How do you insulate ductwork on a roof?

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Install ductwork so that it is in direct contact with (i.e., laying on) the ceiling and/or truss lower cords. Use metal, flex, or fiber board ducts that are insulated to code. The duct insulation should include a vapor barrier cover. Mechanically fasten and mastic-seal all duct connections. Test total duct leakage.

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