Irc Attic Access Requirements
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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.
Irc attic access requirements. The rough framed opening shall not be less than 22 inches. Buildings with combustible ceiling or roof construction shall have an attic access opening to attic areas that exceed 30 square feet 2 8m squared and have a vertical height of 30 inches 762 mm or more. 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 rough framed opening of the attic access shall be not less than 22 inches by 30 inches 559 mm by 762 mm for you canucks. The following are the requirements taken directly from the irc. See section m1305 1 3 for access requirements where mechanical equipment is located in attics. 2006 irc residential construction.
Roof construction an attic access opening shall be provided to attic areas that exceed 30 square feet 2 8m2 and have a verti cal height of 30 inches 762 mm or greater. A fixed stair or ramp is required on an attic that meets the habitable attic criteria unless a door directly to the exterior is installed in the space. Vertical access can be a fixed internal stair ramp or exterior stair. This section makes it very clear.
Attic access requirements after getting help from an internachi inspector we ve come up with irc r807 1 attic access. Attic area exceeds 30 square feet and minimum vertical height of 30 inches measured from the top of the ceiling framing members to the bottom of the roof. 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. Enclosed attics and enclosed rafter spaces formed where ceilings are applied directly to the underside of roof rafters shall have cross ventilation for each separate space by ventilating openings protected against the entrance of rain or snow.
The vertical height shall be measured from the top of the ceiling framing members to the underside of the roof framing members.
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