Category: Dampness and Its Prevention

Dampness in a building is the presence of moisture in various parts of building like floor, wall, roof etc. The continuous dampness of building give rise to unhygenic condition, hence care should be taken to prevent such situation. In this chapter causes and effects of dampness are presented. Ideal materials required for prevention of dampness are discussed and various methods of preventing dampness are presented.

Category: Dampness and Its Prevention Methods of Damp Proofing

Various methods of damp proofing are as given below: 1. Providing D.P.C. course 2. Providing cavity walls 3. Surface treatment 4. Integral treatment 5. Guniting and 6. Pressure grouting. 1. Providing damp proof course: It consists of providing a damp proof course between the source of dampness and building component. The DPC may be with any water repellant material like

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Category: Dampness and Its Prevention Materials for Damp Proofing

The materials used for damp proofing are: 1. Bitumen: In hot condition it is highly flexible and can be applied with brush to the bedding of concrete or mortar. Thickness of coat provided is about 3 mm. 2. Mastic asphalt: It is a semirigid material. It is obtained by heating asphalt with sand and mineral fillers. It is perfectly impervious.

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Category: Dampness and Its Prevention Requirements of an Ideal Material for Damp Proofing

The requirements of an ideal materials for damp proofing are: 1. It should be impervious. 2. It should be flexible. 3. It should be easy to carry out leak proofing joints. 4. It should be stable. 5. It should be durable. It’s life should be as much as the life of building itself. 6. It should resist the load safely.

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Category: Dampness and Its Prevention Ill-Effects of Dampness

Ill-effects of dampness are as listed below: 1. Patches develop and destroy the appearance of the building. 2. Colour wash, white wash and paintings are damaged. 3. Plaster crumbles. 4. Bricks and stones disintegrate endangering the building. 5. Steel in the slabs and beam start rusting. It reduces the life of structure. 6. Electric short circuits may takes place. 7.

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Category: Dampness and Its Prevention Causes of Dampness

Dampness may be caused by: (a) Ground water (b) Rain water and (c) Leakages from pipes. (a) Dampness due to Ground Water: All buildings are founded on soils. Soil holds water for a long time. Sometimes water level may rise and come in contact with foundation. Due to capillary action moisture from ground rises into foundation, floor and even in

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