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Worth it to upgrade R4 attic flexible ducting to R12?

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HighPotential

HighPotential

Electrical
Joined
Sep 24, 2002
Messages
50
Location
US
I have just installed R4 flexible duct in my rather well ventillated and somewhat isulated attic (radiant roof sheathing). I have a substantial amount of this R4 duct in the attic. Some runs are nearly 20 ft. Would it be worth my while to buy a larger R8 flexible duct product and slip it over my R4 ducts to give me R12? My supply and return plenums are very well insulated. I am in Southern California environement.

Thanks,

HP
 
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