Construction Industry Development Board Malaysia (CIDB) is responsible for promoting Industrialised Building System (lBS) in Malaysia. IBS which involves industrialised production of building elements or components as well as erection and assembly of these elements into desired building structure through mechanically using as little in-situ construction as possible, is as an alternative to the conventional system. Conventional forrnwork system is somewhat unsustainable as it always associates with low quality and productivity, high risk on workers safety, and excessive reliance on labours. On the other hand, IBS forrnwork system known as its systematic construction procedure, high quality of work, less workers and time needed to complete one cycle of formwork process, which is more sustainable. This study focuses on comparing sustain ability ofIBS formwork system to conventional formwork system. A survey has been conducted by distributing questionnaires and carrying out site survey on the selected construction sites which deal with formwork for both systems. Most of the respondents indicate that IBS formwork is more sustainable compared to conventional formwork due to the increasing number of repetitive used by 76.5%, reducing construction waste by 70%, increasing quality of work, reducing number of manpower by 70.1 % and reducing the environmental effects on site. Based on the data analysed, IBS formwork construction is practising more sustainability aspects of construction compared to conventional formwork
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