1. DPC above ground level – For DPC above ground level with wall thickness generally not exceeding 40 cm, any one of the types of materials mentioned above may be used. Cement concrete is however, commonly adopted material for DPC at plinth level, 38 to 50mm thick layer of cement concrete M15 (1:2:4 mix) serves the purpose under normal conditions.

What is a damp proof course?

Figures 1 to 7 explain the provision of damp proof course under different conditions – Figure 2: Air Drain Fig 3: Damp Proof Course Treatment for basement on undrained soils Fig 4: Plan of building showing DPC Fig 5: Damp Proof Course Treatment for Basement in Damp Soil Fig 6: Asphalt tanking for basement Fig 7: Damp Proof Course for Flooring Fig 8: Damp Proof Course for Internal Walls 1. What is Damp Proof Course? The damp proof course (DPC) is generally applied at basement levels, which restricts the movement of moisture through walls and floors.2. What is the abbreviation of DPC in Construction? The abbreviation of DPC is the Damp Proof Course.3.

What are the desirable properties of DPC Material? The desirable properties of DPC material are- A. It should be impervious.B. It should be strong and durable and should be capable of withstanding both dead as well as live loads without damage.C. It should be dimensionally stable.D. It should be free from deliquescent salts like sulfates, chlorides, and nitrates.4.

What are the types of DPC Materials? A. Flexible Materials : Materials like bitumen felts (which may be hessian based or fiber/glass fiber-based), plastic sheeting (polythene sheets), etc.B. Semi-rigid Materials : Materials like mastic, asphalt, or a combination of materials or layers.C.

What is the best damp proofing material?

1. Membrane damp proofing: – In membrane damp proofing, a water repellent membrane is inserted between the source of dampness and the part of the building adjacent to it. Damp proofing material may be like bitumen, mastic asphalt, polythene sheets, bituminous felt, metal sheets, cement concrete, etc.

• The surface on which DPC is Don should be free from harmful ingredients and be labeled and also free from projections so that the DPC is not damaged
• At junction and corners of the walls, the DPC course should be is in as an integral part in the horizontal direction and should be laid continuous.
• When a horizontal DPC (i.e., that of a floor ) is continued to a vertical face, a cement concrete fillet of a 7.5-centimeter radius should be provided at the junction.
• The DPC course should not be exposed to the other side on the wall surface otherwise it will get damaged during finishing work and inspection work.
• The full thickness of the wall should be covered by a damp proofing course, excluding rendering.

Which type of bricks are used as damp proof course?

2) Rigid Materials: –

The materials, which do not resist transverse stresses and cracks when subjected to sever loading, are known as Rigid Materials.

a) Rich Concrete

1.2cm (0.47″) to 4cm (1.57″) thick layer of “Rich Concrete” (1:2:4) painted with two coats of hot bitumen is used as horizontal D.P.C. It also prevents the moisture penetration by capillary action. These layers are laid where the damp is not excessive.

b) Mortar:

2cm (0.79″) thick layer of “Rich Cement” and “Sand Mortar” (1:3) is applied on the inner face of external wall. This is a vertical D.P.C. The surface is than painted with two coats of hot bitumen.

c) Bricks:

Over burnt or dense bricks in one or two layers can be used as cheap and effective Damp Proof Course. They are laid in “Rich Cement” and “Sand Mortar” (1:3). Bricks are rarely used as DPC except in cheap houses.

d) Stones or Slates:

Two layers of stone slabs or slates laid in Lime, Cement and Sand Mortar (1:1:6) make a good DPC. They can also be laid in “Cement Sand Mortar.” It is used where a good quality of stone is easily and cheaply available.

What is the best concrete mix for damp and humid conditions?

1. DPC above ground level – For DPC above ground level with wall thickness generally not exceeding 40 cm, any one of the types of materials mentioned above may be used. Cement concrete is however, commonly adopted material for DPC at plinth level, 38 to 50mm thick layer of cement concrete M15 (1:2:4 mix) serves the purpose under normal conditions.