I'll try to make this story brief. About 1.5 years ago, my kitchen window started leaking between the panes (12 years old now, vinyl, awning style). I went to Menards and got talked into a replacement window (vinyl, sliding style).
Those in-the-know probably already know that I can't fit this window into the existing vinyl frame. So either I have to build a new frame for it from scratch, or start all over with a new-construction window. I've been putting this off for so long, because of this conundrum. If I don't get to it soon, my wife may murder me in my sleep.
It's a Jeld-Wen vinyl replacement window from Menards, low-e glass and white grate between the panes. It was almost $200, and the length of time I procrastinated prevents me from exchanging it (with restocking fee) for a New Construction style window. This leads me to want to build a frame for it, but having never done that, I am apprehensive.
Got a picture of the inside and outside so we can see what's going to be involved?
Need to know what type siding you have mainly.
Trying to make a replacement window work and not leak is going to be a real challenge.
Just no good way to seal the outside with no nailing fin.
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Yeah, that's what I'm afraid of. I've read a few things where people say they exclusively use replacement windows and build frames for them, using 1x6 & 1x2 (wood or vinyl). I'm not sure how to execute that and get a good seal - like you said, not getting it to leak may be difficult.
The siding is standard vinyl, constructed in 2002. I'll try to snap a few pictures later when I'm back at home.