Page 235 - The Engineering Guide to LEED-New Construction Sustainable Construction for Engineers

LEED Materials and Resour ces 209

• Any pavements that are crushed and reused on-site are included.
• Existing building items which are to remain as addressed in LEED 2009 MRc1.1
(building reuse—structural) can also be included but only if MRc1.1 is not applied
for.
• Existing building items which are to remain as addressed in LEED 2009 MRc1.2
(building reuse—nonstructural) can also be included but only if LEED 2009 MRc1.2
is not applied for.
• Other building materials salvaged and reused on-site can contribute to this
credit if they are not included in the MR credit 3 calculations.

Using these criteria, the following variables can be defined:
DeBLDGREUSE The items reused in the building as defined in LEED 2009 MRc1.1
if MRc.1.1 is not applied for, and the items reused in the building
as defined in LEED 2009 MRc1.2 if MRc.1.2 is not applied for and
any other building materials salvaged and reused on-site if they
are not included in MRc3 calculations
DeCARD Cardboard recycled off-site
DeDIVERT C&D debris diverted
DeGYPSUM Gypsum-type wallboard recycled off-site
DeLANDFILL All C&D debris excluding hazardous wastes, land-clearing debris,
and soils that are disposed of off-site in a landfill or other waste
facility without recycling or reuse
DeMETAL Metals recycled off-site
DeMISC Miscellaneous items recycled off-site
DePAVEREUSE Existing pavement debris reused on-site
DeRUBBLE Any rubble (bricks, concrete, asphalt, masonry, etc.) recycled off-site
DeWOOD Any wood recycled off-site

The units on these variables can be either volume-based or weight-based, but must
be consistent throughout. There has been very limited research on the conversion
factors needed to bring some volume measurements into weight measurements (or
vice versa). The LEED-NC 2.2 and LEED 2009 Reference Guides specify that either the
solid waste conversion factors listed in the LEED 2.2 or LEED 2009 Reference Guides
Table 2 under MRc2 can be used, or another justifiable set of conversion factors. The
default LEED conversion factors are represented in Table 5.2.1. Typically, these are
assumed to be waste management dumpster volumes. In addition, another set of many
of the conversion factors was developed based on construction debris (no demolition
debris was included in these factors) from a LEED certified project in Columbia, S.C.,
in 2005. These conversion factors were derived from the weights and volumes of the
dumpsters and were referred to as “dumpster densities” in that report. They are also
given in Table 5.2.1 as are other conversion factors found in a compilation of studies on
recycling operations elsewhere, but which were usually from receiving facilities and
not necessarily LEED-related. Table 5.2.1 is taken from L. Haselbach and S. Bruner,
“Determining Construction Debris Recycling Dumpster Densities,” Journal of Green
Building, Summer 2006, 1(3).