The UK climate is changing. Increasing levels of atmospheric C02 and other greenhouse gases are leading to annual increases in global temperatures. Forecasts for the UK anticipate temperatures to rise by 2.0-3.5 deg C by the year 2080. Increased levels of rainfall are leading to wetter winters resulting in higher water table levels than previously recorded. Higher levels of ground water will force designers and contractors to further consider the impact of lateral water pressure upon below ground structures for both new and existing buildings. The following article will consider the relevant legislation, problems and failures associated with current methods of resisting below ground water, particularly in light of the present increases in ground water levels. Consequently, the report will look at examples of correct system design and how manufacturers can help to eliminate risks associated with below ground tanking. Guidance on the protection of buildings from ground water ingress is initially provided by Approved Document C (Site Preparation & Resistance to Moisture), 2000. Besides establishing the minimum waterproofing requirements for different structural elements, Part C refers users to BS 8102: 1990 Code of Practice for the "Protection of Structures against Water from the Ground". The standard addresses the different kinds of below ground waterproofing whilst also grading the different levels attainable (Grades 1 to 4; Grade 4 being a Totally Dry Environment or Archive Status).
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