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Yes, cracked tiles allow water to seep through the substrate or subfloor, leading to mold and mildew growth. It can also cause severe structural damage. At the very least, water damage can cause your tile to lift from the substrate, meaning one cracked tile can lead to several cracked tiles. It’s a good idea to waterproof tile in areas with direct water exposure or lots of moisture.

No, when done correctly, removing the tile shouldn’t damage the subfloor. However, if there was pre-existing damage to the subfloor from standard use or lack of maintenance, the subfloor may need repairs. For example, if the contractors notice mold growth on the subfloor or an uneven surface, you may need more extensive services before installing new tile.

If you DIY tile removal, remove the tiles one step at a time, individually removing the tile, grout, and mortar to prevent unnecessarily damaging the subfloor. Depending on the age of your home, consider having a professional inspect the subfloor to ensure it’s in good enough condition to lay new tile.

Glazed ceramic tiles don’t need to be sealed because the glazing already offers some protection against moisture. Unglazed ceramic tiles need to be sealed to keep the porous tile safe from moisture and staining. However, both types of tile can benefit from sealing. Sealant can make the tiles easier to keep clean and offer more resistance to water, spills, and stains.

Mortar and thinset both serve the same purpose—tile adhesion—but have different compositions and use-cases. Thinset is heatproof and presents a wide range of possibilities due to the added polymers. Mortar is typically used for bonding stones and brick. Thinset is rarely used outside, while mortar is rarely used inside.