Attic Egress Window Requirements

The clear opening must add up to 5 7 square feet.

Attic egress window requirements.

It states that all egress windows must have a minimum width of 20 inches a minimum height of 24 inches minimum clearing of 5 7 square feet when opened and maximum sill height of 44 inches from the floor. Since the staircase to the attic can act as a chimney for the fire to quickly spread it s necessary to have a secondary point of egress or exit. Attic egress openings must. The minimum opening area of the egress window is 5 7 square feet.

Attics that meet the size and ceiling height criteria of the habitable attic definition in chapter 2 are considered habitable. Since you re below ground you have to make sure that the window can still fully open without obstruction. This would imply that some egress windows are expected to be more than 15 or 20 ft. The minimum egress window opening height is 24 high.

Basement egress windows have special requirements. Having said that there are some broad standards dictated by the international residential code irc. The egress window must have a glass area of not less than 8 of the total floor area of room s for which it is servicing to allow the minimum amount of sufficient natural light. Irc r310 1 requires all sleeping rooms to have emergency escape and rescue openings however i think the irc is limited to 3 story residences.

The base of the well can be no more than 44 inches above the bedroom floor. Ibc 1029 1 requires sleeping rooms below the 4th story to have emergency escape and rescue openings. To qualify a basement window as an egress you may also have to install window wells to enlarge windows and allow access. The window must open a minimum width of 20 inches.

The trickiest part is the window egress. Have a minimum net opening area of at least 5 7 square feet. Attics are the worst place to be in a fire because heat and fire rise rapidly. Have an egress point.

Please be aware of the definition and egress requirements of a habitable attic as it relates to dwellings built from the 2012 irc. The 2009 and 2015 irc verbiage is similar and still applicable. The minimum egress window opening is 20 wide. Make sure the basement window well has enough area to move around in and if the well is especially deep make sure you have a ladder attached to it for an easy.

When a door is being used to meet the egress requirements it must be either a side hinged door or a slider. If the sill is below ground the window itself will need larger dimensions 9 square feet. The window must open a minimum height of 24 inches. Egress laws that call for at least one window in these rooms typically require the following.