"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…"
ACCA is a non-profit association serving more than 60,000 professionals and 4,000 businesses in the HVACR community, working together to promote professional contracting, energy efficiency, and healthy, comfortable indoor environments.See More
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…"
"Cory is right, watch out for thermal barrier requirements as well. In it's simplest form if you can walk up to it on any given day it will require a thermal barrier. if it is harder to get to you will need an ignition barrier. …"
"Thanks fmrubinstein. Hard for me to imagine that though considering the energy it takes to make ceramics and most retrofit lamps have a ceramic base. Not to mention the copper for the circuitry and the additional glass. Still not…"
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