Dampness in building, causes of dampness and effect of dampness.


Dampness

Dampness is the presence of gravitational moisture into the walls, flooring of roofs, one of the basic provision of the building is that should remain dry free from moisture travelling through building parts like a wall.

Dampness is to reduce the strength of building components.

Dampness prevention is the most part of building or structure design,

Every building should be a damp proofing course.

Provision of damp proofing course is to prevent the entry of moisture into the building structure.

Causes of dampness in building

1. Moisture rising up the walls from ground
2. Rains travel from walls tops.
3. Rain beating against external walls.
4. Condensation
5. Miscellaneous causes.

Moisture rising up the walls from ground

The building is constructed in soil. The substructure is into the ground some depth if the soil is previous, moisture constantly travels through if for impervious soil lots of soil present. The moisture is rise through the wall from substructure to superstructure through capillary action. Rise of groundwater is also the reason for moisture rise into the building through wall and floor.

Rains travel from walls tops.

If the wall top is not properly protected with waterproofing course then the water is entering into the wall from the top of the wall go down. Also, the leakage of the roof is the causes of dampness in a building.

Rain beating against external walls.

During the heavy rainfalls sometimes rains beating against the external face of walls and the walls are not properly treated. Then water is entering into the wall this will cause dampness of interior of the building structure. If the balconies do not have sufficient outward slop then the water is entering the walls from walls junction and it will cause the dampness in a building.

Condensation

Due to condensation of atmospheric moisture, water is deposited on the walls, floor and roof, this will cause dampness in a building.

Miscellaneous causes.

Improper drainage

Improper drainage at the building site may cause dampness. Because deposit of water around the building the water is rise into the walls and floors through the capillary action.

Insufficient roof slope.

 For flat roof should be provided sufficient slope for the drain of rainwater. Otherwise, the rainwater is entering into the roof that will cause dampness.

Rainwater pipes leakage 

Rainwater pipes leakage from defective rainwater drainage pipe may cause dampness in walls.

Imperfect orientation 

Imperfect orientation if the wall does not get proper sunlight and heavy shower may remain damp.

Effect of dampness

1. Travel of moisture through walls and ceiling may cause unlikely patches.

2. Moisture travel may cause suffering and crumble of plaster.

3. The continuous presence of moisture in the walls may cause efflorescence resulting in disintegration of bricks stones tiles etc. and consequent reduction in strength stones tiles etc, and consequent reduction in strength.

4. Moisture cause rusting or corrosion of metal fitting attached with walls, roofs and floorings.

5. Dampness promotes and accelerates the growth of termites.

6. Electrical fittings get worsen gives rise to leakage of electricity and consequent damage of short circuit.

7. The wall decoration is damaged. this is costly to recover.

8. Dampness creates unhealthy living conditions.

9. Floor coverage damaged on the damp floor are cannot use a floor covering

10. The flooring may lessen due to dampness. Because of dampness reduction the adhesion.

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