"Accessible Shower Floors: Threshold, Slope and Grate" is lesson 5 of 7 in the Tile (C-54) Learning Hub. It opens with "What the Tile Setter Controls" and works through 5 short steps, then a worked example you can check yourself against.
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The worked example in the course applies this lesson to a realistic job in 6 steps, from "Express the slope as a ratio" through "Check the drain".
2025 CBC Section 11B-608 covers shower compartments in public buildings, public accommodations, commercial buildings and public housing. The tile setter's work shows up in four things the section prints: the threshold height, the floor slope, the floor surface, and the drain grate. Get the mortar bed wrong on any of these and the shower fails inspection even if the plumbing is perfect.
11B-608.2 prints three sizes. A transfer-type compartment is 36 inches by 36 inches clear inside, with a 36 inch wide entry on the face. A standard roll-in compartment is 30 inches wide minimum by 60 inches deep minimum with a full opening on the long side, with a 36 by 60 inch clearance outside the open face. An alternate roll-in compartment is 36 inches wide by 60 inches deep minimum with a 36 inch entry at one end of the long side. Your bed and tile must not shrink these clear dimensions.
The remaining 3 steps, the worked example and the quiz are in the course. This is a preview. The full lesson, with the step-by-step explanations, a worked example and a quick-check quiz, is inside the classroom.
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