My forced air heaing/cooling system's ducts are located in an unconditioned, well-ventilated attic, right above the floor insulation. They are made of 1" duct board. Anyone know of any product to boost the insulation of the duct board? What I have in mind is another piece of duct board, 1 or 2" thick, shaped into a U, so I can lower it over the existing ducts and increase their insulation on the two sides and top.
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Ray