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.
Minimum attic access panel.
Buildings with combustible ceiling or roof construction shall have an attic access opening to attic areas that have a vertical height of 30 inches 762 mm or greater over an area of not less than 30 square feet 2 8 m 2.
Tuesday january 28 2020.
See section m1305 1 3 for access requirements where mechanical equipment is located in attics like 1.
The rough opening cannot be less than 22 inches by 30 inches and must be located in a hallway or other readily accessible location.
See section m1305 1 3 for access requirements where mechanical equipment is located in attics.
What is the minimum size for attic access opening.
The vertical height shall be measured from the top of the ceiling framing members to the underside of the roof framing members.
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 rough framed opening must be a minimum of 22 inches by 30 inches.
If the opening is located in a wall the 30 inch dimension must be vertical.