Forum discussion
CS-2009 EAp2: Minimum Energy Performance
We are assessing a C&S 2009 project. We have two sheltered walls with neighbors on both sides. The walls from the neighbors are not along all the project walls. The question here is if all the sheltered walls need to have insulation?? Or the insulation needs to be only on the non-sheltered parts?
Many thanks!
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5907 thumbs up
October 10, 2014 - 4:02 pm
I am not sure what you mean by sheltered walls. The walls for conditioned and semi-conditioned space need to be insulated. If it is a shared wall with the same temperatures on both sides you would model it as adiabatic and technically it would not need to be insulated. Practically what happens if the neighbor goes away? Reference ASHRAE 90.1-2007 Section 5 for the terminology used to describe what does and does not need to be insulated.
Ana Paula Quiros
Architect, LEED AP BD+CLivet Consulting
October 10, 2014 - 5:09 pm
It is actually a party wall with aprox. 15 inches of separation from the neighbors walls.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5907 thumbs up
October 10, 2014 - 5:45 pm
If the 15 inches is connected to the outside then it is an exterior wall.