Getting new windows in without the headaches: my step-by-step

diyer23 · 2026-04-03T03:46:22Z

Did my own window swap last spring (old 70s ranch, single pane nightmares). Here’s how I kept it mostly drama-free: 1. Measured the opening like five times—seriously, don’t trust the first measurement. 2. Dry fit the window before messing with caulk or shims. 3. Used flashing tape around the sill and sides, then set the window and checked for square (shims help here). 4. Screwed it in, but not too tight—learned that the hard way, cracked a frame once. 5. Finished with spray foam (low expansion) and sealed the outside with silicone. Anyone have a trick for getting the trim back on without gaps? I always seem to mess that part up.

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DIY Installing New Windows

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oreo_phillips

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I get what you’re saying about the temp, but honestly, I’ve never noticed humidity making much difference.

“my basement gets pretty damp and I swear the foam sets up faster down there.”

In my case, it’s always the can temp that changes things most. Maybe it’s just the brand I use, but even in a muggy crawlspace, it seemed to cure at the same rate as in my dry attic. Could be some foams are more sensitive than others?

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Getting new windows in without the headaches: my step-by-step

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Getting new windows in without the headaches: my step-by-step

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