Should I install new construction windows with flanges over existing frames or build temporary frames for replacements to avoid returning windows?
Asked by Rakshitha Bal 
7 months ago
Last Updated: May 1, 2024
I’m looking for some advice on windows. Basically, I’m replacing all of mine and in a few spots I’ve changed the orientation and size. Those spots probably should have new construction windows with flanges, but here I am. Should I go ahead and 1) put flashing tape over them, build window frames slightly over it (like 1/4 inch), and then stucco up to that frame (pretending it’s a new construction window), or 2) remove the window, build a temporary frame to stucco up to, and then install the replacement windows over the stucco. I’m also open to other suggestions (except returning these windows for different ones because that was a hassle to get them in). I’d really appreciate some experienced advice on this!
Whatever your preference!
Are you planning on installing the windows in the same location as before, or are you moving them to a different spot? If you’re moving them, make sure the framing above and below (header, jacks, and cripples) is done correctly to support the weight of the roof.
Hey James, appreciate the response! I discovered a lot of termite damage inside, so I had to reconstruct the wall using new pressure-treated studs from the interior and reframed the window. ood call because there would have been a significant gap.
I think option two with a waterproof strip behind the windows and flashing/trim would work well.
Do you have enough time to do it properly?
Brook 😂 that’s a good point!
Yes, I do care about long-term results and minimizing future maintenance. I’ll be sure to take my time with it… but come on Brook, can I cut a corner just this once to finish one project? Haha
We all dream of being able to, but that little voice of reason inside our heads says no chance, buddy!
Whether you go for new or old construction windows isn’t crucial. Focus on proper insulation and sealing when making repairs to walls and framing. Choose whatever method you’re comfortable with. I’ll be doing a similar project soon, replacing siding and rearranging rooms with updates planned for the kitchen and bathroom. Make sure the windows align correctly with the new floor plan.
The setup resembles a trailer or storm window. Is that blue tape double-sided sticky window tape? If yes, remove it and place your sill squarely against it. Secure the sill to the existing one while pressing firmly against the tape. Remember to run caulk or silicone on the backside for better adhesion. Proceed to attach the side and top boards. Add a drip edge flashing on top and caulk the backs of the boards. Finish with stucco, final caulk, and you’re good to go.
Trim it down to ensure a solid seal, then cut and stucco it to match the trim. Apply a waterproof paint and then install gutters. Unless you’re dealing with horizontal rain, water shouldn’t be an issue for the windows.