Common tiling mistakes that can ruin a project include failing to properly prep and flatten the subfloor, skipping back-buttering for large-format tiles, and neglecting to use tile spacers for uniform grout lines. Another major error is mixing thinset incorrectly, such as adding too much water or failing to let the mixture slake, which severely compromises its chemical bonding strength and structural integrity. Installers also frequently forget to leave expansion joints around room perimeters or fail to clean excess mortar out of grout joints before it cures hard. Rushing the curing process by walking on the floor too soon or applying grout before the thinset has fully dried will almost certainly result in loose tiles and cracked grout down the road.
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