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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.

Yes, your shower pan goes underneath your tiling and helps prevent excess water from seeping into the floor. Without the shower pan under your tile, water will seep through the grout and into the flooring. This will eventually lead to mold growth and serious water damage that could cost thousands of dollars to fix.

It’s easiest to start from an edge as it gives you a straight line. A problem may arise if your edge doesn’t line up perfectly, in which case it’s best to start from the center. Some think that starting tile from the center adds a focal point in the center of the hearth. 

Penny tile should be sealed to protect the grout from moisture and keep stains from damaging the look of the tile. If penny tile is in a humid or high-traffic area, like a bathroom, kitchen, or entryway, it needs sealant. Any type of tile and grout is best maintained with a sealant reapplied by a pro every one to two years.