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.
brickwalls, such as better quality, higher buildability and better durability. Hence, the use of precast concrete walls is strongly recommended for external wall construction. 2.3. EXTERNAL PRECAST WALLS Precast joints are the weakest links in ensuring watertightness of the external precast concrete walls.
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