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I’ve actually torn off a few roofs where there was some rot under the old shingles, but honestly, it’s not always because of the overlay itself. Usually, it’s poor ventilation or an existing leak that gets trapped and can’t dry out. If you’ve got good attic airflow and the first layer is in decent shape (no soft spots, no curling), a second layer isn’t automatically a disaster. That said, in climates with lots of freeze/thaw, I’d still lean toward full tear-off if you want to play it safe long-term. The upfront savings from an overlay can disappear fast if you end up chasing hidden damage down the road.
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