Guideline for laying DPC

One of the essential requirements of building is that its interior should remain dry. A damp building is unhealthy and causes damage to the structure. There are many causes of dampness in the building such as due to defective design, substandard building material, improper execution and rise of dampness from foundation.  So it is most important and necessary to provide Damp Proof course (DPC) in the building at the time of construction.

As the foundation of all the buildings are embedded in the soil. As bricks being porous and which are generally used in foundation below ground level can absorb moisture from adjacent ground or soil. The moisture travels up from one course to another by capillary action and can make the wall damp for a considerable height. Rise in ground water table in the rainy season may aid the entry of moisture in to the wall and in the floor.

To prevent water absorbed from the soil rising and causing dampness in the wall and adjacent wood work and plaster, a continuous layer of an impervious material is provided. This layer is known as horizontal damp-proof course (DPC). The damp-proof course should be laid at plinth level i.e. at floor level in all building except temporary structures. The plinth level of the building should 45cm above the ground. On the outer walls the DPC is laid at the ground level, to save wall from dampness of floor, vertical DPC is laid on the outer walls on internal surface from ground to plinth level.

The thickness of horizontal DPC for boundary wall is 25mm and for building is 40mm or 50mm. The DPC is consists of cement concrete 1;2;4 i.e. 1 is cement, 2iscoarse sand and 4 is stone aggregate or BAZRI. The DPC should in full width of wall and should not be set back from the face of wall for pointing. It must be continuous for the whole length of the building. There should be no any construction joints in the damp-proof course. The DPC is not carried across doorways and openings.

DPC laying guide line

  • Before laying the DPC the surface of brick or stone masonry should be in level.
  • See that the edge of DPC should be straight, even and vertical.
  • The side shuttering should consist of steel form.
  • Ensure that the side shuttering is strong enough so that does not get disturbed while laying and compacting the concrete mix.
  • The side shuttering should be tight so that mortar/ concrete mix should not leak from the side.
  • The cement concrete mix ratio should be 1;2;4 and see that all the gradients such as cement, fine aggregate, coarse aggregate and water should be according to specification.
  • The cement concrete mix should be of workable consistency and should be tamped thoroughly to make a dense mass.
  • See that the side surface should be smooth without honeycombing.
  • The DPC should be cure for 7 days after which it should be allowed to dry for at least one day before application of bitumen.
  • Before application of bitumen, the dried surface of DPC is cleaned with brushes and finally with a piece of cloth soaked in kerosene oil before application of hot bitumen.

Apply the hot bitumen in two coats uniformly at the rate of 1.7 kg per square meter all over, so that no blank spaces are left anywhere on the DPC.

Dampness causes most of the damage to the contents of the building. It often leads to the growth of molds and bacteria and creates an unhealthy environment for those who occupy it. Dampness gradually impairs the affected part of the building so this problem should be attended as soon as possible.
Brick and masonry absorb water so they must be sealed off, away from moisture and moisture-bearing substances like soil. If it does not occur, the water will rise in the walls causing dampness.
Cement plaster 1:3 with two coats of hot bitumene when laid @ 1.7 kg per sqr meter or cement plaster 1:3 with bitumen
The foundation of all structures are embedded into the soil. Bricks being porous or brick masonry below ground level can absorb moisture from adjacent ground.
For residential buildings DPC consists of a layer of - 40 mm thick cement concrete 1:2:4 (1 cement: 2 Coarse sand: 4 graded stone aggregate 12.5 mm nominal size ).
For residential buildings DPC consists of a layer of-
The following table expresses the type of coating recommended for the protection of Dampness:
The density of masonry bricks used must be greater than 1200 kg/m³.
REPLASTERING: The most common method is to scale the affected damp plaster back to the brickwork and replaster the affected area with a waterproof plaster or cement mixture.
The water proofing membrane is laid out on top of the existing floor surface. It will act as a barrier against dampness.
.Dampness in buildings is a concern because it often leads to the growth of molds and bacteria
The following brands of chemical are used for the protection of dampness from building:
A damp building is unhealthy to those who occupy it, dampness in building is a concern because it often leads to the growth of molds and bacteria.
The following method should be adopted for the protection of dampness in floor:
Horizontal DPC :- All the brick walls should be covered with the horizontal DPC at the floor level.
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