what if you peel it back and find a whole mess of rotten wood? My wallet cries just thinking about it.
- Had this happen last summer. Pulled up two layers of old shingles, found a section over the porch where the decking was basically mulch.
- Ended up replacing about 6 sheets of plywood. Not cheap, but honestly, better than letting it keep rotting and risking bigger issues (mold, sagging, etc).
- If you just add a new layer, you’re kind of rolling the dice. Might save money now, but if there’s hidden damage, it’ll bite you later—usually when you least want it.
- My neighbor went the overlay route to save cash. Three years later, he had leaks and had to do a full tear-off anyway—plus more wood to replace by then.
- If you’re worried about cost, maybe get a roofer to do some test cuts in suspect spots before committing? At least then you’ll know what you’re in for.
Not saying tear-off is fun on the wallet, but sometimes it’s the lesser evil. At least you know what’s up there...
I get the logic behind a full tear-off, but I’ve seen overlays work out fine in certain cases—especially if the existing shingles are still flat and there’s no sign of leaks or soft spots. Not every roof hides major rot. Sometimes, especially on newer homes or with good attic ventilation, you can get another decade without issues. It really depends on the age and condition of what’s already up there. I’d just say, don’t assume it’s always a disaster waiting underneath... sometimes you get lucky.
Not every roof hides major rot. Sometimes, especially on newer homes or with good attic ventilation, you can get another decade without issues.
- Had a similar debate with myself last year. My house is 18 years old, original 3-tab asphalt shingles, Midwest climate (lots of freeze/thaw cycles). No leaks, no sagging, but the granules were starting to go.
- Did a bunch of research and checked the attic for any signs of moisture or mold—nothing. Decking felt solid everywhere I poked around.
- Ended up going with an overlay because:
- Shingles were still lying flat, no curling or cupping.
- Local code allows one additional layer.
- Budget was tight and I wanted to avoid the mess/cost of a full tear-off if possible.
- Contractor did warn me about potential downsides:
- More weight on the roof (not a huge deal for my pitch/structure).
- Shorter lifespan for the new layer (he said maybe 15 years instead of 20).
- If there’s ever a leak, finding the source could be trickier.
- It’s been two years—no issues so far. I do keep an eye out after big storms just in case. I figure as long as you’re realistic about what you’re getting (and don’t mind maybe replacing sooner), overlays can make sense in certain situations.
- That said, if I’d seen any soft spots or had an older house, I probably would’ve gone full tear-off. Like you said, “sometimes you get lucky,” but it’s definitely not one-size-fits-all.
- One thing I wish I’d done differently: spent more time checking for ventilation issues. My soffit vents are kinda small and I wonder if that’ll bite me down the road...
- Curious if anyone’s had overlays last more than 15 years? Or did they start to fail earlier than expected?
I’ve inspected a lot of roofs in the Midwest, and honestly, your experience lines up with what I see pretty often. Overlaying isn’t always the villain it’s made out to be—especially when the existing shingles are still flat and the decking’s solid. The big thing is exactly what you did: check for soft spots, moisture, and ventilation issues before making the call.
I’ve seen overlays last 12-16 years in our climate, but I’ll admit, it’s rare for them to hit that full “advertised” lifespan. The main problems usually pop up around year 10 or so—granule loss speeds up, and sometimes you get those weird leaks that are a pain to trace because water can travel between layers. Still, if you’re keeping an eye on things after storms and doing regular attic checks, you’re ahead of most folks.
Ventilation’s a sneaky one. I’ve crawled through more than a few attics where small soffit vents or blocked baffles led to early shingle failure or even mold. If you ever notice frost in the attic during winter or musty smells in spring, that’s usually a red flag. Retrofitting bigger vents isn’t always fun, but it can buy you extra years on both your roof and insulation.
One thing I’ll mildly push back on is weight—it’s not usually a problem for most modern homes, but I did see one case where an older ranch with some questionable rafters started to sag after a second layer went on. Not common, but worth mentioning for anyone with a house built before the ‘70s.
Overlay vs. tear-off really does come down to what you find under the shingles and how long you plan to stay put. If you’re planning to move in five years, overlays can make sense. If this is your “forever” house, I’d lean toward tear-off next time just for peace of mind and easier repairs down the road.
Curious if anyone else has had luck with overlays pushing past 15 years in our kind of climate? Most of what I see is closer to 12-13 before issues start cropping up...
Haven’t seen many overlays make it past 15 years around here, either. Usually by year 12, I’m spotting granule loss and those odd leaks that are tough to pin down—water just finds its way between layers. One thing I always tell folks: if you’re set on overlay, double-check the attic for any signs of moisture or sagging before you commit. And yeah, older homes with original rafters can surprise you... had a 1960s split-level where the second layer pushed things a bit too far and we ended up with some bowing. If you’re in it for the long haul, tear-off’s usually worth the hassle.