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

- Overlay’s cheaper up front, but you’re trapping any problems (rot, leaks, bad decking) under there.
- Michigan winters are rough - ice dams + heavy snow can find weak spots fast.
- Tear-off is more waste, but you get to fix what’s underneath and your new shingles last longer.
- I did an overlay once to save cash...regretted it when the old layer started curling and the whole thing looked wavy.
- If you’re staying long-term, full tear-off is worth it. Short term? Maybe overlay, but it’s a gamble.

That’s a solid breakdown. I went with a tear-off last year after finding some soft spots near the eaves - turned out there was way more rot than I thought. It cost more up front, but honestly, peace of mind is worth it, especially with Michigan winters. If you’re handy, you can save a bit by doing demo yourself, but it’s messy work. Either way, you’re thinking it through the right way.

- Tear-off always uncovers more than you expect. Seen it a hundred times after storms - hidden rot, bad decking, even old nails poking through insulation.
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“It cost more up front, but honestly, peace of mind is worth it, especially with Michigan winters.”

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

That’s a good point about ice dams. I’ve read that two layers can make it harder for heat to escape, so the snow melts unevenly and refreezes at the eaves. I’m leaning toward a tear-off for that reason, but the price difference is no joke - got quotes that were $2k+ higher for full removal. Still, if there’s hidden rot, I’d rather know now than pay for repairs later. Insurance didn’t cover anything here since it was just age, not storm damage.

Still, if there’s hidden rot, I’d rather know now than pay for repairs later.

That was my thinking too when we did ours last year. We bit the bullet and went for a full tear-off. Yeah, it cost more upfront, but we found a couple of soft spots in the decking that would’ve gotten worse. If you’re in a colder climate, that extra layer can definitely make ice dams worse - happened to us before. One thing I didn’t expect: the mess. Full removal is noisy and dusty, but at least you know what you’re working with underneath. If you plan to stay in the house long-term, I’d say it’s worth it.

Full tear-off here too, and honestly, I was glad we did it. Found some old water damage that would've just kept spreading. The noise was rough for a couple days but at least now I don't worry every time it rains. Adding a layer might be cheaper, but I just didn't want to risk trapping problems underneath.

I get where you’re coming from. Full tear-off can be a pain in the short term, but it’s the only way to really know what’s going on under there. I’ve seen too many jobs where a second layer just hid rot or mold, and then it cost way more down the line. Sure, adding a layer saves money up front, but if your decking’s got issues, you’re just covering them up. Plus, some warranties won’t even cover double-layer installs. I’d rather deal with a few days of noise than gamble with hidden damage.

I hear you about the hidden damage risk. Still, I’ve got to admit, the upfront cost of a full tear-off made me hesitate. I live in a 1960s ranch with a low slope, and my roofer said the decking looked solid from what he could see. Ended up going with an overlay to save some cash... but now I’m crossing my fingers every time it rains. If I had more wiggle room in the budget, I probably would’ve bitten the bullet for peace of mind. It’s a tough call when money’s tight.

Ended up going with an overlay to save some cash... but now I’m crossing my fingers every time it rains.

Yeah, I get that tension. Did your roofer mention how an extra layer might affect things like ventilation or potential warranty issues down the line? I keep hearing mixed stuff about overlays and attic moisture, especially on older homes.

I’ve been down this road - my last house had two layers, and I swear the attic felt stuffier after the overlay. I always wondered if that extra weight and insulation trapped more heat and moisture up there. Did you notice any changes in your attic, like musty smells or dampness? Sometimes it’s subtle at first, especially if your vents aren’t great to begin with. Curious if your roofer checked the ventilation situation before adding the new layer...

Full tear-off seemed like overkill to me at first, but after living with a double-layer roof for a few years, I’m not so sure anymore. I went the “budget” route, had a second layer put on top of the old shingles (asphalt), and figured I was being smart saving on labor and disposal costs. Didn’t really think about what that meant for the attic until the first humid summer rolled around.

I started noticing this weird, stale smell upstairs - kind of like wet cardboard. At first I blamed it on an old box of Christmas stuff, but nope... it was definitely coming from the attic. I crawled up there and it just felt heavy, if that makes sense? Like the air wasn’t moving. My vents were original to the house (built in the 80s), so probably not great to begin with. The roofer said “it’ll be fine,” but in hindsight, he didn’t even look at the venting situation before slapping that second layer on.

I get why people do overlays - money’s tight and roofs aren’t cheap - but you’re right about heat and moisture getting trapped. I live in a humid area (Midwest), so maybe it’s worse here than out west or somewhere dry. Either way, after a couple years, my plywood started showing dark spots. Not full-blown mold, but enough to make me nervous.

If I could do it again, I’d push harder for better ventilation or maybe just bite the bullet and do a full tear-off. The upfront cost stings, but having to deal with potential rot or even replacing decking down the line is way worse for your wallet. Maybe overlays work better if you’ve got perfect airflow or live somewhere dry... but for me? Not worth the gamble.

Just my two cents from living through it - sometimes “saving” money ends up costing more in headaches later on.

That’s interesting - did you ever try adding more vents or upgrading the existing ones after you noticed the smell? I’ve wondered if retrofitting better ventilation could offset some of the issues with double layers, or if it’s just a losing battle once there’s that much material trapping heat and moisture.

I’ve actually run into this a few times - folks hoping more vents would fix the musty smell after a second layer went on. Sometimes it helps a bit, but honestly, once you’ve got two layers trapping heat and moisture, it’s tough to get real airflow. I remember one job where we added ridge and soffit vents, but the attic still felt damp in summer. If the old shingles are curling or there’s any rot underneath, ventilation alone usually can’t keep up. Full tear-off is more work upfront, but you get a clean slate and way fewer headaches down the road.

Had a similar situation at my uncle’s place last year - he wanted to just slap another layer on top to save some cash. We did it, but man, the attic started smelling funky after a few months, especially when it rained. Ended up having to rip everything off anyway because there was some hidden rot under the old shingles. Honestly, I get why people want the quick fix, but sometimes it just makes more work later.

That’s the part that worries me - what if you cover up a problem and it just gets worse? I keep hearing that adding a second layer saves money upfront, but does it really if you end up redoing the whole thing anyway? My neighbor did the “quick fix” route and now he’s got sagging spots and some weird stains on his ceiling. Is there ever a situation where a second layer actually works out long-term, or is it always just kicking the can down the road?

My neighbor did the “quick fix” route and now he’s got sagging spots and some weird stains on his ceiling.

That’s a fair concern. I get what you mean about “kicking the can down the road” - I’ve seen that happen a lot, especially around here where we get wild weather swings. Sometimes folks think they’re saving money, but then you hear stories like your neighbor’s with sagging and stains. Not a great trade-off.

Thing is, I have heard of second layers working out okay if the original roof’s still in decent shape - like, no rot or major leaks, just worn shingles. But honestly, it seems pretty rare that everything underneath is perfect, unless the roof’s not super old. I’m always a little skeptical when contractors push for a second layer without checking for hidden issues.

Curious - did your neighbor’s roof have any visible problems before they added that new layer, or did stuff only show up after? Sometimes it’s hard to tell what’s brewing under there until it’s too late…

That’s what gets me - sometimes you can’t spot the trouble until you’re already in it. I’ve seen a few roofs where everything looked fine from the ground, but once you start poking around, surprise! Rotten decking or soggy insulation hiding under those old shingles. It’s like a bad game of “roofing roulette.”

I get why folks want to skip the tear-off (less mess, less cash up front), but man, if there’s even a hint of soft spots or leaks, it feels risky to just slap another layer on. Especially with all the freeze-thaw cycles we get here - water finds every little gap.

One of my uncles tried the double-layer thing a while back. Looked okay for a couple years, then he got these weird brown stains in his living room ceiling. Turns out, there was an old leak nobody caught because they never pulled the shingles off. Ended up costing him more than if he’d just done a full replacement.

Guess it comes down to how much you trust what’s under there… and how lucky you feel!

Guess it comes down to how much you trust what’s under there… and how lucky you feel!

That’s the truth. I went the “just add a layer” route on my old place, thinking I’d save a buck, and it bit me hard. Looked fine for a while, but the first big spring melt, water started dripping right through a light fixture. Never again. If you’re already seeing soft spots or leaks, skipping the tear-off is just asking for trouble, especially with our crazy winters. Sometimes paying more up front is just less headache in the long run.

Sometimes paying more up front is just less headache in the long run.

That makes sense, but what if the decking looks solid and there’s no sign of leaks? Is there ever a situation where adding a layer actually works out, or is it always a gamble? I’ve heard some folks say it can help with insulation, but not sure if that’s true or just wishful thinking...