[Bldg-sim] ASHRAE 90.1 Window to Wall area definition

Bishop, Bill bbishop at pathfinder-ea.com
Thu Oct 15 10:40:13 PDT 2015


Expanding on Michael’s and Elizabeth’s comments…
Note that Appendix G. specifically refers to “above-grade wall area” for determining fenestration percentages (in 2007, 2010 and 2013 versions).
Also note that “parking garages with natural or mechanical ventilation are not considered enclosed spaces” per 90.1 definition of space. Therefore, any “walls”, whether above or below-ground, are not part of the building envelope, are therefore not technically walls per 90.1 and wouldn’t be included in WWR calculations.

William Bishop, PE, BEMP, BEAP, CEM, LEED AP | Pathfinder Engineers & Architects LLP
Senior Energy Engineer

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From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Shaun Martin
Sent: Thursday, October 15, 2015 1:39 PM
To: 'Jones, Christopher' <Christopher.r.Jones at wspgroup.com>; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] ASHRAE 90.1 Window to Wall area definition

Page 213 of 90.1-2010 says “above-grade”

Shaun

Shaun Martin LEED-AP, BEMP
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From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Jones, Christopher
Sent: Thursday, October 15, 2015 10:15 AM
To: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: [Bldg-sim] ASHRAE 90.1 Window to Wall area definition

I know this question has been asked before but I could not find a related thread.

90.1 states that the WWR is based on the gross wall area and the definition of gross wall area includes below ground walls as well as above ground walls..  Including the below grade walls can make a significant difference in the WWR for typical urban high rise buildings with a number of below grade parking floors.

Can someone confirm that the WWR calculation is based on above grade wall area plus below grade wall area?


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Christopher Jones, P.Eng.
Senior Engineer

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