Page 238 - The Engineering Guide to LEED-New Construction Sustainable Construction for Engineers

LEED Materials and Resour ces 211

Note that the density of the solid source material as given in Table 5.2.1 is always
much greater than the conversion factor. This is so because there are many void spaces
in the dumpsters and hauling trucks since the contents are not compacted to the density
of the material. The source material densities may be better used in converting volumes
to weight of reused building reuse items. It is recommended that the Columbia study
value for steel and metal be used for cases where there is only construction debris. It
was noted in that study that recycled metals in the dumpsters for construction-only
phases were rarely very large, dense pieces such as structural steel, but were rather
usually items such as pieces of ductwork, piping, and flashing.
The equations needed to determine if the construction waste management credits in
the construction waste management subcategory are earned are as follows:
DeDIVERT = DeBLDGREUSE + DeCARD + DeGYPSUM + DeMETAL
+ DeMISC + DePAVEREUSE + DeRUBBLE + DeWOOD (5.2.1)

One point for LEED 2009 MRc2 is earned if
DeDIVERT ≥ 0.50(DeLANDFILL + DeDIVERT) (5.2.2)

One additional point for LEED 2009 MRc2 is earned if

DeDIVERT ≥ 0.75(DeLANDFILL + DeDIVERT) (5.2.3)
Figure 5.2.1 shows how one type of material can get recycled and save energy and
transportation costs for many different groups. It is a pile of crushed concrete from the
demolition of a dormitory at the University of South Carolina. It was hauled only a few
miles away to an asphalt plant where it is stockpiled for reuse in many ways.

FIGURE 5.2.1 Stockpile of crushed concrete at the Sloan Construction asphalt plant in Columbia,
S.C., ready for reuse. The concrete comes from the demolition of dormitories at the University
of South Carolina, only a few miles away. (Photograph taken August 2007.)