Bathroom wet-area tile — tub surround (66 sf) vs. walk-in shower (77 sf) unfolded
A wet-area preset is three alcove walls unfolded: a 5′ back wall + two 3′ end walls = 11 LF of tile. Height sets the rest — a tub surround tiled to 6 ft is 11 × 6 = 66 sf; a walk-in shower tiled to 7 ft is 11 × 7 = 77 sf. This tiled area feeds the wall-tile calculator and is deducted from paint.
What this diagram shows
Two side-by-side elevations of a tiled alcove with its three walls unfolded into one run. The run is a 5-foot back wall plus two 3-foot end walls, which is 11 linear feet of tiled surface in both cases. The difference is height: a tub surround is tiled to 6 feet, so 11 times 6 equals 66 square feet of tile, while a walk-in shower is tiled to 7 feet, so 11 times 7 equals 77 square feet. This tiled square footage is what the composer routes through the wall-tile calculator, and it is also the area subtracted from the paintable wall so paint is not over-bought.
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