The vestibule is actually rectangular, but the exterior door is 90 degrees off of the interior door, so the walking path is not straight. The entire vestibule has walkoff carpet tiles and is roughly 10'-3" x 6'-6". In measuring the walking distance between the two doors (and therefore checking for 10' compliance), I have three options: (1) measure straight diagonal line from (center of) exterior door to (center of) interior door (walking distance = 9'-5"); (2) measure "L-shaped" walking distance from exterior door to interior door, as if only robots use the entrance (walking distance = 12'-9"); or (3) measure the arc length of a curved walking path from exterior door to interior door (walking distance = 10'-1"). Which measuring method is most appropriate?

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Michelle Halle Stern

Principal

UpFront Regenerative Design

LEEDuser Premium Member

99 thumbs up

Thu, 07/21/2016 - 18:45

I assume that you are not planning to change the dimensions of the vestibule. In that case you should show the most reasonable pathway representing actual use that meets the 10' requirement, perhaps giving a range of distance.

Lyle Axelarris

Building Enclosure Consultant

BPL Enclosure

LEEDuser Basic Member

58 thumbs up

Thu, 07/21/2016 - 18:57

That is correct. Dimensions are set. We may be able to move one of the doors over a few inches to gain some path distance but otherwise we are really constrained. I think option 3 (arc from ctr. of door -to- ctr. of door) is the most realistic travel path, so I will add that to the drawings. Thanks

Amari Roskelly

Sustainability Coordinator

Jacobs Engineering

LEEDuser Premium Member

2 thumbs up

Thu, 07/21/2016 - 19:10

We have had a similar issue arise in a previous project. We were able to pursue this credit via alternative compliance path. We had an entryway system that encompassed an entire angled vestibule at roughly a 45 degree angle. The team was able to demonstrate that while the entryway system wasn't a straight 10', the number of steps and total path traveled would equal the required 10' to meet the credit requirement. We provided a written narrative and a highlighted exhibit demonstrating that the number of steps and total distance traveled would meet the requirement. The reviewer approved for the credit without any issues. Hope that helps and provides an alternative to pursuing the credit.

Lyle Axelarris

Building Enclosure Consultant

BPL Enclosure

LEEDuser Basic Member

58 thumbs up

Thu, 07/21/2016 - 19:40

Thank you, Amari. Can you tell me more about the highlighted exhibit that you used. How deep into it did you go? I don't want to make this a science fair project, but I want to avoid doubt from the reviewer.

Amari Roskelly

Sustainability Coordinator

Jacobs Engineering

LEEDuser Premium Member

2 thumbs up

Thu, 07/21/2016 - 20:04

Of course! It was really quite simple honestly. We drew a dimension line from the door, then another one to follow the angle and the last one finished to the interior door. It was just three straight lines that included dimensions, following the path that a typical individual would walk. In the narrative, we supplied the data of a person's average stride length then included a description as to how a person would travel in that space, walking with an average stride and provided that total calculated length.

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