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Heat duct insulation

I have forced air heating and would like to insulate the duct work in the unheated crawl space under the house. Found some duct wrap (R3) but would like something more. Would it be feasible to wrap the ducts with R 13 fiberglass and then wrap that with plastic or foil for moisture barrier? Looking for someway to instulate them economicaly but effiently!

Re: Heat duct insulation

If I were you I'd use the right Insulation, if you can't get it at an HVAC Supply House try Home Depot or Lowes, don't forget the foil tape. Do it right, Do it once Good Luck!!!:)

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