Material Contingency Waste in Office Construction Projects

Abstract

This study focuses on material contingency wastes in office construction projects due to the fact that they impact on construction costs. Data were collected from three construction sites. They have 2-3 storeys heights, and their values are 44-216 million baht. The study focuses on 6 materials which are rebar, concrete, cement, bricks, tiles, and ceiling sheets. Data collections were done by visiting construction sites and interviewing the related persons. One project manager, two site engineers, one store man, and one site foreman were interviewed in each site. Material contingency wastes were found in this study. They are 1.83% – 14.80%, 5.25% – 9.81%, 2.87% – 9.10%, 3.00% – 10.88%, 0.92% – 24.11%, and 4.68% – 13.95% for rebar, concrete, cement, bricks, tiles, and ceiling sheets, respectively. The major cause of contingency wastes found in this study is in design processes.