Residential Building Inspector B1General Administration, Legal, and EnforcementMedium
A residential building inspector is conducting a final inspection for a new single-family residence. During the inspection, the inspector observes that the attic access opening, while present, is only 18 inches by 20 inches. According to the 2021 IRC, what is the minimum clear opening dimension required for an attic access opening?
- A22 inches by 30 inches
- B24 inches by 24 inches
- C30 inches by 30 inches
- D20 inches by 20 inches
Show answer & explanationAnswer & explanation
Correct answer: A. 22 inches by 30 inches
The 2021 IRC, Section R807.1, specifies that where an attic is provided with an access opening, the opening shall be a minimum of 22 inches by 30 inches and shall be located in a hallway or readily accessible area.
Why the other options are wrong
- B. 24x24 inches is larger than the minimum but not the specified minimum dimension.
- C. 30x30 inches is larger than the minimum but not the specified minimum dimension.
- D. 20x20 inches is smaller than the minimum required by the IRC.
Attic Access Minimums
The minimum required clear opening dimensions for an access to an attic space, as specified by the IRC, to allow for maintenance or inspection.
- Required for attics with sufficient headroom.
- Must be located in a readily accessible area.
- Specific dimensions ensure practical access.
Memory trick: Access '22' to '30' for 'Attic's' 'Entry'.