Based (3) types of construction waste that frequently

Based on the result in Table 6, it can
be deduced that there are three (3) types of construction waste that frequently
generated at site namely timber, brick & block and concrete, with timber waste
being the most frequently produced on site. The result is consistent with
previous research by Whyte (2008) which described the major components of
construction waste generated are wood, concrete and bricks.

The reason
for highest timber waste could be because of timber is widely used in the
construction industry as formwork. Formwork is used as a temporary support
especially for concreting work and once the building completed this material
will be disposed. Nature of timber that easy to rot also becomes one of the
reasons why the timber is the highest rank in the production of waste. It can
be proofed by Lachimpadi, Pereira, Taha, &
Mokhtar (2012) in their study which stated timber is the largest quantity
of construction waste where timber will be used as a temporary support to all
concreting work especially for projects using traditional method. Besides, the
lifespan of timber for reuse depends on the quality of the product used in
construction site.

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Brick and
block are the second highest waste generated on site. The result is similar
with Ahmad et al. (2014) who also found that brick waste produced
the second highest at construction site. The high production of brick & block
waste could be because a lot of construction work is using brick especially for
wall and cutting the brick to a desired length to form a perfect wall has produced
the waste. Moreover, local unloading methods play an
important part in the generation of brick waste. Once the materials are broken
or damaged, the brick and block could not be used for construction work
anymore. This
is supported by previous study which described the cause of brick waste
generation are cutting and improper unloading (Bossink & Brouwers, 1996; Whyte,

waste placed in the top three of waste generated on site. This appears to be similar
with Lachimpadi et al., (2012) which mentions concrete and aggregate are the
largest waste produced at 60%. The result also similar in those Chochran, Townsend, Reinhart, &
Heck (2007) that shows
the highest composition of waste for residential projects are concrete (52%).  The cause of the generation of concrete waste
as explored by Poon et al., (2004) found that the concrete wastage in
construction is mainly due to the disparity between the quantities of concrete
ordered and that required, mostly in the case of ready mix concrete supply. It
is also due to poor planning by the contractors on the amount of concrete

this research identifies the three types of waste that rarely produced at site
namely steel, sand & aggregates and finishes. According to the ranking
list, steel is ranked as the fourth. This is followed by sand & aggregates as
the fifth and lastly finishes. Yet, this result differs from those Lachimpadi
et al., (2012) which described sand & aggregates are the largest waste
produced and steel took place the third highest in the ranking. The difference
in this research finding could be as the result of the fact that Lachimpadi et
al., (2012) focuses on high-rise buildings but this research has not focus on
any specific type of projects. Hence, the researcher concludes that
construction waste composition strongly depends on the type of projects
investigated. On the other hand, finishes produce the least amount of waste at
1% which is similar to the result of this research. This could be due to the
leftover pieces after construction project has completed (Nagapan et al., 2011).