furnace ductwork insullation

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#1

Originally Posted By: dkanakis
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hi everyone,


well this is my first time up here at the boards and i hope someone can offer some sort of an answer.


Almost always, i’d say 90% of the time, here in the new york area, when i come across a furnace - the ductwork is never insullated. However the other 10% of the time i see usually fiberglass insullation on the ductwork. Is it supposed to be insullated for the obvious reasons or is there a downside to insullating ductwork. Usually the ductwork im talking about is for heat only, though i have seen the same situation with quite a few systems which have both heat and a/c through the same ducts.


thanks


dennis

#2

Originally Posted By: rsummers
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Ive read some where that it is common in homes with basements that are a functional part of a home to have the duct work uninsulated. I think if the area had direct communication with the out side air that I would surely write it up. May be some on from the East coast would know how common it is and why.

#3

Originally Posted By: jburnell
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Dennis


Ductwork in the house does not need to be insulated, only the ducts that go thru unconditioned space (vented crawlspace, attics, or thru an exterior wall) then it should be insulated to R-8. It doesn’t hurt to insulate it all, makes it quieter and saves a few bucks on the heating bill, just make sure the right insulation is used, don’t want to get any fiberglass into the forced air system.


John