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digthisbigcrux 03-25-2007 06:10 PM

Math for egress window clearance
I'm cutting an egress window into my foundation and am trying to figure out the difference between rough sill height and finished sill height. I figured about 4". Is that about right? (I need to know because the floor to bottom of the finished sill can be only 44" with a max 7" riser.


jiggyjack 03-29-2007 09:30 PM

It's basically just math.

Figure you will frame wood 2x around the perimeter of the window.

Then you want at least 1/4 inch space between the window framing and the window jamb bottom.

So add 1 1/2 inches for the framing and add 1/4 inch plus the actul thickness from the bottom of the jamb to the top of the sill, and thats the number that you subtract from 44" to get a location to cut the rough opening.

Keep in mind that 44" is max. height so if in doubt go a little lower than you think you need to be.

Good luck.

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