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Need advice on replacing an old leaky roof

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Posts: 14
(@woodworker75)
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if the leak’s been slow and only hit a small area, is it ever okay to just dry it out and patch, or is that just asking for trouble down the road?

I’ve wondered the same thing. Honestly, I tried drying and patching a small spot once—looked fine for a year, then the musty smell crept back. Not sure I’d risk it again, even if it feels wasteful to rip out more than you have to. Mold’s just sneaky like that.


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Posts: 7
(@diy171)
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I get the temptation to just patch and hope for the best, especially when it’s a pain to tear up a ceiling or wall. Last winter, I thought I’d gotten away with just drying out a corner in our mudroom after a minor drip—fast forward to spring and the paint started bubbling. Turns out, water had spread further than I realized. Honestly, if I could go back, I’d open it up more the first time. It’s a hassle, but chasing hidden moisture is worse. Mold’s way too stubborn for shortcuts, at least in my experience.


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(@michaelgamerdev)
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- Been there—patch jobs always seem easier, but they bite you later.
-

“Mold’s way too stubborn for shortcuts, at least in my experience.”
Couldn’t agree more.
- Had a project where we tried to save some drywall after a leak. Ended up gutting twice as much later because the moisture just kept spreading.
- If you’re already seeing bubbling or stains, it’s usually worth opening up more than you think.
- It’s a pain now, but way less hassle (and cost) than dealing with hidden mold or rot down the line.


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Posts: 7
(@phawk76)
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“If you’re already seeing bubbling or stains, it’s usually worth opening up more than you think.”

That’s been my experience too. Had a client who wanted to just patch over some old water spots in the ceiling—turned out there was rot in the rafters we wouldn’t have caught if we hadn’t opened things up. Curious—has anyone tried those moisture meters for checking how far the damage goes? I’ve had mixed results, but maybe I’m missing a trick.


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Posts: 9
(@yoga_becky)
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Title: Need Advice On Replacing An Old Leaky Roof

I’ve run into the same thing with water stains—what looks minor from the outside can be hiding a lot more trouble underneath. It’s frustrating how deceptive those spots can be. I’d agree that opening up more than you think is generally the safer bet, even if it feels like overkill at the time. Catching rot early is so much cheaper than dealing with structural repairs down the line.

About moisture meters, I’ve used both pin-type and pinless models over the years. They’re handy for getting a general idea, but I wouldn’t trust them as the final word. The pinless ones especially seem to pick up surface moisture more than anything deeper, which can give a false sense of security if there’s hidden dampness inside the wood. The pin-type meters are a bit better, but you have to be willing to poke holes in things—which isn’t always ideal if you’re trying to keep things tidy.

One trick I’ve found is to use the meter in a grid pattern and look for sudden jumps in readings rather than focusing on the absolute numbers. If you see a big spike in one spot, it’s usually worth opening up right there, even if everything around it seems dry. But honestly, nothing beats actually pulling down a section and seeing what’s going on.

Sometimes I wonder if we lean too much on gadgets and not enough on old-fashioned detective work—using your eyes and nose, tapping with a screwdriver, that kind of thing. I’ve had plenty of cases where something “tested dry” but smelled musty or felt spongy underfoot, and sure enough, there was trouble lurking.

Anyway, sounds like you’re taking the right approach being cautious. Better to be thorough now than regret it later. Roof leaks are sneaky—once water gets in, it finds all sorts of creative ways to make a mess you can’t see from below.


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