Residential Building Inspector B1Building Planning and Life SafetyEasy
A residential building inspector is performing a final inspection of a newly constructed single-family home. The plans indicate that the attic access opening is located in a hallway closet. What is the minimum clear opening dimension required for this attic access?
- A22 inches by 30 inches
- B18 inches by 18 inches
- C20 inches by 24 inches
- D30 inches by 30 inches
Show answer & explanationAnswer & explanation
Correct answer: A. 22 inches by 30 inches
According to the 2021 IRC, Section R807.1, attics with a clear headroom of 30 inches or greater are required to have an access opening not less than 22 inches by 30 inches (559 mm by 762 mm).
Why the other options are wrong
- B. 18x18 inches is too small for standard attic access.
- C. 20x24 inches is too small for standard attic access.
- D. 30x30 inches exceeds the minimum requirement, though it would be acceptable.
Attic Access Opening
A minimum-sized opening required to allow access to attic spaces for inspection, maintenance, or storage.
- Required when attic headroom is 30 inches or more.
- Must be located in a readily accessible area.
- Specified in IRC Section R807.1.
Memory trick: Attic access needs a clear path, 22x30, so you can climb.