Curious if anyone’s had problems with insurance or resale after doing a second layer instead of a full replacement.
I went the second-layer route on my old place (also in the PNW, just inland from you). No regrets for the first five years—saved a chunk of cash and it looked fine. But I started getting moss between the layers, and that was a pain. It’s true, you don’t really get more leak protection, just a new surface. If there’s anything wrong underneath, you’re basically hiding it... which can come back to bite you.
Resale wasn’t a huge issue for me, but the inspector definitely pointed out the double layer. Buyers tried to use it as leverage to knock down the price. Insurance didn’t care, but I’ve heard some companies do.
If your old shingles are curling or there’s any rot, I’d bite the bullet and tear off. If everything’s solid and you just want to keep costs down, adding a layer isn’t the end of the world—just be ready for more moss wars. Oregon coast weather loves to test your patience with that stuff.
I’ve been down this road, too—my place is just outside of Olympia, and the weather’s brutal on roofs. I agree with a lot of what you’re saying about the second layer being a mixed bag. It’s definitely cheaper upfront, but there are some technical trade-offs that don’t always get enough attention.
One thing I noticed after adding a second layer (asphalt over asphalt) was the extra weight. Most houses can handle it, but if your framing or decking is older or borderline, it’s worth checking the load specs. I crawled up in my attic to look for sagging after a heavy rainstorm—paranoid, maybe, but I’d rather be safe than sorry.
About moss: it’s relentless here. I had the same issue, and it seemed worse with two layers because moisture just lingered longer. Even with regular zinc strips and cleaning, the stuff found its way in between the shingles. That led to some minor rot on the edges, which I only found when I finally did a full tear-off years later.
On resale, my experience was similar—buyers’ inspectors flagged the double layer right away. It didn’t kill the deal, but it definitely gave them ammo to negotiate. Insurance was a toss-up; my carrier didn’t care, but a neighbor got denied coverage for wind damage because their policy specifically excluded multi-layer roofs. Seems like it depends on the company and how picky their adjusters are.
If your existing shingles are lying flat and there’s no sign of leaks or soft spots, a second layer can buy you time. But if you’ve got any curling or suspect decking, it’s probably not worth the risk. Full tear-off is a pain, but at least you know what you’re working with underneath—and you can upgrade the underlayment or add ice/water shield if needed.
One last thing: ventilation. Adding another layer can trap more heat and moisture, especially if your attic isn’t vented well. I had to add a couple more roof vents after noticing condensation issues post-install.
It’s a classic case of “pay now or pay later.” If you’re planning to stay put for a while, I’d lean toward tearing off and starting fresh. If you’re just trying to stretch things out for a few years, and everything’s solid, then layering isn’t the end of the world... just keep an eye on it and be ready for some extra maintenance.
Adding another layer can trap more heat and moisture, especially if your attic isn’t vented well. I had to add a couple more roof vents after noticing condensation issues post-install.
Yeah, the ventilation bit is huge and gets ignored way too often. I’ve seen folks slap on a second layer to save cash, then wonder why their attic smells like a wet gym sock. Also, tearing off sucks, but at least you don’t get that “mystery squish” underfoot when you finally walk the roof a few years later. If you’re gonna layer, at least check for soft spots first—your future self will thank you.
Honestly, I get why people want to just throw another layer on—cheaper, less mess, way faster. But in my case (asphalt shingles, midwest winters), the second layer just made things worse. Ended up with some weird leaks and ice damming I never had before. Tearing off is a pain, but at least you know what’s going on under there. Plus, warranties usually want a full tear-off anyway... learned that the hard way. If you’re gonna layer, double-check your local code too—some places won’t even allow it.
Yeah, I’ve seen the same thing happen—especially with older houses where you can’t really see what’s under that first layer. One thing I noticed during a recent job: when we tore off two layers, there was a ton of rotten decking underneath, totally hidden by the shingles. If we’d just added another layer, that wood would’ve kept getting worse. Plus, in colder spots, the extra weight and insulation from double shingles can actually make ice dams worse... kind of counterintuitive. It’s tempting to go for the quick fix, but sometimes it just leads to more headaches down the line.