a new shower pan. In terms of the work itself, you should be prepared to tackle a variety of different tasks, including measuring and ordering materials, removing old tile, waterproofing the wall, adding rows of tile, grouting, and more.

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.