A shower floor must slope 1/4 inch per foot to the drain. What fall is needed over 4 feet?
Correct Answer
A) 1 inch.
At a quarter inch per foot, 4 feet requires 1 inch of fall.
Why This Is the Correct Answer
At a quarter inch per foot, 4 feet requires 1 inch of fall.
Why the Other Options Are Wrong
Option B: 1/2 inch.
1/2 inch. is not aligned with the supported result for tile slope calculation; it has the wrong label or classification even if the number looks close.
Option C: 2 inches.
2 inches. is above the supported result for tile slope calculation; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Option D: 4 inches.
4 inches. is above the supported result for tile slope calculation; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Memory Technique
Tile Slope cart for Checking Shower: quarter first, controlling second, whole the controlling choice last.
Reference Hint
Study anchor (closed-book): memorize Tile slope calculation from California Residential Code, California Code of Regulations Title 24. / Title 24 California Residential Code shower receptor slope concepts; know the rule or calculation trigger without relying on exam-room lookup.
More Class B Trade Questions
A 2-inch horizontal sanitary branch must be installed at 1/4 inch fall per foot. What total fall is needed over a 24-foot run?
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