Using thinset mortar in place of proper tile grout creates a series of major functional and aesthetic problems because thinset is designed purely for bonding, not joint filling. Thinset contains large sand and cement particles that create a rough, uneven texture, and it lacks the color consistency, flexibility, and anti-fungal sealants found in standard sanded or unsanded grouts. Once cured, thinset exposed in grout lines will easily crack, absorb moisture, collect dirt and stains, and crumble away under normal cleaning and foot traffic. Furthermore, it leaves the sharp edges of the tiles unprotected, severely compromising the structural longevity and polished appearance of the entire installation.
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