Windows Installation: How to fill gaps?


Old 09-04-14, 10:32 AM
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Windows Installation: How to fill gaps?

Hello. I just had windows (professionally?) installed. They look good and seem to fit from the outside, however, I am concerned about the inside where the windows seem too small leaving gaps (e.g., please see attached photo). I have 9 windows in total with this same issue. I am wondering what needs to be done before the trim goes on. Any advice would be much appreciated!
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Old 09-04-14, 11:46 AM
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You need to make an extension jamb. Put the 4 sides together like a box. Make the outside-outside measurement about 1" bigger than. the width x height of your window. Shim and nail it to the rough opening, flush with the wall surface. Then when you have a gap where that jamb and the window meet, trim that on all 4 sides with a base shoe moulding, pushed tight to the window.

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