That’s interesting about the prep work—I’ve been reading up and it seems like a lot of these liquid flashings are really picky about surface conditions.
Makes me wonder if it’s worth the extra effort compared to just using peel-and-stick, especially for older homes where nothing is straight. Did you notice any spots where it didn’t want to stick, or was it just slow going? I’m still on the fence about trying it myself.“You really need to get the substrate clean and dry, and working around old, uneven framing took longer than I thought.”
I get where you’re coming from—liquid flashing does seem high-maintenance, especially when you mention,
But honestly, I found peel-and-stick can be just as fussy if your surfaces aren’t flat. On my last window swap, the tape kept bubbling up where the wood was warped, and it took a ton of extra rolling and patching. Liquid flashing was messier, but it actually filled gaps better for me. It’s more work upfront, but I felt like the end result was tighter, especially on my not-so-square 1920s frames.“working around old, uneven framing took longer than I thought.”
That uneven framing is a pain, isn’t it? I’ve run into the same thing—old houses rarely give you a flat, square surface to work with. You’re right about peel-and-stick being tricky on warped wood. I’ve had spots where no matter how much I rolled it, the tape just wouldn’t stay put. Sometimes I’ll use a primer or even staple down the worst spots first, but it’s still not perfect.
Liquid flashing is definitely messier, but like you said, it finds those weird gaps that tape just can’t cover. I usually brush it on heavy in the corners and let it self-level a bit before setting the window. It takes more time, but you end up with fewer air leaks and less worry about water finding its way in later.
It’s one of those things where there’s no real shortcut—just patience and a lot of rags for cleanup. On older frames, I always budget extra time because there’s almost always some surprise waiting under the trim. Sounds like you handled it the right way.
Totally agree about the “surprise under the trim” thing—my 1920s place had a mouse nest in one of the sills. The liquid flashing is messy, but honestly, I’d rather deal with that than peeling tape off in a month when it fails. I tried heat-gunning the tape once to get it to stick better—let’s just say that was a bad idea and leave it at that...
That’s wild about the mouse nest—I keep hearing about those kinds of surprises, and it makes me a little nervous to start pulling my own trim. The liquid flashing seems intimidating, but your point about tape failing over time is convincing. I hadn’t considered the risk of using heat on the tape... good to know that’s not the way to go. It’s encouraging to hear you’re willing to deal with the mess for a better seal in the long run. Makes me think patience really pays off with these old houses.