Weighing the pros and cons: full roof removal vs. just adding a new layer

sometimes a second layer isn’t all bad - especially if the first one’s still in decent shape and there’s no sign of leaks or soft spots

That lines up with what I’ve seen too. We looked into a tear-off last year, but the inspector said our decking was solid and the original shingles weren’t curling or anything. Ended up saving a few grand just going over top. I get why folks worry about weight, but around here (central IL), it’s pretty common and hasn’t caused issues for us or the neighbors. Not perfect, but sometimes you just have to weigh the risk against your wallet...

We did the same thing a few years back - just put a second layer on instead of tearing everything off. Our house is older, but the decking was still solid and no leaks, so it made sense for us. I know some folks say it’s not ideal long-term, but honestly, the cost difference was huge and we haven’t had any problems yet. Maybe if we lived somewhere with heavier snow loads I’d worry more, but here in southern Indiana it’s worked out fine.

Our house is older, but the decking was still solid and no leaks, so it made sense for us.

We did something similar on our last place - added a second layer of shingles instead of a full tear-off. The savings were pretty significant, and like you, our decking was in good shape. I always wondered if it’d make the roof hotter in summer or shorten shingle life, but honestly, we didn’t notice much difference. Did you see any change in your attic temps or energy bills after the second layer? I’ve heard mixed things about that part.

I’ve seen a lot of folks go the second-layer route, and honestly, it’s kind of a mixed bag. Sometimes you get lucky and there’s no real change in attic temps, but I’ve also inspected homes where the extra layer seemed to trap more heat - especially on low-slope roofs or with poor ventilation. Did you check your attic vents after the new shingles went on? Sometimes contractors accidentally block them or just don’t pay attention. That can make a bigger difference than the shingles themselves, at least from what I’ve seen poking around up there.

- I get the ventilation thing, but isn’t it also about how much weight your roof can handle?
- My place is older, and I was told a second layer could stress the structure over time.
- Full tear-off cost more upfront, but I figured it’d help spot any hidden rot or leaks.
- Not sure if attic temps changed much, but peace of mind was worth it for me... anyone else worry about long-term issues with double layers?