I’ve had a similar experience—caught a small leak in my attic last spring, and after pulling out the wet batt insulation and running a box fan for a couple days, it dried out pretty well. No musty smell or anything since. I do think it depends a lot on how fast you catch it and what kind of insulation you’re dealing with. Polyiso, like you said, is a pain. But fiberglass or mineral wool? Sometimes you get lucky if you act quick.
Catching it early really does make all the difference. Once water gets into batt insulation, it’s a race against the clock before you start seeing mold or that nasty smell. Pulling it out and running a fan like you did is exactly what I’d do—sometimes you get lucky if there’s good airflow and it wasn’t soaked for too long. I’ve seen cases where folks waited just a bit too long and had to replace whole sections, so being quick is key.
Polyiso’s definitely trickier. That stuff doesn’t dry out nearly as well, and once it gets saturated, it can start to break down or hold moisture in weird pockets. Fiberglass and mineral wool are a bit more forgiving, but even then, I always check the wood underneath for any soft spots or staining before putting new insulation back in.
Honestly, your approach sounds spot-on. Not every leak turns into a nightmare if you’re on top of it and don’t mind getting your hands dirty. Sometimes you just have to trust your nose—if there’s no musty smell after drying things out, you probably dodged the worst of it.
I’m with you on not waiting around when there’s water involved.
That’s the trick—move fast, or you’re just asking for headaches later.“Pulling it out and running a fan like you did is exactly what I’d do—sometimes you get lucky if there’s good airflow and it wasn’t soaked for too long.”
As for how often to check the roof, I honestly think most people don’t do it enough. Twice a year minimum, especially after a rough winter or big storm. I’ve got a flat roof on my shop, and even though it’s only five years old, I still get up there every spring and fall. Found a popped seam last year before it turned into anything major—saved me a ton of hassle.
Polyiso is a pain, no argument there. Once that stuff gets soggy, forget about it. I’d rather deal with fiberglass any day. And yeah, always check the wood underneath... learned that lesson the hard way when I thought everything was fine but ended up with soft decking.
Bottom line: don’t trust that “out of sight, out of mind” thing with roofs. It’ll bite you eventually if you do.
You nailed it—waiting for water to “dry itself out” is just asking for trouble. I’ve seen more hidden rot from folks ignoring a little drip than I care to admit. Twice a year checks are solid advice, though I’ll admit, sometimes I wish roofs came with a warning light like cars do... Polyiso really is unforgiving once it’s wet. At least fiberglass gives you a fighting chance. Good on you for catching that seam early—most people don’t notice until their ceiling looks like a topographical map.
Polyiso really is unforgiving once it’s wet. At least fiberglass gives you a fighting chance.
I’ve actually had the opposite experience—fiberglass can hide moisture for ages, and by the time you spot the problem, you’re dealing with mold in the insulation and the decking. Polyiso’s quick to show damage, which is a pain, but at least you know right away something’s wrong. I guess it depends on the roof setup and climate, but I’d rather deal with a material that “tattles” early than one that keeps secrets.
