I get why people do the overlay, especially if the first layer’s still in decent shape. But I’ve always worried about the added weight, especially on older homes. My neighbor did a second layer and a few years later started having issues with sagging rafters... guess it depends on the structure, but that made me nervous.
That’s exactly what made me pause on the overlay route. Our place is pushing 80 years old with original rafters, so I kept picturing the weight just compounding every time it rained or snowed. I get that it saves money and mess, but it feels like kicking the can down the road sometimes.
When we had two roofers out, one was all for overlay if there weren’t soft spots, but the other said even a single extra layer can stress older wood, especially if you’re in a climate with heavy snow like we get. Plus, you miss seeing what’s under there—like rot or old leaks that never got fixed right.
I ended up biting the bullet and doing a full tear-off. Cost more up front but at least now I know what’s above my head. If your rafters are beefy and you don’t get much snow, maybe an overlay is fine... but for older places, I’d want to see what shape everything’s in before stacking on more weight.
You nailed it—overlaying on an old roof can be like stuffing another sandwich in a lunchbox that’s already bursting at the seams. I’ve seen rafters from the 40s take one extra layer and then groan every winter under the snow. The peace of mind from a full tear-off is hard to beat, even if the wallet feels lighter for a bit. Ever see those “mystery leaks” that only show up after an overlay? Not fun. Sounds like you made a solid call.
I’ve seen too many overlays that look fine on day one, but by year five, you’re dealing with trapped moisture and ventilation issues—not to mention the added load. It’s not just about the rafters, either. The old shingles underneath can actually accelerate heat buildup and mess with your attic airflow, which is a big deal if you care about energy efficiency. I get why folks want to save money upfront, but sometimes that “quick fix” ends up costing more in the long run, especially if you’re in a region with heavy snow or wild temperature swings.
One thing a lot of people overlook: overlays make it nearly impossible to spot deck rot or hidden structural problems until things get ugly. Full tear-off lets you address those issues before they become bigger headaches. Plus, from a sustainability angle, a clean start means you can use recycled or cool roofing materials much more effectively. Overlaying might seem easier, but it rarely lines up with best practices for longevity—or for the environment.
- Seen both sides of this with a few buildings I manage. Overlay is tempting when budgets are tight, but man, the hidden problems can sneak up fast.
- Had one place where we did an overlay to save cash—three years later, surprise: mold in the attic and a sagging spot nobody caught until it was too late.
- Full tear-off is a pain (and noisy as heck), but at least you know what you’re dealing with underneath. Plus, insurance companies seem to like it better for claims.
- Only time I’d even consider an overlay is on a small shed or garage, not a main building. Just not worth the gamble for me.
