[Equest-users] LEED EA comments about Model Area and the architecture GFA

Annie Marston A.Marston at eb-engineers.com
Thu Feb 28 06:26:42 PST 2013

Hi Jenny,

We have had this issue before as well, there is a box on EAp2 / EAc1 (sorry I never remember which until I am in the form) where you can tick to say your energy model has a different floor area from the architecture plans. This seems to work, you can then write a narrative in response to the comments explaining why.

The second thing that LEED seem to look for is that the floor area is consistent across credits. I think that the tick box in EAp2 / EAc1 negates the need for that but it is worth checking with the other LEED credits to see if you can align with them.

I don’t know how helpful that is but I thought it might be worth mentioning.

Good luck


Dr. A. Marston, Ph.D. LEED(r) AP BEMP
Head of the Building Performance Group

Ebert & Baumann Consulting Engineers, Inc.
An  Enterprise  of  the  Ebert-Consulting Group

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a.marston at eb-engineers.com<mailto:a.marston at eb-engineers.com>

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jenny Zhang
Sent: Thursday, February 28, 2013 8:10 AM
To: 'Patrick J. O'Leary, Jr.'
Cc: 'equest-users at lists.onebuilding.org'
Subject: Re: [Equest-users] LEED EA comments about Model Area and the architecture GFA

Thanks very much for your quick reply.
It is a 4-floors retail podium and about 27 floors office tower. Also has a big basement, the total gross floor area is about 1121319 sqft. 40,000sf is a big value but a small percentage for my building.
No plenum zones in our models and I think the area discrepancy is because the outlines of our models’ footprint is not the same as the architecture drawings. I have done some simplifies when building the geometry.

I will check according to your reminders. It would be lucky if  some outdoor areas is in architecture gross floor areas.

Do you know how small the difference could be accepted by the review team?



From: Patrick J. O'Leary, Jr. [mailto:poleary1969 at gmail.com]
Sent: 2013年2月28日 20:59
To: Jenny Zhang
Cc: 'equest-users at lists.onebuilding.org'
Subject: Re: [Equest-users] LEED EA comments about Model Area and the architecture GFA

is your building single story or multiple story?  40,000 sf is a huge difference. two things i would check first are:

1.  are parts of the building, in the architectural square footage, exterior?  i.e the 1st floor plan sf the architect is using has canopy area, or is there a walkway under part(s) of the building if it is multistory?

where did the architect get the sf number they are using?  and how does it impact calculations in other points?

2.  does part of the building have plenums?  plenum zones in the sv-a reports will show up in the area sf so if you have a vertical building & some floors have plenums while others don't this can skew the sf on the sv-a reports though not on the sf reported as the building/floor footprints.

On 2/28/13 5:40 AM, Jenny Zhang wrote:
Dear All friends,

I got a LEED EA Cr1 review comment from GBCI.
It’s about the model area and architecture Gross square footage. The total building area in the simulation report is 1,121,319.6 square feet and the area in architecture documents is 1,161,727.32 square feet. The comments said that the area value in the model should be consistent with all other credits and LEED online and/or provide a supplemental narrative explaining the discrepancy.

As a energy modeller I think all of you know that the area in the model could not be easily consistent with the architecture CAD drawings. Although In the footprint drawing stage I was very care about each floor’ area(because I understand the area in the model should be consistent with CAD drawings especially when it was for a LEED model), it still results discrepancy in the two area values.

Now the difference about the two area values is about 40407.4 sqft (3754sqm), and it is only 3% of the total area. It’s hard to revise the model in this stage, but what I should do to explain the discrepancy. Does anybody here have experience to deal with this problem?  And do you know how much difference (%) could be accepted by the review team?

Thanks for your attention.

Jie Zhang

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