The rough framed opening.
The minimum size for an attic access is.
These specs are per r807 1 of the international residential code irc and the residential edition of the florida building code fbc.
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.
Buildings with combustible ceiling or roof construction shall have an attic access opening to attic areas that exceed 30 square feet 2 8 m2 and have a vertical height of 30 inches 762 mm or greater.
See the california mechanical code for access requirements where mechanical equipment is located in attics.
The compact attic ladder requires a minimum height of 28 and minimum depth of 44 inside the attic above and behind the opening.
The vertical height shall be measured from the top of the ceiling framing members to the underside of the roof framing members.
The vertical height shall be measured from the top of the ceiling framing members to the underside of the roof framing members.
Buildings with combustible ceiling or roof construction shall have an attic access opening to attic areas that exceed 30 square feet 2 8 m2 and have a vertical height of 30 inches 762 mm or greater.
Attic ceiling attic access panel shall be fully attic drop down stair shall be fully interface gasketed and insulated gasketed and insulated energy star does not supersede code requirements mark d.
The rough framed opening must be a minimum of 22 inches by 30 inches.
Building codes according to the 2006 international residential code r807 1 attic access homes with combustible materials in the ceiling and roof construction must have an access to attic areas that exceeds 30 square feet and with a vertical height of 30 inches or greater.
If the access is located in the ceiling the minimum unobstructed headrom above the opening must be 30 inches measured vertically at some point over the access.