Residential Building Inspector B1Public Safety and Special ConstructionMedium
A residential garage is being constructed with a floor that is required to be sloped to a drain. What is the minimum permissible slope for the garage floor?
- A1/2 inch per foot
- B1/8 inch per foot
- C1/4 inch per foot
- D1 inch per foot
Show answer & explanationAnswer & explanation
Correct answer: B. 1/8 inch per foot
Garage floors that are required to be sloped to a drain, such as those with a floor drain or where vehicles are parked, must have a minimum slope of 1/8 inch per foot (10.4 mm/m). This ensures proper drainage of liquids and prevents pooling.
Why the other options are wrong
- A. This slope is excessive for a garage floor and not required.
- C. This slope is common for shower pans or other wet areas, but not specifically the minimum for garage floors.
- D. This slope is far too steep for a garage floor and not required.
Garage Floor Slope
The minimum gradient required for a garage floor to ensure proper drainage to a floor drain.
- Applies to garage floors with drains
- Minimum 1/8 inch per foot (10.4 mm/m)
- Prevents water pooling
Memory trick: A garage slope, just an eighth, keeps water at bay.