Notifications
Clear all

Foggy Windows: The Mystery Of The Ghostly Condensation

51 Posts
50 Users
0 Reactions
202 Views
rachel_barkley
Posts: 20
(@rachel_barkley)
Eminent Member
Joined:

“you think you’re in for a quick fix and suddenly you’re at the hardware store every weekend.”

That’s the truth—one soft spot in the sill and suddenly you’re knee-deep in wood hardener and replacement trim. Did you notice any mold or rot when you swapped the glass? Sometimes the condensation hides bigger issues, but I’m always torn between patching and just biting the bullet with full replacements. Curious if you checked the framing or just focused on the glass unit.


Reply
cathyc58
Posts: 24
(@cathyc58)
Eminent Member
Joined:

“I’m always torn between patching and just biting the bullet with full replacements.”

Honestly, I lean toward full replacement more often than not, especially if you’re already seeing soft spots or any hint of mold. Patching can work for a season, but in my experience, those problems creep back faster than you’d think. The framing’s where a lot of hidden rot hangs out—if you’re just swapping the glass, you might miss stuff under the surface. Sometimes it looks fine until you start poking around with a screwdriver... then it’s like opening Pandora’s box.


Reply
tea_steven
Posts: 33
(@tea_steven)
Eminent Member
Joined:

I had the same debate last fall when I found condensation between panes in my kitchen window. I tried a patch once—resealing the edges and hoping for the best—but the fog came back within months. Ended up replacing the whole unit. Turns out the sill had more rot than I expected, and just swapping glass would’ve missed that. It’s not cheap, but I’d rather deal with it once than keep patching every year.


Reply
Posts: 19
(@cloud_jackson)
Eminent Member
Joined:

That’s a familiar story. Once you see fog inside the panes, that seal’s pretty much shot and moisture’s going to keep sneaking in. Re-sealing can buy a little time, but unless you’re dealing with a really high-end unit where sash replacement is straightforward, it’s usually just kicking the can down the road.

I’ve pulled apart plenty of windows that looked like just a glass issue only to find hidden rot in the sill or frame—especially in kitchens or bathrooms where humidity’s higher. The thing is, if you don’t address the underlying wood damage, you’ll end up with draft issues and maybe even mold down the line.

Swapping out the whole window isn’t cheap, yeah, but sometimes it saves money (and headaches) over patching every year. If your house is older, there’s a good chance water’s been getting in for longer than you realize. I do wish manufacturers made it easier to just replace glass units without tearing apart trim and siding... but for most standard residential windows, full replacement ends up being more practical.

Curious if anyone’s had luck with those “defogging” services? I haven’t seen one last more than a year or two, but maybe I’m missing something...


Reply
Posts: 21
(@dieself73)
Eminent Member
Joined:

- You’re spot on about hidden rot—found the same thing in my 70s ranch after pulling a foggy unit.
- Tried “defogging” once... didn’t last through a full winter.
- Full replacement stings up front, but my heating bill dropped noticeably after biting the bullet.
- It’s a pain, but you’re not alone dealing with this mess.


Reply
jon_campbell
Posts: 16
(@jon_campbell)
Active Member
Joined:

That’s interesting about your heating bill—I’ve wondered how much of a difference new windows actually make, especially in older homes. Did you notice any drafts or comfort changes inside, or was it mostly just the utility savings? Curious if anyone’s tried storm windows instead of full replacement... I keep hearing mixed things.


Reply
fbrown42
Posts: 7
(@fbrown42)
Active Member
Joined:

Curious if anyone’s tried storm windows instead of full replacement... I keep hearing mixed things.

I put up interior storms on my 1920s place a couple winters back. Didn’t have the cash for full replacements and honestly, the old wood frames still looked good. The storms cut down on drafts way more than I expected—room felt less chilly, especially near the windows. Utility bill dropped a bit, but the biggest change was just not feeling that cold air creeping in. They’re not as pretty as new windows, but for the price, worth it. Only downside: they fog up sometimes when it’s really cold, but nothing too bad.


Reply
Posts: 2
(@runner138844)
New Member
Joined:

Yeah, I’ve had the same thing happen with my old place—"

they fog up sometimes when it’s really cold, but nothing too bad.
" It’s like a weird ghostly haze some mornings. Not ideal, but honestly I’d take that over freezing drafts any day. The storms definitely made the rooms feel less like an icebox.


Reply
finance978
Posts: 5
(@finance978)
Active Member
Joined:

I’ve noticed the same thing with my current apartment. The double-glazed windows fog up mainly on really cold mornings, especially if I forget to crack the bathroom window after a shower. I read somewhere it’s due to the temperature differential between the inside surface and the outside air, which makes sense, but it still looks odd—almost like someone’s lightly spray-painted the glass.

Honestly, I’d rather deal with condensation than those old single-pane windows I had before. The drafts were brutal, and no amount of weatherstripping seemed to help. Still, sometimes I wonder if the foggy effect means there’s a seal failure or if it’s just normal humidity buildup. Haven’t seen any actual water pooling, so maybe it’s nothing major, just annoying.

Kind of wish there was a way to get the insulation benefits without the weird morning haze... but I guess that’s just part of living somewhere with real winters.


Reply
nickartist
Posts: 17
(@nickartist)
Eminent Member
Joined:

That “spray-painted” look is exactly how mine get too—especially after a hot shower or on days when I forget to crack a window. The science checks out: it’s just warm, humid air hitting the cold glass, but it does look a bit ghostly.

Still, sometimes I wonder if the foggy effect means there’s a seal failure or if it’s just normal humidity buildup. Haven’t seen any actual water pooling, so maybe it’s nothing major, just annoying.

If the condensation is on the *inside* surface, it’s usually just your apartment’s humidity. Seal failures tend to cause fogging *between* the panes, which looks more like a permanent haze you can’t wipe away. Since you’re not seeing any moisture trapped inside the glass itself, I’d say your seals are probably fine.

I’m with you on preferring this over drafty single-pane windows. I had those in my last place and honestly, even with plastic film kits and foam tape, it felt like living in a wind tunnel. As for getting the insulation without the haze—have you tried running a bathroom fan or keeping a dehumidifier nearby? Not a perfect fix, but it cuts down the morning fog for me. Tradeoffs, I guess... sometimes it feels like you can’t win with old buildings and real winters.


Reply
Page 3 / 6
Share: