You nailed it—ventilation is the unsung hero most folks overlook. I’ve seen way too many “miracle” coatings trap moisture and turn a minor issue into a full-blown headache. Midwest summers are brutal for that, especially with all the humidity. Even with all the right prep, sometimes you just can’t predict how a roof will react over time. At least you caught the condensation early. Every project’s a learning curve, for sure.
Yeah, I’ve seen that too—people think a fancy coating will fix everything, but if the attic’s not breathing, it just locks in all the moisture. I’m in Ohio and last summer we had a couple jobs where the customer wanted to “seal it up tight.” Looked great at first, but a month later, water stains started showing up inside. Turns out, the vents were half blocked by insulation and the coating just made it worse.
I used to think more layers meant more protection, but now I’m way more careful about what goes on top. Sometimes less is more, especially with older roofs that already have a few coats. It’s wild how much difference a couple extra vents or even just clearing out the old ones can make.
Humidity here is no joke either—sometimes you do everything right and still get weird issues. Just gotta keep learning, I guess.
- 100% agree on “less is more” sometimes. Seen too many roofs where extra coatings just trap moisture and cause rot or mold.
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— That’s the classic sign of poor ventilation. Coating can’t fix blocked vents.“Looked great at first, but a month later, water stains started showing up inside.”
- I’ve had folks swear by sealing everything tight, but in humid spots like Ohio, it’s just asking for trouble. Even a small vent issue gets amplified.
- You’re right about older roofs too. Layering on top of old materials can actually speed up failure.
- Clearing vents is underrated. Sometimes the simplest fix is the best one... weird how often that’s true.
I get the “less is more” thing, but I’ve actually had good luck with coatings—at least on my low-slope garage roof. Maybe it’s just the type of product or how dry the wood was underneath, but it stopped a ton of small leaks for me. That said, I do agree with
—tried that once and just made the attic musty. Guess it really depends on the roof and what you’re dealing with. Sometimes sealing makes sense, sometimes it’s just a band-aid.“Coating can’t fix blocked vents.”
I’ve had similar results—on my shed roof, a good elastomeric coating actually bought me a couple extra years. But yeah, like you said,
I learned that the hard way too. Sealing over ventilation issues just traps moisture and makes everything worse. For me, coatings only worked when the underlying structure was still solid and dry. If there’s rot or trapped water, it’s just masking the problem.“Coating can’t fix blocked vents.”