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How to install egress windows

We have a 55 year old home and the foundation is solid concrete - not cinder block. The window size we wish to install is 48x48 inches slider type. We are struggling with the way to cut the foundation and what the size dimensions should be including the frame for the window.

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Measure the window from side to side and from top to bottom on the very outside of it. Those are your rough-in measurements. You can either cut that size and add one inch to the side length and 1/2" (inch) to the vertical measurement. That will leave you enough room to slide it in and put it where you want it and then use shims on three sides to hold it in place. shim it on three sides inside and outside of the window, cut the shims off even where they stick out past the window and then you can glue some trim on it. You should also put liquid nails down on the bottom shelf where the window will set, don't need a lot of it, just enough to hold it in place. I should have mentioned this before i started the answer, but you usually put in a header above the window to protect the window from being crushed if the weight above it starts to fall for some reason. If the concrete above the window is in good shape and no big cracks in it then you should be able to sneak by without the header since it is all solid. to cut the hole correctly, first drill four holes all the way through the concrete right where each corner is going to be, & then just cut from one hole to the other hole at the outside line. You will have to make the lines on both sides of the wall from hole to hole to hole to hole on all four sides and cut from both sides. If you run into any problems get a hold of me here and I will do everything I can to help you out. Good luck.

Posted on Jul 15, 2010


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