Damp-proof course (d.p.c.)

DAMP-PROOF COURSE (D.P.C.)

Damp-Proof Course (D.P.C.) is provided to prevent the entry of dampness or moisture from the floors, walls and basement of the building into the building. Therefore, the building is kept dry, safe and habitable (livable).

1. CAUSES OF DAMPNESS

1. Entry of Rain Water: Entry of moisture may be caused due to leakage of rain water through the roof or through the exposed tops of parapet walls and compound walls.

2. Defective Roofs: Defective construction joints in the roof will cause dampness.

3. Entry of Moisture from the Soil: Building materials used in the foundation may absorb moisture from the pervious soil by capillary action. This will cause dampness to the floor and walls.

4. Atmospheric Moisture: Deposition of atmospheric moisture on walls, floors or ceilings also causes dampness.

5. Defective Drainage System: Defective drainage system is also another reason for dampness.

2. EFFECT OF DAMPNESS

1. Corrosion: Dampness leads to corrosion of steel reinforcement rods in the concrete.

2. Electrical Fittings: Dampness causes damage of electrical fittings.

3. Growth of Termites: Dampness may cause acceleration of growth of termites.

4. Patches: Dampness causes formation of patches on the surfaces of floors, walls and ceilings.

5. Health Problems: A damp building causes unhealthy conditions for the occupants.

3. DAMP PROOF MATERIALS

D.P.C.  materials are Mastic Asphalt, Hot Bitumen, Flexible Metal Sheets made of Aluminium, Lead or Copper.

4. PROPERTIES OF D.P.C. MATERIALS

These materials are impervious and flexible. They are durable and remain effective during the life of the building. Also, they safely resist the load coming on them.