Required Attic Access Size

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.

Required attic access size.

See section m1305 1 3 for access requirements where mechanical equipment is located in attics. The following are attic furnace installation requirements based on 2009 irc and 2009 imc the codes refer to it as appliances in attics. 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. 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.

See the california mechanical code for access requirements where mechanical equipment is located in attics. If the attic space is smaller than these specs then an access hatch is not required. An opening not less than 20 inches by 30 inches 559 mm by 762 mm shall be provided to any attic area having a clear height of over 30 inches 762 mm. Attic furnace installation must comply with you local mechanical code or imc international mechanical code if such was adopted in your area.

Attic furnace passageway and service area electrical requirement. The compact attic ladder requires a minimum height of 28 and minimum depth of 44 inside the attic above and behind the opening. The type of attic access determines the means you can install for entrance into the attic. For smaller attic openings with a minimum measurement of 18 x 24 you will need to measure the swing clearance inside the attic space.

The access opening should be located in a hallway or other readily accessible location and minimum 22 x 30. Solutions for the new code requirements r 42 attic access hatch exceeds all code requirements 22x30 pre finished white wood frame trim e zh t h triple gasketed air tight seal z hatch mark d. Attic furnace access passageway and platform. 2006 irc residential construction.