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hi i am dan i can help you with this. first the exact cause for the insulation being wet must be determined. if it just recently get wet for some reason there should be no reason to replace it. if it has constantly been getting wet and is degraded then it should be replaced. is it fiberglass duct you have or metal duct wrapped with fiberglass insulation?
if it is constantly wet it can grow mold. i would ask them why it got wet and what are they going to do to prevent it from getting wet again
metal duct will be made out of all sheetmetal and secured and sealed. then wrapped with fiberglass wrap for insulation. fiberglass duct is ducts that are made completely out of compressed fiberglass. if there is a lack of insulation or insufficient insulation the hot air in the attic will form condensation on the exposed metal duct. if the insulation is removed it must be replaced as stated duct work must be insulated properly.fiberglass insulation is safe but another option is bubble wrap insulation. it is foil faced bubble wrape made out of plastic. any old fiberglass should be removed bagged and taken out of house.
yes if insulation is continually wet or gets very wet at once it degrades and becomes ineffective and should be replace. i have not used sheep wool for insulation but if it is at least an r-8 value and has a foil faced vapor barrier they it can be used
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i have never used it. all i would use is either fiberglass or bubble wrap insulation. any insulation used must have a R-8 ratting and provide an adequate vapor barrier to prevent condensation. if that answers your question or if you have any more questions about this please let me know and if you could rate me on my service by selecting one of the 5 stars at the top of your page i would appreciate it. thank you
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