Tile Craft Fundamentals and Safety
Tile Craft Fundamentals and Safety
This domain tests the language of tile-ceramic vs. porcelain, absorption, finish, and trim-and the safety habits around cutting, handling, and jobsite housekeeping. Expect questions that ask you to classify tile from a specification or choose the correct hazard control.
Core rules
- Water absorption, tested by ASTM C373, sorts tile: non-vitreous >7%; semi-vitreous 3-7%; vitreous 0.5-3%; impervious <=0.5%. Porcelain is a dense, impervious body, but confirm the actual test value rather than relying on a label.
- Floor tile needs slip resistance and structural suitability; wall tile is selected for adhesion and finish. Do not substitute one for the other without checking the specification.
- Cutting tile with a dry grinder releases respirable crystalline silica. Use a wet saw or a grinder with water/HEPA dust extraction, plus eye protection, hearing protection, and a respirator rated for the exposure.
- Handle boxes with gloves and knee protection; keep walkways clear; control cords and water around wet saws; follow SDS instructions for mortars, grouts, and sealers.
Worked example
A specification lists a tile with 4.2% water absorption. That falls in the 3-7% semi-vitreous range, so it is not suitable for a continuously wet floor or exterior freeze-thaw exposure merely because it is called "ceramic." For a shower floor, select an impervious tile (<=0.5%) with suitable DCOF and a matching drainage slope.
Traps
Assuming "porcelain" always means any dense tile; dry-cutting indoors without dust controls; wearing only safety glasses when mixing mortar; and ignoring that wet saws still create slip and electrical hazards.