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Yes tear it off. Overlays decrease the life of the new shingles dramatically. Look up NRCA national roofing contractors assoc.
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I would tear it off just to check on the condition of the wood underneath if it has been 35 years.
Al
Some people are like a Slinky. Not really good for anything but still bring a smile to your face when you push them down a flight of stairs.
A dead enemy is a peaceful enemy. Blessed are the peacemakers.
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Location: Royersford Pa.
Tear off means less weight on the roof. What kind of snow load do you get?
Twinn
Will post for food.
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A couple things to think about.
1. How is the current shingles laying down. If they are curling - tear off.
2. Look in the attic. If there is visible water leakage or darkening. I would consider tear off. Deck may have issues.
3. Check the warranty on the new shingles. There maybe a condition to the warranty if there is not a tear off.
4. I know snows not big there but the first 3 feet should be rubberized underlayment to protect the deck from ice dam damage. May or may not be an issue in your area. I know you have more ice storms than snow storms.
5. The weight may or may not be an issue depending on the roof rafters. My old house had 2x4's - not good for extra layers. This house has 2x8 - no issues with extra layers.
Ok - more than a couple things.
Do ask about the cost but I would recommend tear off. Much nicer job.
John
Always use the right tool for the job.
We need to clean house.
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Another good thing to check is the new roof's warranty. It may be contingent on a tear off.