How about this out of the IRC?
N1102.1 Thermal performance criteria. The minimum required insulation R-value....(other than opaque doors which are governed by Section N1102.1.3)....

Section N1102.1.3 Opaque doors. Opaque doors separating conditioned and unconditioned space shall have a maximum u-facto of 0.35. One opaque door shall be permitted to be exempt from this U-factor requirement.

I'm a little rusty on U factor conversion to R-value, does R-2.86 sound right? That would mean about an inch of fiberglass batt insulation, right?

__________________
Jim Luttrall
Mr. Inspector.net, Inc.
Allen, Texas 75002