Dampness, DPC and Damp Proof Methods in buildings by Damp course
Types of Floor Lecture Notes
Dampness in buildings and DPC
The access and penetration of moisture content into building through its walls, floor, roof etc. is called dampness.
Causes rotting of wood.
Causes corrosion of metallic fixtures.
Deteriorate electric installations.
Deteriorate carpet & furniture’s.
Causes spots on the floors and walls.
Causes petting off and removal of plaster.
Causes bleaching and blistering of paints.
Dangerous for the health of occupants.
Reduce the life of structures
This is provided in internal side of roofs
DPC ( Damp proof course )
It is continuous layer of impervious material
For internal wall we only provide horizontal DPC ( 175 kg/cm2 standard pressure for bitumen )
Three layers of bitumen is provided
You should provide a mortar layer before DPC
Types of DPC
There are two types of DPC
Flexible DPC : It is DPC when load doesn’t crack
e.g. Polythene and Bitumen
Bitumen mastic: Bitumen mix with fine sand
Bitumen felt: It is available in the form of rolled sheets
Hard laid bitumen
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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