Can’t help but side-eye the idea of just layering on more shingles, especially from a green perspective. All that extra weight and material ends up in a landfill sooner or later. Full tear-off’s a pain, but at least you know what you’re dealing with underneath... and it’s better for long-term efficiency. I’ve seen overlays trap moisture and just create more problems down the line. Shortcuts feel good until they don’t.
Had to make this call a couple years back on a 12-unit building—flat roof, old torch-down under two layers of shingles. I get why folks want to just add another layer (cheaper, less mess), but we ended up doing a full tear-off. The extra cost stung, but honestly, it was worth it. Found some rotten decking and even a spot where squirrels had chewed through. Would’ve missed all that with an overlay.
I’ve seen overlays work okay on smaller, steeper roofs where the structure can handle the weight and there’s no sign of leaks or soft spots. But in my experience, you’re just kicking the can down the road. Plus, if you ever need to do repairs later, it’s a nightmare cutting through all those layers.
Not saying overlays are always bad, but for bigger buildings or anything with existing issues, I’d rather deal with the hassle up front than risk bigger headaches later.
That’s a good point about uncovering hidden damage—had a similar thing happen with my folks’ place. We thought about just slapping another layer on their old asphalt roof, but when we finally bit the bullet and tore it all off, we found a patch of decking that was basically mulch. Would’ve never known until it got way worse.
I get why overlays are tempting, especially with how expensive everything’s gotten. But I always wonder about the long-term waste, too. Every extra layer just means more material heading to landfill eventually, and it can make recycling the old stuff a pain. Plus, if you’re thinking about solar or even a green (planted) roof down the line, you really want a clean slate.
Not saying overlays never make sense—my neighbor did one on his little garage and it’s holding up fine—but for bigger roofs or anything flat, I’d rather deal with the mess now than risk mold or critters later. Just seems like there’s always something lurking under those layers...
- Seen this a bunch after storms—people want to save cash and just add a layer, but once you pull everything off, you find rot or old hail damage hiding underneath.
- Did a job last spring where the decking was so soft you could poke a screwdriver through it... wouldn’t have known if we hadn’t stripped it down.
- Overlays can work on simple, steep roofs, but on anything with valleys or low pitch, it’s asking for leaks down the line.
- Also, insurance sometimes won’t cover issues if there’s more than one layer. Learned that the hard way on a claim last year.
- It’s messier and pricier up front, but ripping it all off usually saves headaches later.
Not gonna lie, I get why folks want to strip everything down, but sometimes it’s just not practical—especially if you’re trying to keep waste out of the landfill. I’ve seen overlays work fine on smaller, well-ventilated roofs, especially with newer eco-friendly shingles. Yeah, you risk missing hidden damage, but if the decking’s solid and you’re not stacking layers forever, it can be a decent compromise. Just wish more people factored in the environmental side before tearing off tons of old material.