Glazing distributed uniformly in horizontal bands

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I want to modify the windows in an existing model so that they meet the
uniformly-distributed requirement. I'm trying to do this in the wizard,
and I know I will lose data from the detailed edit mode, which I will
deal with. However, I already used the "custom window/door placement"
tab, and this seems to override my desire to use the % window method.
How do I "undo" the custom windows/doors? Modify the .pd2 file?

William Bishop, EIT, LEED(r) AP

Bishop, Bill's picture
Joined: 2011-09-30
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The uniformly distributed requirement has been changed. You do not need to
do that anymore. As long as you have under 40% glazing you will not need to
change the area or locations of your glazing. Hope that helps.


Steve Mignogna

Steve Mignogna's picture
Joined: 2011-09-30
Reputation: 0


I believe you are referring to the Addenda a - G4.1c to ASHRAE
90.1-2004. I have not reviewed all of the ASHRAE addenda, and the USGBC
requires an ASHRAE addendum to be applied to the entire LEED submittal
(per this document,
so I have been sticking to 90.1-2004 without addenda. If anyone has an
opinion on whether or not to use the addenda for LEED, please share.

However, I also am doing modeling for New York State Executive Order
111, which requires me to use the modeling requirements from the Energy
Conservation Construction Code of New York State (ECCCNYS). New York
apparently has not gotten the "uniform distribution not required" memo.

Is there a list of all the DOE-2 commands somewhere? It would be helpful
for deciphering my .pd2 file.



Bishop, Bill's picture
Joined: 2011-09-30
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That worked. Thanks.


Bishop, Bill's picture
Joined: 2011-09-30
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I found this CIR, which should help to clarify whether or not you can use
the addenda. It seems like you should be fine with using just that one part
of the addenda.

*20/2007 - * *Credit Interpretation Request*
The intent of this credit is to "Achieve increasing levels of energy
performance above the baseline in the prerequisite standard to reduce
environmental and economic impacts associated with excessive energy use."

The requirements of Option 1 of this credit are as follows:
- Demonstrate a percentage improvement in the proposed building performance
rating compared to the baseline building performance rating per ASHRAE/IESNA
Standard 90.1-2004 (without amendments) by a whole building project
simulation using the Building Performance Rating Method in Appendix G of the

Table G3.1, number 5.c. in Appendix G of the Standard concerns vertical

The baseline requirement is as follows:
- Vertical fenestration areas for new buildings and additions shall equal
that in the proposed design or 40% of the gross above-grade wall area,
whichever is smaller, and shall be distributed uniformly in horizontal bands
across the four orientations.

The exception that we would like to take is as follows:
- The intent of the baseline requirement is to encourage thoughtful
fenestration orientation and glazing percentage of a building that results
in energy savings. The Project is an exception to this approach.
- The facility exists for the purpose of sports viewing. The field-side
glazing exists in order for the facility to function as intended.
- The exterior walls of concessions, restrooms, and other ancillary spaces
typically do not have glazing. Concessions and restrooms are typically
semi-heated only. Modeling the baseline with glazing distributed over the
concessions and restrooms doesn't seem to meet the intent of the Standard.
- We would like to model the baseline building performance and the proposed
building performance with the same vertical fenestration-the actual building
fenestration. We ask that this exception is made for the project.
* 5/13/2007 - * *Ruling*
The baseline and the proposed design can be modeled with the windows
distributed around the building as in the proposed design. The baseline
cannot have more than 40% window area as a percentage of total wall area. As
posted on the USGBC website, project teams can use addenda in the most
recent Supplement to the ASHRAE standards (see Addendum A documents
this change.

Steve Mignogna

Steve Mignogna's picture
Joined: 2011-09-30
Reputation: 0

LEED allows you to use any of the addenda to ASHRAE 90.1-2004. However,
if you choose to use one of the addenda you must apply every aspect of
that particular addenda. For example, if you choose to not distribute the
baseline building glazing equally around the building you must also apply
the changes made in addenda a effecting choice of BL system based on
project square footage, as well as the baseline supply air reset addendum.

Give addendum a a quick read through. There aren't all that many changes
made and you can easily incorporate the whole addenda into your project.

Robby Oylear, LEEDR AP

RobbyO's picture
Joined: 2010-11-03
Reputation: 0

I believe the wording is for the entire single addenda - you don't have to use a and b to use c, but if c has three parts you have to use all three.

"if a project team elects to use an addendum to an ASHRAE standard, this addendum must be applied to the entire LEED submittal"

David S Eldridge's picture
Joined: 2011-09-30
Reputation: 2000

I agree with David S Eldridge. I was told this at an ASHRAE sponsored
seminar for exceeding the requirements of Standard 90.1-2007. The speaker
was on the revisory committee. If any addendum is used (i.e. Addendum a),
then all aspects of that addendum must be applied consistently throughout
for LEED. The USGBC must also be notified.

Brett Fero, P.E., LEED AP

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Joined: 2011-09-30
Reputation: 0