I swear, every time it pours, I get that sinking feeling—like, is this the day my living room turns into a mini swimming pool again? Last fall, I noticed these annoying little puddles forming on the windowsill, and at first I thought maybe I’d left a window cracked. Nope. Turns out, the caulk around the outside frame had basically turned to dust (my house is from the ‘70s, so I guess nothing lasts forever). I tried one of those “all-weather” silicone sealants from the hardware store. It said it was good for rain, sun, snow, you name it. The application was pretty straightforward, but honestly, it’s not as neat as the YouTube videos make it look. My lines are kinda wobbly.
Here’s the thing: it worked for a while, but after a couple months of weird freeze-thaw cycles, I started seeing damp spots again. I’m wondering if it’s just the age of the windows or if I should’ve gone with a different product, like that fancy tape stuff people talk about. Or maybe I missed some hidden crack? I did notice the wood under the sill feels a bit soft in one spot, which is probably not a great sign.
Anyone else have better luck with certain sealants or methods? Or is this just what happens with old windows and you’re stuck redoing it every year? Would love to hear if someone’s found a longer-term fix—especially if you live somewhere with wild weather swings like I do.
Yeah, I’ve had the same struggle with my 60s windows. Those “all-weather” caulks sound good on paper, but the freeze-thaw cycles just eat them up, especially if there’s any movement in the frame. I tried that flashing tape once (the butyl kind) and it actually held up better, but it’s a pain to install neatly if you’re not pulling the trim off. That soft wood under your sill is a red flag though—moisture might be getting in from somewhere less obvious, like behind the siding or even the top of the window. Sometimes it’s not just the sealant, it’s the whole setup getting tired. I’m starting to think with old windows, it’s just a yearly battle unless you bite the bullet and replace them... which isn’t cheap.
That soft wood under the sill is exactly what got me last spring—thought I’d sealed everything up tight, but water found its way in behind the siding where the flashing was just... gone. Years ago, I’d have just slapped on more caulk and called it good, but after seeing how freeze-thaw cycles chew through even the best stuff, I started using a combo of flexible flashing and a high-quality polyurethane sealant. It’s more hassle upfront, but honestly, it saved me from having to replace a whole section of framing. Still, with these old windows, sometimes you’re just buying time.
Yeah, I hear you on the old windows—sometimes it feels like you’re just delaying the inevitable. I tried the caulk-over-old-caulk routine a couple times, but it never held up past a winter or two. Flexible flashing is definitely better, but I’ve still had water sneak in during those sideways rainstorms. Honestly, unless you pull the trim and really get in there, it’s tough to know what’s going on behind the scenes. At some point, I just started budgeting for eventual window replacement... patch jobs only go so far with 60-year-old frames.