What R-factor for duct

[smp7015]

What R-factor whould your recomend for duct in a Houston, Texas attic?

[beenthere]

Sorry, don't have my code book at home with me, or I'd tell you what the minimum code requirement is for your area.


Your contractor should know.

[dan sw fl]

R-6 should be Standard.

I suspect that R-8 duct would not be in common usage.

[cem-bsee]

R8 or more! the biggest $$ in the labor -- savings from now on --
be sure all joints & seams have mastic first!

[old yeller]

The highest you can find, period.

Lowes has foil-wrapped r-8 off the shelf.