Highly porous, unsealed natural stone tiles like travertine, limestone, and marble, as well as soft wall-grade ceramic tiles and low-fired porous terracotta, should never be used inside a wet shower enclosure. These materials absorb moisture rapidly, leading to mold growth, water degradation, staining, and eventual structural failure. Furthermore, glossy smooth ceramic or porcelain tiles lacking adequate slip-resistance ratings should be strictly avoided on shower floors due to extreme slip-and-fall safety hazards.
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