I've been meaning to actually remove a window on the back wall of my shop for a long time now. It's sorta been "embedded" in the wall for awhile, but unfortunately that meant an essentially un-insulated space surrounding a window AC unit. A couple months ago I put a "nice" cover on the outside...today I deal with actually ripping out the window parts, framing a 6" wall properly, insulating and covering it with wall material similar to what surrounds the area. It was a good way to spend the time waiting for glue to dry on a small commission. :D
I forgot a "before" photo, but here are two others; one from about mid-project and the other at the end of the work. As you might notice, I embedded a 4" diameter pipe to serve as a pathway for the required connections for a planned Mini-Split system installation that's going to happen "real soon now". I can already feel the difference in that area...no more drafts. And in about a week, the ceiling will be insulated, too...material is ordered.
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It's interesting how the walls have changed color since they were installed in about 2000. Yup...pine darkens. (that's "thin" T1-11 type material) Looks like a farmer's tan! LOL