Minimum Attic Access Size

Openings through a perimeter wall shall be not less than 16 inches by 24 inches 407 mm by 610 mm.

Minimum attic access size.

The rough framed opening must be a minimum of 22 inches by 30 inches. Access openings through the floor shall be a minimum of 18 inches by 24 inches 457 mm by 610 mm. Where the access is located in a ceiling minimum unobstructed headroom in the attic space shall be 30 inches 762 mm at some point above the access measured vertically from the bottom of ceiling framing members. Tuesday january 28 2020.

If the access is located in the ceiling the minimum. When any portion of the through wall access is below grade an areaway not less than 16 inches by 24 inches 407 mm by 610 mm shall be provided. See the california mechanical code for access requirements where mechanical equipment is located in attics. For smaller attic openings with a minimum measurement of 18 x 24 you will need to measure the swing clearance inside the attic space.

Minimum opening size the 2012 international residential code requires an attic access opening for attics with an area greater than 30 square feet and a vertical height in excess of 30 inches. When the access is located in a ceiling minimum unobstructed headroom in the attic space shall be 30 inches 762 mm at some point above the access measured vertically from the bottom of ceiling framing members. The compact attic ladder requires a minimum height of 28 and minimum depth of 44 inside the attic above and behind the opening. See section m1305 1 3 for access requirements where mechanical equipment is located in attics.

The rough opening cannot be less than 22 inches by 30 inches and must be located in a hallway or other readily accessible location. What is the minimum size for attic access opening. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures.