Minimum Egress Window Size Massachusetts

Our egress window styles include the following.

Minimum egress window size massachusetts.

R310 1 2 minimum opening height. Minimum 24 inches of net clear height opening. Grade floor openings shall have a minimum net clear opening of 5 square feet 0 465 m2. Whatever the combination it must meet the minimum area.

Minimum 20 inches of net clear width opening. Means of egress pdf 63 99 kb this is part of. According to the 2018 irc all windows that are more than 6 feet above the grade outside the window must have a bottom opening a minimum of 24 inches above the room s interior floor. 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 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. The minimum net clear opening height shall be 24 inches 610 mm. In addition the egress window requirements for basements specifies that they be at least 36 inches in height and width with a fully functioning opening. The window sills are no more than 44 inches above the floor with 42 inches as the target height.

High and 20 in. Eighth edition of the ma state building code 780. 1025 2 6 2 door hardware markings. The minimum egress window opening is 20 wide.

Thus the product of the opening width and height must be at least 5 7 square feet or else it is not an egress window. The clear opening is at least 20 inches wide by 24 inches high with a minimum net clear opening of 5 7 square feet or 5 square feet for ground floor windows. Means of egress open pdf file 63 99 kb for chapter 10. It must be at least 5 7 square feet that is at least 20 inches wide by 24 inches high with an opening no higher than 44 inches from the floor.

Maximum 44 inches to window sill measured from finished floor. Downloads for 780 cmr chapter 10. The minimum egress window opening height is 24 high. Note that a window opening that s the bare minimum of 24 in.

All emergency escape and rescue openings shall have a minimum net clear opening of 5 7 square feet 0 530 m2. The exitsymbol shall be not less than 4 inches 102 mm in height and shall be mounted on the door centered horizontally with the top of the symbol not higher than 18 inches 457 mm above the finished floor. For ground floor windows this requirement is only 5 square feet. Exceptions can be made for windows that do not open more than 4 inches or that have window guards or opening control devices in compliance with astm f2090 17.

A window has to be taller and or wider than these minimums to meet the 5 7 sq ft opening requirement.