Construction

Reasons of dampness

 

The reasons of dampness in the building are following:

 

1. Bitumen /Tar- felt coat on RCC slab is not proper or is done leaving some area and joints.

2. Cement concrete ‘gola’ with junction of wall and slab is not constructed or defective or broken. 

3. Rain water pipe joints are defective and there is leakage even on smaller blockage.

4. Rain water pipe mouth have crack in it.

5. Sometimes rainy water pipe inlet is higher than ‘Khurra level’.

6. Some time there is a gap between the mouth of rainy water pipe and roofing.

7. The tracing at roof does not have required slope.

8. Earth place on RCC slab for making slope is not properly rammed. 

9. Some depression exists on the surface of tile tracing where the water is stagnated.

10. Broken tiles are used.

11. The joints of “Chhaja /Cantilever” are not properly finished with the walls.

12. Drip course not made or broken.

13. Proper sill of windows and ventilator is not constructed.

14. The masonry joints of the walls are week and are not covered with cement plaster or cement pointing.

15. Proper ‘Damp Proof Course’ at the floor level is not made on the walls.

16. Rainy water discharge is not through proper shoe in the pipe.

17. Plinth protection is not made around the building.

18. The joints of Water supply and sewer line have some leakage.

19. Under water tank at roof, no water proofing is done.

20. Gap between the tile tracing and support of water tank is left.

21. Joints of tile tracing are not filled properly with mortar.

22. Cement pointing is defective at the top of tile tracing.

23. There is leakage from the water tank.

24. Proper ball cock is not fitted in the water tank.

25. Over flow pipe is not fitted in the water tank.

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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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Dampness 1
Dampness 1
Dampness 2
Dampness 2
Dampness in Joints
Dampness in Joints
Dampness
Dampness
Dampness
Dampness
Dampness
Dampness
Dampness in Wall
Dampness in Wall
Dampness in Wall
Dampness in Wall
Leakage Problem
Leakage Problem

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