Method of Damp Proofing
A continuous layer of damp resisting material provide to protect the super- structure of the building from the effects of dampness is refer as damp proofing course (D.P.C).
It is place in walls, floors or roofs in order to avoid penetration of moisture contents inside the building. The presence of moisture particles in the form of hygroscopic moisture is refer as dampness. It, if not prevent, affects badly the health and comforts of the inhabitants. And seriously deteriorates the stability of the structure. Therefore, D.P.C. is provide at number of places in order to ensure the safety of the building against dampness.
Methods of Damp Proofing
Damp Proofing Course is a continuous layer of an impervious material between the source of dampness and the part of the building adjacent to it. It may consist of flexible material or rigid materials or semi-rigid materials. It may be provide either horizontally or vertically.
Use of D.P.C. ( Damp Proofing Course )
In this, an impervious layer is provide.
Integral damp-proofing
In this certain water proofing compounds of materials are add to the concrete mix. The materials may be from chalk, talc, fuller earth, alkaline silicates, calcium chloride, soap, petroleum, oils, publo, permo etc.
Surface treatment
It consists of applying a layer of water repellent surfaces or compounds e.g. metallic soaps, calcium and aluminium stearates.
Cavity wall construction
In this, main wall is shield by an outer skin wall leaving a cavity which prevents the entry of water.
Pressure grouting
In this, cement grout is force under pressure into cracks, fissures, voids etc.
Guniting
In this an impervious layer of rich cement mortar (1:3) is deposit under pressure. Cement gun is use for this purpose. Curing is done afterwards for about 8 to 10 days.
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