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As wood is a
widely used material in the construction process, wood waste is a prevalent
C&D material. Excess wood is scrapped in the building of structures, and
wood is often recovered from demolition sites.
C&D asphalt and
concrete is often produced when a road paved with either material is dug
up. Concrete can also be recovered from the demolition of buildings and
foundations.
C&D debris in the
form of metal is often scrap steel from buildings, roads, highways, and
bridges. Rebar extracted from waste concrete is often recycled.
Two-thirds of the
residential roofing market is comprised of asphalt shingles, which are
usually used on slanted residential roofs. Both new scrap material from the
construction process and used shingles can be recycled, although the new
material is much preferred, as it is less likely to contain outside agents
(USEPA,
1998).
A great amount of
sheetrock is left unused in the construction process as large sheets are cut
to size and the smaller, cut-off pieces can not be used. In fact, about 10
to 12 percent of the sheetrock sold to builders is scrapped in the
construction process
(Musick, 1992). Sheetrock is also a very common
material recovered in demolition projects, as it is a widely-used material
in both residential and commercial buildings. |
