Monday, 26 March 2018

DAMP-PROOFING ,Object/Necessity,Causes ,Effects ,Prevention of Dampness and Materials Used For Damp Proofing.

The treatment which is given to the building at the time of their construction to prevent the entry of damp into the building is known as damp-proofing .

Object/Necessity of damp proofing:-

                                                                                     Damp free condition is one of the basic requirements of all the building structures. Dampness makes a building un habitable and structurally unsafe. Thus,the object of providing damp proofing course is to prevent the entry of damp into the building and there by to make the building habitable and structurally safe ,damp proofing is necessary.

Causes of Dampness:-

                                                    The various causes responsible for entry of dampness into a structure are as follows:
1)Rising of ground water table.
2.Entry of rain water through the unprotected external walls,leakage in roof of a building.
3)Deposition of moisture on walls,floors,ceilings due to condensation of air.
4)Entry of rain water through the exposed top of walls.
5)Inadequate drainage of rain water from roof due to its improper slope.
6)Inadequate drainage system of the surrounding areas where the building is situated.
7)Improper orientation of the building.
8)Bad workmanship at the time of construction such as defective rain water pipe connections,defective joints in roof , improper connection of walls etc.


Effects of Dampness:-

                                                   Harmful effects of dampness are as follows:
1)The materials used in the construction of building are seriously affected by dampness.
2)The plaster becomes soltened and may crumble due to dampness .
3)Unpleasant white patches are formed on the damp surface.
4)The appearance of distemper is badly affected by dampness.
5)Timber may decay, warp and buckle due to dampness.
6)The metallic fittings may corrode.
7)The electrical fittings may get damaged.
8)Dampness promotes growth of termites and mosquitoes breeding.
9)Dam building create unhealthy conditions of occupants.


Prevention of Dampness:-There are various methods of damp proofing.Adoption of any specific method depends upon various factors such as nature of surface , location of structure , sub-soil water table, amount of dampness to be handled etc.Following are the methods or measures adopted to prevent dampness:
1)Surface treatment.
2)Integral water proofing.
3)Incorporation of a membrane between the source of dampness and the part of the building adjacent to it .
4)Construction of cavity wall.
5)Guniting.


Materials Used For Damp Proofing:-The following materials are commonly used for damp proofing:
1)Hot bitumen
2)Mastic asphalt
3)Bituminous felts
4)Metal sheets
5)Combination sheets and felts
6)Bricks
7)stones
8)Mortar

9)Cement concrete
10)Plastic sheets.
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