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The underlayment determines a ceramic tile’s sturdiness, and a cement board or backer board works best. Be sure to tape the joints when using these materials, and consider laying it on top of a layer of thin-set for more stability.

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.

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.

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.