Types of Floor Lecture Notes

Dampness in buildings and DPC

Definition:

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

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

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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