I am having a conundrum at work. What energy code to use for the project I am working on. If I use ASHRAE 90.1 I will not be required to have vestibules. If I use the 2003 IECC (International Energy Conservation Code) vestibules would be required according to chapter 8. If I use AHSRAE, the MEP engineer has a lot more work to do, but less for me. I Think I will use the DaVinci Code instead.
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