Hi All,

I was checking a Comcheck compliance sheet for a project and the project was meeting compliance for ASHRAE 90.1-2010 using 60% WWR. I was really surprised by this and ran Comcheck myself (version 4.0.5.5) and found that I could get the envelope to pass with any amount of glazing as long as the total envelope UA was below the budget UA - regardless of glazing area.

I tried to see if I could do the same thing with IECC 2012 and it gave me an error but the program popped up a screen that told me to use ASHRAE 90.1-2010 because it does not have a max WWR limitation. See screenshots 1 & 2.

Is this really true? I was under the impression that we have to go with a performance route if the glazing exceeds 40% WWR? But that does not seem to be the case.

Appreciate the groups thoughts, thanks

Madhav

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MADHAV MUNSHI | BEMP, LEED AP BD+C

Kohler Ronan, LLC | www.kohlerronan.com
mmunshi at kohlerronan.com

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