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Code Excert:

SECTION R310

EMERGENCY ESCAPE AND RESCUE OPENINGS

R310.1 Emergency escape and rescue required. Basements,

habitable attics and every sleeping room shall have at least one

operable emergency escape and rescue opening. Where basements

contain one or more sleeping rooms, emergency egress

and rescue openings shall be required in each sleeping room.

Where emergency escape and rescue openings are provided

they shall have a sill height of not more than 44 inches (1118

mm) above the floor. Where a door opening having a threshold

below the adjacent ground elevation serves as an emergency

escape and rescue opening and is provided with a bulkhead

enclosure, the bulkhead enclosure shall comply with Section

R310.3. The net clear opening dimensions required by this section

shall be obtained by the normal operation of the emergency

escape and rescue opening from the inside. Emergency

escape and rescue openings with a finished sill height below the

adjacent ground elevation shall be provided with a window

well in accordance with Section R310.2. Emergency escape

and rescue openings shall open directly into a public way, or to

a yard or court that opens to a public way.

Exception: Basements used only to house mechanical

equipment and not exceeding total floor area of 200 square

feet (18.58 m2).

R310.1.1 Minimum opening area. All emergency escape

and rescue openings shall have a minimum net clear opening

of 5.7 square feet (0.530 m2).

Exception: Grade floor openings shall have a minimum

net clear opening of 5 square feet (0.465 m2).

R310.1.2 Minimum opening height. The minimum net

clear opening height shall be 24 inches (610 mm).

R310.1.3 Minimum opening width. The minimum net

clear opening width shall be 20 inches (508 mm).

R310.1.4 Operational constraints. Emergency escape and

rescue openings shall be operational from the inside of the

room without the use of keys, tools or special knowledge.

R310.2 Window wells. The minimum horizontal area of the

window well shall be 9 square feet (0.9 m2), with a minimum

horizontal projection and width of 36 inches (914 mm). The

area of the window well shall allow the emergency escape and

rescue opening to be fully opened.

Exception: The ladder or steps required by Section R310.2.1

shall be permitted to encroach a maximum of 6 inches (152

mm) into the required dimensions of the window well.

R310.2.1 Ladder and steps. Window wells with a vertical

depth greater than 44 inches (1118 mm) shall be equipped

with a permanently affixed ladder or steps usable with the

window in the fully open position. Ladders or steps required

by this section shall not be required to comply with Sections

R311.7 and R311.8. Ladders or rungs shall have an inside

width of at least 12 inches (305 mm), shall project at least 3

inches (76 mm) from the wall and shall be spaced not more

than 18 inches (457 mm) on center vertically for the full

height of the window well.

R310.3 Bulkhead enclosures. Bulkhead enclosures shall provide

direct access to the basement. The bulkhead enclosure with

the door panels in the fully open position shall provide the minimum

net clear opening required by Section R310.1.1. Bulkhead

enclosures shall also comply with Section R311.7.8.2.

R310.4 Bars, grilles, covers and screens. Bars, grilles, covers,

screens or similar devices are permitted to be placed over

emergency escape and rescue openings, bulkhead enclosures,

or window wells that serve such openings, provided the minimum

net clear opening size complies with Sections R31 0.1.1

to R31 0.1.3, and such devices shall be releasable or removable

from the inside without the use of a key, tool, special knowledge

or force greater than that which is required for normal

operation of the escape and rescue opening.

R310.5 Emergency escape windows under decks and porches.

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 h

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Commerce City, CO 80022-2243

 

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