How do you seal your windows—tape, liquid, or old-school metal flashing?

I’ve tried that stretchy flashing tape (the black stuff), but my neighbor swears by the classic aluminum flashing and caulk.

I hear you on the tape—it’s quick and not too tricky, but I’ve noticed it can peel back after a couple of tough New England winters. The aluminum flashing with caulk is definitely more old-school, but I actually like that combo for spots that get a lot of water. It just feels sturdier, even if it’s a bit more fiddly to install. The brush-on waterproofing stuff…yeah, it works, but it’s messy as heck and I always worry I’ll miss a spot or get it everywhere except where I want.

I did regret not hiring it out once, but only because I underestimated how much time it would take to do all the windows on my 1920s house. If you’re just doing one or two, DIY isn’t bad, but if you’ve got a whole bunch, it’s a slog. Anyone else notice the tape doesn’t stick as well when it’s cold out? That’s bitten me a couple times.

That’s interesting about the tape not sticking in the cold—I’ve had the same issue, especially below 40°F. The adhesive just doesn’t bond well unless it’s warm, which is frustrating in New England. I get why people still use aluminum flashing and caulk. It seems like more work up front, but I wonder if that durability pays off over a decade or so. The brush-on waterproofing always feels risky to me, too…one missed spot and you’re back to square one.

Totally relate to the tape struggles in cold weather. When I tried it last December—mid-20s outside—the stuff just peeled off after a day or two, even after warming it up with a hair dryer. Ended up going back to metal flashing and caulk for the basement windows. It’s definitely more work, and getting those corners right took me forever, but I figure if I only have to do it once every ten years, maybe it’s worth the hassle. The liquid waterproofing seems tempting, but I’m paranoid about missing a spot...one pinhole leak and you’re dealing with rot again.

Yeah, those tapes are so hit or miss depending on the weather. I had the same issue last winter—thought I’d save myself some time with the fancy tape, but it just wouldn’t stick to the old wood frames, even after cleaning and warming everything up. I ended up peeling it off and going with a tube of caulk and some thin aluminum flashing from the hardware store. Not exactly pretty, but it’s held up through two storms so far.

I get what you mean about the liquid sealers too. I tried one of those brush-on waterproofing products around a basement window and honestly, I was second-guessing whether I got every spot. The stuff is messy, and if you miss a bit or it doesn’t cure right, water finds its way in anyway. Plus, once it’s on there, it’s not coming off easily if you ever want to redo things.

Honestly, for me, it’s a tradeoff between how much time I want to spend and how much peace of mind I want. Metal flashing and caulk take longer upfront—measuring, cutting, fiddling with corners—but like you said, if it lasts a decade or more, maybe that effort pays off. My only regret is not doing it before the cold set in; working outside in November isn’t my idea of fun.

I haven’t bothered hiring anyone yet because half the time they just use the same materials anyway. Plus, at least when I do it myself, I know where every seam is and can keep an eye on trouble spots year to year. That said, my finish work isn’t winning any beauty contests... but as long as it keeps the drafts out and prevents rot, I’m calling it a win.

My only regret is not doing it before the cold set in; working outside in November isn’t my idea of fun.

Honestly, I think the timing matters more than the method sometimes. I get the appeal of caulk and flashing for durability, but I’ve had decent luck with the newer high-bond tapes—if you catch a warm, dry day and really press them in, they can hold surprisingly well. Not saying they’re perfect, but for old windows where you don’t want to make things permanent, it’s less hassle. I guess it depends how much you care about looks vs. longevity.

I hear you on the timing—did my first round of window sealing in late October a couple years back, thinking I’d beat the frost. Nope. Ended up wrestling with sticky tape and half-frozen fingers anyway.

On the high-bond tapes… I’ve used both the 3M stuff and some off-brand, and honestly, they surprised me. One old basement window had a draft I could practically feel across the room, and after cleaning everything up, that tape stuck like a champ through two winters. That said, I did notice some curling at the edges once spring rolled around. Maybe it was too much moisture or I didn’t press hard enough, but it’s something to watch for.

For looks, though, I still lean toward caulk or even paintable sealant for anything facing the street. Tape’s great for quick fixes or hidden spots, but if you’re fussy about curb appeal, it can look a bit patchy after a season. Guess it really depends on how much you want to fuss with it later…

Funny, I’ve had almost the exact opposite luck with tape on basement windows—sometimes it holds up great, sometimes it’s peeling by March no matter how careful I am. I’m with you on curb appeal though; tape just never looks right from the street. For my own place, I usually go with a high-quality exterior caulk for anything visible. It takes more prep and cleanup, but the finish is way cleaner and it’s less hassle come spring. Still, there’s something to be said for metal flashing on older homes... especially if you’re dealing with shifting frames or bigger gaps. Not the prettiest job, but it’s bulletproof once it’s in.

- I’ve run into that tape problem too—sometimes it just doesn’t want to stick through a full winter, especially on those old painted frames.
- For jobs where looks matter (front windows, porch), I always go for exterior caulk. It’s a bit more work, but the cleanup is easy and it holds up well.
- Had a client with a 1920s house—nothing but metal flashing would close up those warped frames. Not pretty, but it’s rock solid and you never have to mess with it mid-season.
- Tape’s fine for quick fixes, but if you want to “set it and forget it,” caulk or flashing is where it’s at.

I’ve been wrestling with this exact dilemma since moving into my place last fall. The windows are original to the house (1948), and let’s just say “drafty” is putting it mildly. I tried the clear plastic window insulation kits with tape, thinking I’d get a quick win. Honestly? Looked great for about a week, then the tape started peeling off on the bottom corners—probably because the paint is a million years old and not exactly smooth.

Tape’s fine for quick fixes, but if you want to “set it and forget it,” caulk or flashing is where it’s at.

This rings true. I’m tempted by caulk, especially for the back bedrooms where appearance isn’t a big deal. But I keep second-guessing myself—if I caulk everything shut, does that mean I basically lose the option to open the windows until spring? Or is there some magical “removable” caulk I haven’t discovered yet? I saw something called “temporary weatherstripping” at the hardware store, but it felt like glorified putty.

Metal flashing kind of intimidates me. My neighbor swears by it (his house is even older than mine), but I can’t picture myself cutting and fitting metal around every odd-sized window frame. Plus, isn’t that overkill unless your frames are really warped? Maybe that’s just me being lazy.

Aesthetically, tape and plastic are ugly, but at least they’re reversible. Caulk seems like a good middle ground if you’re not worried about opening things up midwinter. Still, part of me wonders if it’s worth just biting the bullet and getting storm windows... but that’s a whole other budget rabbit hole.

Curious if anyone’s had luck with those removable caulks or any less-permanent options that actually stick through a full New England winter. The struggle continues...