Abstract:
The objective of this research is to find imperfection of construction drawings and
specifications that send impacts on contractors construction productivity, and to
propose initial suggestion for decreasing such impacts. Data are collected from 40
residential building projects in two categories, which are 15 five-storey apartment
projects and 25 two-storey house projects. All of the construction projects are during
construction phase. Based on the data collected, it was found that impacts from the five
storey construction drawing that decrease productivity are 1) design errors 2) confliction
of construction drawings, and 3) construction drawings errors by draftman. Meanwhile,
the impacts from the two storey construction drawings are 1) confliction of construction
drawings 2) improper design during useful life, and 3) incomplete design. Such impacts
effect productivity, time, and cost of contractor during construction process.