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The International Residential Code 2000 stipulates the following for windows below ground level:
Window Wells/Area Wells:
- Required where window opening sill height is below ground elevation.
- Horizontal dimensions=9 square feet (width x projection). Horizontal projection=36 inches.
Windows:
- Sill height of window above floor: Not to exceed 44 inches.
- Minimum opening area=5.7 square feet.
- Minimum opening height=24 inches.
- Minimum opening width=20 inches.
Ladders:
- Required on window wells deeper than 44 inches and must be permanently attached.
- Ladder may encroach into well up to 6 inches.
- Step distance between rungs=18 inches.
- Rungs: 12 inches wide or greater and must project a minimum of 3 inches away from wall but maximum of 6 inches.
Grates:
- Shall be removable without special tools.
Under Decks:
The International Residential Code 2006 stipulates the following for basement egress windows under decks:
Emergency escape windows are allowed to be installed under decks and porches provided the location of the deck allows the emergency escape window to be fully opened and provides a path not less than 36 inches (914 mm) in height to a yard or court.
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