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Dampness in buildings is a significant problem affecting the durability, strength, aesthetics, and health conditions within a structure. It refers to the presence of unwanted moisture in the structure of a building, either through direct ingress of water or condensation of water vapour. If not identified and treated on time, dampness can cause serious structural deterioration and pose health hazards. There are various causes of dampness in buildings, each with specific mechanisms and contributing factors. Understanding these causes is crucial for adopting suitable preventive and remedial measures. One of the major causes of dampness in buildings is rain penetration. Rainwater is the most common external source of moisture and enters the building primarily through roofs, walls, joints, and openings. If the external walls and roofs are not adequately designed or maintained, water can seep through cracks, porous masonry, faulty junctions, and inadequate roof slopes. Rainwater penetration often becomes severe during storms or prolonged exposure to heavy rainfall, particularly in areas with poor surface drainage or without proper weatherproofing treatments. Another major cause is capillary rise of moisture from the ground. This occurs when water from the soil below the building rises through the pores of building materials like bricks, stones, and concrete due to capillary action. This is particularly problematic in buildings that lack an effective damp-proof course (DPC) or where the DPC has failed. The moisture can travel up to several feet above the ground level, making internal walls, floors, and lower stories susceptible to dampness. This kind of rising dampness is common in old buildings and in structures built in areas with a high water table. Leakage from plumbing installations and faulty drainage systems is another frequent source of dampness. Internal _____ ________ _____ ________ ____ ____ ____ _____ ______ ____.
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