If you’re not 100% sure it’s bone dry, you’re just sealing in problems.
That hits the nail on the head. I’ve lost count of how many times I’ve seen bubbling or peeling on a “freshly coated” roof just because someone rushed the prep. Folks see those slick ads and think a miracle coating will fix rot or leaks, but it’s really just putting a lid on top of whatever’s underneath—good or bad.
I do agree about breathable membranes being a smarter move, especially on older homes where moisture is already an issue. It’s tempting to go for the quick fix, but in my experience, those coatings can actually trap water and speed up wood rot or mold. One job I checked out last year, they’d coated over some damp decking and by spring, the whole thing was soft underfoot… ended up costing way more than if they’d just replaced the trouble spots first.
Not saying coatings are always bad—they have their place—but skipping steps or ignoring what’s under the surface is asking for trouble. Sometimes spending a bit more upfront saves you from bigger headaches down the line.
Not saying coatings are always bad—they have their place—but skipping steps or ignoring what’s under the surface is asking for trouble.
Couldn’t agree more. I’ve seen folks slap on a “miracle” coating thinking it’ll solve everything, but if there’s moisture hiding underneath, you’re just making a petri dish for rot. Had a neighbor who tried to save money by coating over some old cedar shakes—looked great for a few months, then the whole thing started sagging and stinking like wet mulch. Ended up ripping it all off and going with a green roof system instead.
Breathable membranes make a world of difference, especially in damp climates. They let moisture escape instead of trapping it, which is huge if you’re dealing with older wood or questionable decking. I get why people want quick fixes, but honestly, nothing beats taking the time to check what’s really going on under there. Sometimes you gotta bite the bullet and do some demo before you build back up. It’s not as flashy as a new coating, but in the long run, it’s way less hassle.
That’s a good point about the quick fixes. I looked into coatings when I bought my place last year, mostly because the idea of just rolling something on and being done sounded pretty appealing. But after poking around in the attic and seeing some old water stains, I figured it was smarter to get a roofer to check for hidden damage first. Turns out there was some soft decking under one corner—nothing major, but enough that a coating would’ve just trapped the problem.
I ended up going with a breathable underlayment and new shingles instead of a coating. Cost more up front, but I sleep better not worrying about mold or rot sneaking up on me. I get why people want to save money, but sometimes those shortcuts just make things worse (and more expensive) in the long run.
Funny thing is, my neighbor did the opposite—put a fancy white coating on his flat roof and now he’s dealing with leaks around the skylight. Guess there’s no substitute for actually checking what’s under the surface before you cover it up...
Couldn’t agree more about checking under the surface first. I’ve seen folks slap on a coating thinking it’ll solve everything, but if there’s even a little rot or moisture trapped underneath, you’re just asking for trouble. Like you said,
I did a patch job on my old shed roof with a sealant once—looked fine for a year, then the whole corner started sagging from hidden rot. Lesson learned: quick fixes can come back to bite you.“sometimes those shortcuts just make things worse (and more expensive) in the long run.”
Seen this a lot, especially on older homes around here. Folks think a fresh coat will fix leaks, but if the decking’s soft or there’s hidden moisture, you’re just sealing in the problem. Had a job last fall—customer wanted a quick coating over some “minor” leaks. Pulled up the old material and half the plywood was mush. Ended up costing way more than if they’d dealt with it early. Sometimes you just can’t shortcut the prep work, no matter how tempting it is.