Increasing height is often only a matter of lowering the height of the sill below the window.Windows Management Framework (WMF) 5.0 brings functionality that has been updated from WMF 4.0. Increasing width might mean installing a larger, beefier horizontal structural header over the window opening - a major project. If you're replacing a smaller window with a larger one that meets egress requirements, bear in mind that enlarging the height of the opening takes less structural work than enlarging the width. Bars, grilles and grates may be installed over windows but must be operational without tools or keys and still allow the minimum clear opening. The window opening must be operational from the inside without keys or tools. Maximum sill height above floor: 44 inches.The salesperson who sells you the window should be able to help you select a code-compliant window, provided he/she knows you need an egress window. Nearly all window manufacturers specify which of their windows meet national egress requirements right in their catalogs and list the net free opening of their windows. It is not the rough opening size or the glass panel size, but the actual opening a person can crawl through. Refers to the actual free and clear space that exists when the window is open. Minimum net clear opening: 5.7 square feet (5 square feet for ground floor).Likewise, a 24 inches high window would have to be 34 inches wide. To achieve the required net clear opening of 5.7 square feet, a 20 inches wide window would have to be 42 inches high. However, those dimensions would yield a net clear opening of only 3.3 square feet. An egress window must satisfy four International Residential Code (IRC) criteria:Īt first glance, you might assume that a 20 inches by 24 inches window would be acceptable for egress.
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