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

I get where you’re coming from, but I’ve seen a lot of folks regret skipping the tear-off, especially after a big hailstorm or wind event. That second layer can hide issues you’d never spot until it’s too late... and then you’re dealing with rot or insurance headaches. Sometimes the “nuclear option” is actually the safer bet long-term, even if it means less fishing this year.

I wrestled with this same decision last year. My house is older, and I was tempted to just add another layer to save some cash, but I kept thinking - what if there’s hidden rot or soft spots under there? Anyone else find stuff like that when they tore off old shingles? I ended up doing the full tear-off, and yeah, it was more work (and money), but at least I know what’s under my roof now. Still kinda wonder if I overthought it, though...

I kept thinking - what if there’s hidden rot or soft spots under there? Anyone else find stuff like that when they tore off old shingles?

That’s the part that always gets me too. I’ve managed a few properties where we went the “just add a layer” route, and it was fine… until it wasn’t. One place in particular, we added a second layer over some old three-tabs, and about two years later, we started seeing weird sagging in one corner. Pulled everything off and, sure enough, there was a patch of rotten decking that had been hiding under both layers. Ended up costing more to fix than if we’d just done the tear-off in the first place.

But I get why people hesitate. Full tear-offs are a pain - louder, messier, and the bill stings. Still, with older houses (especially anything pre-80s), you never really know what’s going on underneath until you look. I’ve seen everything from ancient cedar shakes under asphalt to random holes someone patched with scrap plywood. Sometimes you’re lucky and it’s all solid, but sometimes… not so much.

Did you notice any insulation issues when you did yours? Sometimes after a tear-off, folks realize their attic is barely insulated or has weird gaps around vents. It can be an opportunity to fix those things while everything’s open, but it’s also one more thing that can add to the cost.

I wouldn’t say you overthought it. Peace of mind counts for something, especially if you plan on staying in the house for a while. Plus, some warranties only apply if there’s a full tear-off - at least with the shingle brands around here (Midwest). But yeah, it’s always a gamble on whether you’ll find something nasty underneath or not.

Curious - what kind of shingles did you go with after the tear-off? And did your contractor mention anything about ventilation upgrades? That seems to come up every time I do a roof project now...

“Still, with older houses (especially anything pre-80s), you never really know what’s going on underneath until you look.”

That hits home. I once thought we were safe just layering over the old shingles on a ‘78 colonial, but when we finally did a tear-off a few years later, we found a whole section by the chimney where water had been creeping in for ages. It’s wild how much can hide out of sight. As for ventilation, totally agree - it’s become standard for contractors to push ridge vents or more soffit vents now. Sometimes I think they go a bit overboard, but after seeing moldy rafters once, I kinda get it. Did you end up needing to add insulation or just patch the decking?

Man, I hear you on the hidden surprises. Every time I’ve done a tear-off on an older place, there’s always that “uh oh” moment - usually around a chimney or vent. Sometimes it’s just patching the decking, but once I found insulation so soggy it looked like oatmeal. Ventilation’s a pain, but after seeing what trapped moisture does... yeah, I’ll take a few extra vents over another moldy mess any day.