HO bought a replacement vinyl window which is intended to go inside the frame of an old aluminum window after the sash is removed. The wide exterior flange is meant to be caulked at top and two sides, making a water-tight seal to the existing stucco.
I’ve done several of those windows before, but this guy wants me to cut a hole in a wall where no window has ever been, frame out the RO and install his new window there.
I think I can make a pretty good seal at the top by liberally caulking the vinyl frame and pressing it tight to the underside of the upper saw-cut, then caulking the top edge of the flange. I’m more concerned about preventing water from getting in behind the house wrap under the window or along the sides if somehow the polyurethane caulk at the edge of the flange should fail.
Any suggestions?
Replies
Suggestion #1: Return the window and get a new construction window and do the job correctly, tying the flanges into the existing moisture barrier, then restucco at the perimeter.
Suggestion #2: Let someone else do the job and own the resultant mess.
Caulking The trim to the stucco is only temporary, and water may well be running behind the stucco when it rains, so it will leak, sooner or later.
Bill
Firstly, I agree with Bill. However, if you're going to do it..
When you do the cut out, add an extra 1-3/4" to the bottom for a sill. Flash the sill as normal and set the window on top of that.
~ Ted W ~
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