Transcription of 1. Introduction - Building and Construction Authority
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1. Introduction - Building and Construction Authority
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. Buildingenvelopes must, therefore, be adequately designedand constructed to prevent ingress of are various external wall systems used in thelocal industry, including precast concrete walls, castin-situ reinforced concrete walls, brickwalls, curtainwalls, cladding walls, concrete block walls, to volume constraint, this publication focuses onprecast concrete walls, cast in-situ reinforced concret
Elasto-plastic sealants are usually applied such that the depth is half the width for maximum movement accommodation and elastic sealants perform best in thin sections. CP 81:1999 recommends that for joints of more than 12mm width, the sealant depth should be …
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