I’m starting to think my bathroom vent just dumps into the attic instead of outside, which probably isn’t helping.
That’s a big one—if your bath fan isn’t vented outside, it’ll definitely keep things muggy upstairs. I had to reroute mine last year and it made a noticeable difference. Also, double-check that your attic hatch is sealed tight. Even with good insulation, air leaks can let humid air sneak up from below. Noticed that after I added weatherstripping, the humidity dropped a bit.
- I had the same issue with my bathroom vent—turns out it was just blowing straight into the attic too. Once we fixed it, the upstairs felt way less stuffy.
- Weatherstripping the attic hatch helped a bit, but honestly, I still get some humidity up there in summer. Not sure if it’s just normal or if I’m missing something.
- Curious if anyone’s had to deal with mold or wood rot from this? I keep hearing horror stories but haven’t seen anything (yet)...
Trying to budget out a CertainTeed roof—any tips?
I’m still trying to wrap my head around how much attic humidity is “normal” too. I’ve read so many conflicting things—some say it’s just a summer thing, others act like any moisture up there is a disaster waiting to happen. Honestly, I haven’t seen actual mold (yet), but I do get that musty smell sometimes when it’s humid out. Makes me wonder if there’s something sneaky going on behind the insulation or if I’m just being paranoid.
As for the venting, I thought mine was fine until last month when I poked my head up there and realized one of the ducts had come loose. Not sure how long it’d been dumping air into the attic... probably longer than I want to know. Fixed it and things seem better, but now I’m questioning if my bathroom fan is even strong enough for the space.
Is it possible that some houses just have more attic humidity because of location or build? Or am I missing some obvious fix? Would hate to fork over cash for a new roof and then have hidden rot pop up later...
That musty smell is always a red flag for me, even if you don’t see mold yet. In my experience, some houses just trap more humidity—older insulation, weird roof angles, or even just how the wind hits your place can make a difference. I’ve seen bathroom fans that barely move air, especially if the duct run is long or kinked. Have you checked if yours actually vents outside and not just into the attic? That’s a classic “oops” I’ve run into more than once. If you’re budgeting for a new roof, I’d definitely factor in a look at the venting setup—cheaper to fix now than after you’ve got new shingles down.
You’re spot on about venting—so many people skip that step and regret it later. I’d even say, if you’re already investing in a CertainTeed roof, why not go the extra mile with upgraded attic vents or even a solar fan? It’s wild how much difference it makes for moisture and energy bills. I had to redo my own after mold popped up in the corners... wish I’d caught it before shingling.