Since the credit template is not linked to the Gross Floor area in PIf2 (as it is in other relevant credits), does that mean the floor area in the flushout calcs should be net area, as it is done for IEQp1?
It would make sense to only count the area inside the air barrier, but since IEQc4.x credits incorrectly refer to breathable space as "inside of the weather-proofing system", I'm not sure if the reviewer will have a similar view of what should be counted for flushout calcs.
With about 2 feet separating the air barrier and "weather-proofing system" in some of our Alaskan walls, should I use gross floor area (which is akin to "inside of weather-proofing system") or should I use breathable space (inside air barrier, which is what is used for ASHRAE 62.1 calcs).
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Lyle Axelarris
Building Enclosure ConsultantBPL Enclosure
64 thumbs up
October 8, 2015 - 4:17 pm
Any input would be appreciated. Bueller?.... Bueller?
Dylan Connelly
Mechanical EngineerIntegral Group
LEEDuser Expert
472 thumbs up
October 8, 2015 - 4:34 pm
I've always used gross. I've never been questioned on it. There isn't even much to fill out in the credit.
Lyle Axelarris
Building Enclosure ConsultantBPL Enclosure
64 thumbs up
October 8, 2015 - 4:40 pm
Thank you, Dylan. Given the thickness of our walls, and the difficulty of keeping the space above 60 degrees during a winter flushout, the ~30 million cf difference between gross and net area makes a difference.
Dave Hubka
Practice Leader - SustainabilityEUA
LEEDuser Expert
530 thumbs up
October 8, 2015 - 5:15 pm
We also use gross and do not get questioned.
A few years back we received the following review comment "please note that all spaces that are occupiable must be flushed out".
So technically you could subtract the "non-occupiable" (walls, columns, mechanical shafts,etc.) floor area from the gross floor area and meet the intent of the credit. I'd recommend you clarify the area difference between GSF and area flushed out before submitting to GBCI for review.