1. IRC 2009 Habitable Attics

2. Agenda
Definitions
Why designate space as Habitable Attic?
Requirements
Examples
Further help

3. Habitable Attic Definition
IRC Definition:
ATTIC, HABITABLE. A finished or unfinished area, not considered a story, complying with all of the following requirements:
1. The occupiable floor area is at least 70 square feet (17m2), in accordance with Section R304,
2. The occupiable floor area has a ceiling height in accordance with Section R305, and
3. The occupiable space is enclosed by the roof assembly above, knee walls (if applicable) on the sides and the floor-ceiling assembly below.

4. Why Designate Space as Habitable Attic?
Enables Designer to gain a 5th Floor while staying in IRC

5. Habitable Attic Requirements
Minimum floor area (70ft2)
Minimum ceiling height (5’ for > 50% of room)
Minimum floor loading (30psf Live)
Fixed stairway
Smoke alarm
Emergency egress window

6. Habitable Attic Examples
Bonus Rooms above a Garage
Any attic above a relatively wide house where the rafters create enough headroom & is serviced by a fixed stair

7. Habitable Attic – Further Reading
Pennsylvania Housing Research Center
Habitable Attics