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Controlling the Dampness in Building
Horizontal DPC
Generally the bricks used in foundation of walls absorb moisture by capillary action. This is the most serious problem and can be checked fully by laying a layer of 40mm to 75mm thick rich cement concrete followed with two coats of bitumen @ 1.65 Kg. per sq. mt. laid hot and sanded at floor level in case of interior walls and 225 mm above ground level in case of outer walls as shown in figure To prevent the entry of moisture from soil under the floors.
Vertical DPC
The inside of the external walls should be provided with vertical damp-proof course consisting of 20 mm thick (1:3) cement plaster with coarse sand covered with two coats of hot bitumen 85/25 extending from horizontal damp proof level to floor level. In no case the level of floor go beyond the level of Vertical DPC, it will cause DPC failure. To make the good bond of subsequent brick layer the bitumen laid should be followed by spraying of hot sand to make it rough and bondable to mortar to be laid for laying brick layer.
Wall Showing the Location of Horizontal and Vertical Damp Proof Course (DPC)
Various types of membranes are available in the market to act as barrier between dampness and outer shell of the structure to safe the costly finishing and healthy environment in side the building.
Now as days various type of water proofing compounds are also available in the market their application should as the directions of the manufactures just to name few are given below.
Epoxy base water proofing compounds
Acrylic Polymer Based water proofing compounds
SBR Based water proofing compounds
Fibers Based water proofing compounds
Melamine Based water proofing compounds
Naphthalene Based water proofing compounds
Lingosulphate Based water proofing compounds
Water proofing compounds with undisclosed Base
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