Page 239 - The Engineering Guide to LEED-New Construction Sustainable Construction for Engineers

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Special Circumstances and Exemplary Performance (LEED 2009 MRc2)
An EP point can be awarded in the construction waste management subcategory if the
diversion rate reaches at least 95 percent. One additional point for EP is earned if

DeDIVERT ≥ 0.95(DeLANDFILL + DeDIVERT) (5.2.4)

5.3 MR Credit Subcategory 3: Materials Reuse

MR Credit 3: Materials Reuse (LEED 2009)
In LEED 2.2, MRc3.1 is worth one point for 5 percent reuse, and MRc3.2 for 10 percent
reuse is worth one point in addition to the point for MRc3.1. LEED 2009 has consolidated
both into the single MRc3 subcategory with similar varying points depending on
compliance, one point for 5 percent and two points for 10 percent. The intention of this
subcategory is to promote the reuse of salvaged goods in the marketplace.

USGBC Rating System MR Credit 3
LEED-NC 2.2 lists the Intent, Requirements, and Potential Technologies and Strategies
for this credit as follows, with notations for LEED 2009 changes included:
Intent
Reuse building materials and products in order to reduce demand for virgin materials and
to reduce waste, thereby reducing impacts associated with the extraction and processing of
virgin resources.
Requirements
Use salvaged, refurbished or reused materials such that the sum of these materials constitutes
at least 5% (for one point and 10% for two points in LEED 2009), based on cost, of the total
value of materials on the project. Mechanical, electrical and plumbing components and
specialty items such as elevators and equipment shall not be included in this calculation.
Only include materials permanently installed in the project. Furniture may be included,
providing it is included consistently in MR Credits 3–7. (As noted in Table 5.0.0, LEED 2.2
has a now modified MRc3.2 credit for accomplishing a 10% materials reuse rate.)
Potential Technologies and Strategies
Identify opportunities to incorporate salvaged materials into building design and research
potential material suppliers. Consider salvaged materials such as beams and posts, flooring,
paneling, doors and frames, cabinetry and furniture, brick and decorative items.
Calculations and Considerations (LEED 2009 MRc3)
The items that can be included in the Materials Reuse category can come from many
sources. Usually, only permanent items in the project from the 2004 CSI categories 3
through 10, 31.60, 32.10, 32.30, and 32.90 are included, but furniture and furnishings can
be included if they are consistently used throughout credit subcategories 3 through 7 as
noted in Table 5.0.3. If they are included, then they should also be added into the
denominators in the calculations. LEED 2009 requires that if salvaged furniture is taken
from the occupant’s previous facility, then they must have been acquired at least 2 years
prior to the initiation of the current project.
In general, there are two different classes of what may be referred to as salvaged
items. First, there are the items that are reused or salvaged from an existing facility on-
site, and then there are items salvaged from elsewhere.