Attic, habitable

A habitable attic is a habitable space located directly under the roof. Habitable attics have no exterior walls. Interior walls, if any, are knee walls between the rafters above and the floor below. An example of a habitable attic is an attic area that is accessible by permanent stairs. A habitable attic is not considered a story so it does not add to the number of stories above grade and it does not place additional load requirements on the supporting framing. A habitable attic is designed as a sleeping area for determining floor joist spans. A habitable attic must have the minimum floor space (70 square feet) and minimum ceiling height as required in Sections R304 and R305.