what is the area of reference to calculate the number of parking spaces?
gross floor area or usable floor area?
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NC-v4 LTc7: Reduced parking footprint
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area of reference
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Kimberly Schlaepfer
Sustainability Coordinator LEED AP O+M, BD+C75 thumbs up
February 19, 2016 - 5:52 pm
Hi Mark,
I am not sure I understand your question. What are you trying to calculate? The number of spaces to provide to reach a 20% reduction? Let me know and I can try and help out!
Mark Daub
Drees&Sommer4 thumbs up
February 22, 2016 - 3:19 am
Hi Kimberly,
I wasn't very specific, was I?
As I understood, the first step is to calculate the max. allowable number of new parking spaces according to the base rate calculation in table 1.
For an office building with max. 100,000 ft2 (9 300 m2): 3.4/1,000 ft2 (3.67/100 m2). The qestion is which area of the building is used for this calculation, gross floor or usable area?
In Germany for example we use the usable office area (tecnical rooms and stairs don't need parking).
We want to acheive this credit for a campus with central parking facilities. So another question is, if the calculation rate for each individual building (=higer base rate) or all the campus buildings togehter (=lower base rate) should be used.
Kimberly Schlaepfer
Sustainability Coordinator LEED AP O+M, BD+C75 thumbs up
February 22, 2016 - 11:26 am
Hi Mark,
The reference guide does not make this clear, however, we have been assuming LEED expects us to use the gross floor area value rather than the usable floor area for the parking calculations. If you wanted, I assume LEED would be okay with a project using usable floor area if they wished, because this would yield a greater reduction in parking. However, for some space types, simply using the usable floor area, would provide an unreasonably small number of parking spaces for the building.
To answer your second question, if you are pursuing this credit for a campus, you must calculate the base ratio of parking for each individual building type on the campus and then combine the data to determine the total number of allowable parking spaces.
Does that make sense? Let me know if that doesn't seem clear!
Thanks