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Dampness in buildings is a common defect that leads to deterioration of materials, reduction in structural strength, unsanitary conditions, and discomfort to occupants. Preventing dampness should be primarily addressed at the planning and design stage because proper foresight reduces future maintenance problems and extends the life of the structure. One of the most important preventive measures is proper selection of the site. Low-lying areas, waterlogged soils, and sites with poor natural drainage should be avoided or treated with adequate drainage systems. The ground level of the building _________ _______ _____ ________ ________ __________ ___ _____ _______.
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