"Martin, What the code required at a certain time and what the builder did are two separate issues. Not until recently did you start to see real enforcement of the energy code. There was no code prior to 1975 and what was used from…"
The 2009 Michigan Uniform Energy Code follows closely with the 2009 IECC. Section 402.1.4 Total UA alternative addresses the method that RES Check follows. The values used for assemblies can be derived from the ASHRAE Handbook. In…"
"In addition to Isaac's response below, if you're insulating the roof deck and encapsulating the attic, be sure to model the ductwork as being within building envelope. This will reduce energy losses through the ducts. "
"The best way to determine what RSU does with scenarios like this is to do it both ways, then compare the reports to each other. The "component constructions" report (found in the Load section) will show you the gains losses attributed to…"
The E-84 only test has was removed from the IRC between the 2003 & 2006 code cycle. The exceptions you are speaking of are for THERMAL barriers not ignition! You need an ignition barrier unless the specific foam you are using…"
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