Page 330 - The Engineering Guide to LEED-New Construction Sustainable Construction for Engineers

292 Cha pte r S i x

VAPO Area compliant with both view criteria in private office k (the VAPO values
k k
represent a subset of the VA values)
j
VC View compliance for the project (in percent)
RA Floor area of regularly occupied room area j (including private offices)
j
RAPO Floor area of private office k (RAPO values represent a subset of RA
k k j
values)
RAT Total floor area of all regularly occupied room areas
The total floor area of all regularly occupied room areas, as previously listed in IEQc8.1, is

RAT = ∑
RAj for all regularly occupied room areas j (6.8.2)
j

And therefore VC for the project can be calculated as

⎛ ⎡ ∑ ⎞ ⎛ ( ∑ ⎞ ⎤
⎜ ⎢ VAj ⎟ ⎜ RAPO -VAPO ) k ⎟ ⎥
k
⎥
VC = 100× ⎜ ⎢ j ⎟+ ⎜ k ⎟ for all k where (VAPO )/
T
K
⎟
⎢ ⎜ ⎢ ⎜ ⎝ ⎣ RAT ⎟ ⎜ RAT ⎟ ⎠⎥ ⎥ ⎦ (RAPO ) ≥ 0.75 (6.8.6)
⎠ ⎝
K
The term to the left of the addition sign in Eq. (6.8.6) represents the total floor areas
in regularly occupied spaces that comply with both view criteria, and the terms to the
right of the addition sign represent the additional amount that may be included for
private offices where at least 75 percent of the private office area meets both criteria. The
project then complies with IEQc8.2 if
VC ≥ 90 (6.8.7)

Special Circumstances and Exemplary Performance
Since the location of windows and large work areas is an intricate part of the architecture
of a building, this credit has been labeled with an EB from the USGBC. It is more difficult
to change in an existing building.
There is an EP point available for IEQc8.2 for both versions, although no specific
criterion is set for it in LEED 2.2. LEED 2009 has the criteria for the IEQc8.2 EP point
specified as also meeting at least two of the following four options for 90 percent or
more of the regularly occupied spaces:

1. “Have multiple lines of sight to vision glazing in different directions at least
90 degrees apart.”
2. “Include views of at least two of the following: vegetation, human activity, or
objects >70 ft from the exterior of the glazing.”
3. “Have access to unobstructed views located within the distance of three times
the head height of the vision glazing.”
4. “Have access to views with a view factor of three or greater as per the Heschong
Mahone Group Study, Windows and Offices, p. 47.”