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Can I leave the old insulation material on as an insulator under new vinyl siding?

April 26, 2017insulation insulator leave material vinyl siding

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Can I leave the old insulation material on as an insulator under new vinyl siding?

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Ted writes from Rutherford, New Jersey: “I have a 100-year-old Colonial house in Northern New Jersey. Original siding is cedar clapboard. Back in the 1940’s or 1950’s the clapboards were covered with a 1/2″ black insulation board (it is like a compressed Celotex-type material) and then asphalt siding shingles on top of the insulation. What is that old insulation material called, and can I leave the old insulation material on as an insulator under new vinyl siding? The old asphalt shingles are coming off.” Answer: Owens Corning residential insulation products are PINK and the company has a trademark for the color pink when used with building materials. I am not sure what insulation you have there, but I have never heard of any limitations on what vinyl siding can be installed over.