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Dampness, DPC and Damp Proof Methods in buildings by Damp course

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Dampness in buildings and DPC


The access and penetration of moisture content into building through its walls, floor, roof etc. is called dampness.

Effects of dampness in buildings:

  1. Causes rotting of wood.

  2. Causes corrosion of metallic fixtures.

  3. Deteriorate electric installations.

  4. Deteriorate carpet & furniture’s.

  5. Causes spots on the floors and walls.

  6. Causes petting off and removal of plaster.

  7. Causes bleaching and blistering of paints.

  8. Causes effloresce.

  9. Dangerous for the health of occupants.

  10. Reduce the life of structures

Causes of dampness in buildings

  1. Rain penetration

  2. Level of site

  3. Drain ability of soil

  4. climate condition

  5. Defective orientation of building

  6. Moisture entrapped during construction

  7. Defective construction e.g. joints

Method of preventing dampness

  1. By providing DPC ( Damp proof course )

  2. By surface treatment i.e. by providing damp proof paint

  3. By integral water proofing method

  4. By special devices i.e. by providing chajjas & by providing cavity walls etc


This is provided in internal side of roofs

  • For decoration

  • For preventing dampness

DPC ( Damp proof course )

It is continuous layer of impervious material

Dampness in Buildings

Types of DPC

There are two types of DPC

  1. Flexible DPC : It is DPC when load doesn’t crack

e.g. Polythene and Bitumen

Three layers

  1. Bitumen mastic: Bitumen mix with fine sand

  2. Bitumen felt: It is available in the form of rolled sheets

  3. Hard laid bitumen

  4. Metal sheets

e.g. Lead, copper, aluminum is provided with mortar, to avoid rusting.

Rigid DPC: It is DPC when loaded; it cracks e.g. Rich cement concrete 1:2:4

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