Smallest Egress Window Size

Ringer windows casement window systems.

Smallest egress window size.

What is the minimum size for egress windows. The nbcc details specific size requirements as. The clear opening of the egress window is designed for access out of the house in an emergency situation. Window wells greater than 44 inches in depth requires a permanently fixed ladder or steps to provide access.

The window s sill must not be highers than 44 inches from the floor. The overall size of this smallest egress casement window is 8 sq. Window wells serving an egress window shall not be less than 9 square feet in area with a horizontal length width of no less than 36 inches. The minimum height requirement of the opening is 24 inches.

Also remember that the sill can t be more than 44 above the floor so you may end up with a taller window for a head height over 6 8. For replacement windows a minimum opening size of 5 0 square feet must be met. Casement windows with hinged sashes that swing free and clear of the opening can be relatively small and still meet egress requirements. In accordance with the irc requirements the minimum width of the egress window opening is 20 inches.

Interestingly enough when 20 width and 24 height is converted into a square foot opening size these minimum opening dimensions together do not meet the minimum 5 0 or 5 7 square feet for egress for small windows sizes. Unobstructed opening of not less than 0 35 m2 3 77 sq ft in area with no dimension less than 380 mm 15 inches this window should maintain the required opening during an emergency without the need for additional support. The minimum egress window opening height is 24 high. The minimum opening area of the egress window is 5 7 square feet.

Windows referred to above shall provide unobstructed openings with areas not less than 0 35 m2 3 8ft2 with no dimension less than 380 mm 15 in. 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. Casement windows are minimally 2 4 wide by 3 4 high. Reliabilt 105 series 35 5 in x 59 5 in vinyl egress new construction white single hung window.

For many casement windows you ll need to order egress hardware which allows the window to not only swing open but also swing away. Let s have a look at the alberta building code abc 2014 criteria that all egress windows must satisfy. For determining egress window sizes and placement the international building code holds that every bedroom must contain at least one egress window.