The extra weight isn’t always a big deal structurally, but it can void warranties and make future repairs a pain.
That’s the part that always gets me—sure, my wallet loves the idea of just slapping another layer on and calling it a day, but then I picture myself ten years from now, cursing at some mystery leak and realizing I’ve got double the shingles to peel off. Been there, done that (regretfully).
I’ll admit, I tried to convince myself that “just one more layer” wouldn’t hurt when I re-roofed my old place. The contractor looked at me like I’d asked him to use duct tape instead of nails. In hindsight, he was right—there was a patch of rot near the chimney that would’ve gone totally unnoticed if we hadn’t done the tear-off.
It’s not easy to swallow the upfront cost, but you’re spot on about warranties and future headaches. And yeah, ventilation is a sneaky one... I found out my attic fan was basically just spinning for fun because the old vents were blocked with insulation. Sometimes you don’t know what’s lurking up there until you really dig in.
Hang in there—it’s a pain now, but your future self (and your roof) will thank you.
I get the argument for tearing everything off, but is it always necessary? On some of my properties, we’ve done a second layer when the decking was still solid and there weren’t any leaks or soft spots. Saved a ton on labor and disposal fees. Sure, you lose out on some warranties, but if you’re not planning to hold onto the place forever, does that really matter? I guess it depends how long you plan to stick around and how much risk you’re willing to take. Sometimes “good enough” really is good enough...
Saved a ton on labor and disposal fees. Sure, you lose out on some warranties, but if you’re not planning to hold onto the place forever, does that really matter?
I’m with you—sometimes it just makes sense to go over the old shingles, especially if the roof’s still solid underneath. I did a second layer on my garage a few years back and honestly, it’s held up fine. The only thing I wonder about is weight—some older houses might not love the extra load, especially with heavy snow. Anyone ever run into issues with sagging or anything like that? For me, it’s always a balance between cost, hassle, and how long I plan to stick around.
- Agreed, layering can be a good call if the structure’s up for it.
- Biggest risks I’ve seen:
• Extra weight, especially on rafters that are already iffy or in places with heavy snow loads.
• If there’s any hidden rot or soft spots, they can get worse since you’re not seeing the decking.
- I’ve inspected homes where double layers led to minor sagging over time—usually older framing, low slope roofs.
- You’re right about warranties too… most shingle makers won’t back two layers. Not a huge deal if you’re selling soon, but worth knowing.
- For storm damage, insurance adjusters sometimes give less for repairs on double-layer roofs since tear-off is trickier. Just something to keep in mind.
I get the temptation to just layer, especially when you’re staring at a roof that’s not leaking yet but looks tired. I did it once on my old ranch—regretted it after a couple winters.
That’s what got me. Snow piled up, and suddenly I had a subtle dip in the living room ceiling. Ended up costing more to fix than if I’d just ripped the old shingles off in the first place. If your framing’s even a little questionable, I’d say tear-off is the safer bet.“Extra weight, especially on rafters that are already iffy or in places with heavy snow loads.”
