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Grout and caulk are commonly used together, especially in bathrooms. Grout goes between the tiles and keeps them sturdy and in place on the walls or floor. Caulk goes in corners or where two different materials meet (like where the bathtub meets the tile) to create a waterproof seal. However, they are not interchangeable—you shouldn't use caulk to adhere tile and shouldn’t use mortar if you need a waterproof seal.

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.

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 and ceramic tiles are made from clay, but porcelain tiles are fired in a kiln at a higher temperature. This makes them more durable, but it also means porcelain is more expensive than ceramic at $3 to $5 more per square foot.

Even with the higher price point, many people choose porcelain over ceramic because there are more color and design options.