Transcription of 1. Introduction
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1. Introduction
1. IntroductionIn a survey conducted by BCA in year 2003 involvingabout 10,000 private residential units, water seepagethrough external walls was found to be a commondefect faced by homeowners. The survey findings alsoshowed that the use of single layer brickwall is themost common cause of water seepage through externalwalls. Almost 90% of the water seepage occurredthrough cracks in the plastered brickwalls. In general,water seepage through external walls occurred withinthe first five years of building seepage through the external walls isunacceptable to the occupants. The problem is furthercompounded by Singapore s high humidity andabundant rainfall throughout the year. High windspeeds experienced by high-rise buildings alsoincrease the likelihood of water seepage.
There are various external wall systems used in the local industry, including precast concrete walls, cast in-situ reinforced concrete walls, brickwalls, curtain walls, cladding walls, concrete block walls, etc. Due to volume constraint, this publication focuses on precast concrete walls, cast in-situ reinforced concrete walls and plastered ...
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