Window blind stop repair

[Bacho]

I’m installing replacement windows in my 1950 house. I’ve come across a handful of instances of the blind stop being short, or rotten at the bottom. I understand for a house of vintage, this piece cannot be removed very well on its own. I’m not finding a whole lot on the Internet of what to do about it though. Should I try and cut some sort of extension piece?

Wait until the windows installed and when replacing the exterior trim and try to address it then?

 

[71PA_Highboy]

Pull the aluminium cladding then cut it out/replace it..

 

[Here4memes]

I just did my house last year with exactly all of this going on...

I made it easy. The front piece under the trim that's rotted, pull trim outwards, cut wood straight with oscillating tool past rot and add back the same dimension wood with wood glue or nails or screws if possible.

The front hole where the old rollers were should be covered by the window. If so ignore.

Install windows. I prefer to just use 2 screws into each side at this point.

push aluminum trim back and nail it back to cover the new wood on the window stop.

Then use clear 100% silicon caulk all the way around on outside going thick on gaps like I see you have at the top.

Add a trim board behind the new window flush with inside of house to cover where rear old rollers were. I went with cedar. Can use anything.

Interior caulk as needed.

Also I didn't have that lip thing. I would eliminate it if all possible. Probably with same oscillating tool. And just trim all the way around starting at bottom, then top, then sides.

 

[Bacho]

It turned out it was pretty easy to remove the stop. It was a 1x4 that was only nailed to the window frame. I decided I would replace it all with PCV.

The sill nose was also water damaged. I couldnt find a dorect replacement in the store but think I have a plan now.

Trying to keep this project from escalating any further...