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This help desk is a free resource intended for discussion purposes only. Neither BOMA, its chapters, affiliates, or Extreme Measures Inc.® are responsible for the information, comments or opinions expressed herein. For complete information, refer to the official publications of the standards themselves.

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Calculating dominant portion of walls

April 23, 2018

1. When calculating the dominant portion of a wall, do you include the frame with the glazing or is it only the glazing?

2. When calculating the dominant portion of a wall, it’s from floor to ceiling, but what happens if there isn’t a finished ceiling, therefore the floor joist and all framing is exposed. The calculation is from floor to what height?

David Fingret
Extreme Measures Inc.
April 23, 2018

Hi Rick,

1. The window frame is generally ignored. The glazing is almost always the vertically dominant portion of the wall.
2. You would have to consider the vertically dominant material to the unfinished ceiling. The 2010 standard does not account for this situation. The BOMA 2017 Office Standard does though by only considering dominant portion to a maximum of 8 feet.

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