[Equest-users] Fenestration and Window to Wall Ratio

James Newman James.Newman at me-engineers.com
Tue Feb 8 15:29:14 PST 2011


This paragraph comes directly out of the ASHRAE 90.1-2007 User Manual:

"Window-Wall Ratio: The window-wall ratio is the ratio of vertical fenestration area to gross exterior wall area. The fenestration area is the rough opening, i.e., it includes the frame, sash, and other nonglazed window components.  The gross exterior wall is measured horizontally from the exterior surface; it is measured vertically from the top of the floor to the bottom of the roof. The gross exterior wall area includes below-grade as well as above-grade walls. It is necessary to calculate the window-wall ratio with all compliance options, since this information is need with the prescriptive option, the trade-off option, and the energy cost budget method."

James M. Newman, EIT, LEED AP
project engineer / energy analyst


-----Original Message-----
From: Sunayana Jain [mailto:sunayana_jain at neo.tamu.edu] 
Sent: Tuesday, February 08, 2011 4:20 PM
To: James Newman
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Fenestration and Window to Wall Ratio

Hi James,

As per my understanding, window wall ratio is considered for above grade walls only for each orientation of building (not floor to floor).

Thanks,

Sunayana Jain

LEED AP, EIT

Energy Engineering Specialist

----- Original Message -----
From: "James Newman" <James.Newman at me-engineers.com>
To: equest-users at lists.onebuilding.org
Sent: Tuesday, February 8, 2011 5:29:50 PM GMT -05:00 US/Canada Eastern
Subject: [Equest-users] Fenestration and Window to Wall Ratio





When calculating the window to wall ratio for your baseline building, should you calculate this percentage as 

  

·          an entire building? 

·          each building elevation? 

·          every floor elevation? 

  

Has anyone had an interpretation on this issue?  I was reading through the 90.1 User manual and discovered that both above grade walls and below grade walls should be considered for the wall to wall ratio which leads me to believe the calculation should be done as a whole building percentage. Just curious if someone knows the correct answer. 

  

Thanks, 

  

James M. Newman, EIT, LEED AP 

project engineer / energy analyst 

  
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