Damp Proof Course

DAMP PROOFING
CONCRETE
By K.Shah
B.E.(Civil Engg) NIT Rourkela,India
M.Sc. (Environment), University of Leeds, UK
Ex-GM(Civil & Environment) – MNC
Currently Guest faculty-College of Technology & Engineering

CUASES OF DAMPNESS
Definition
“Dampness is the presence of hygroscopic
or gravitational moisture”
 Building should remain dry or free from moisture
travelling through waals, roofs and floors.
 Dampness gives un hygienic conditions apart from
reduction in strength of structural components.
 Provision of damp proof courses prevent entry of
moisture in the building.

(1) Moisture rising up the walls from ground.
a) All structures are founded on soils
b) If the soil is pervious, moisture constantly travels
through it.
c) Even in the impervious soil, lot of soil moisture may be
present.
d) This moisture rise up into wall & floor through capillary
action.
e) Ground water rise also result in moisture entry into the
building through walls.

(2) rain travel trough wall tops:
If the wall tops are not properly protected
from rain penetration, rain will enter the
wall & will travel down.
Leaking roofs will also permit water to
enter.

(3) Rain beating against external walls :
 Heavy showers of rain may beat against the external
faces of walls & if the walls are not properly treated,
moisture will enter the wall causing dampness in the
interior.
 If balconies and chajja projections do not have proper
slope, water will accumulate on these & will enter the
walls through their junctions.
 Moisture will completely damage interior paints of walls.

(4) Condensation
 Due to condensation of atmospheric moisture, water is
deposited on the walls, floors & ceilings.
 This moisture causes dampness.

EFFECTS OF DAMPNESS
Following are ill effects of entry of
dampness:
1. Dampness gives rise to breeding of mosquitoes &
create unhealthy conditions.
2. Travel of moisture on wall causes unsighty patches.
3. It may cause softening & crumling of plasters.
4. Wall decoration or paint is damaged.
5. Continuous presence of moisture in wall may cause
florescence which result in disintegration of bricks,
stones,tiles

EFFECTS OF DAMPNESS
6. Flooring gets loosened due to reduction in adhesion
when moisture enters through the floor.
7. Timber fittings such as doors, windows almira etc
coming in contact with damp walls, damp floors get
deteriorated because of warping etc.
8. Electrical fittings get deteriorated, giving rise to
leakage of electricity & danger of short shirtings.
9. Floor coverings are damaged.
10. Dampness promotes & accelerated growth of termites.
11. Dampness breeds germs of disease like tuberculosis,
neuralgia, rheumatism.
12. Moisture causes rusting & corrosion of metal fittings.

METHODS OF DAMP PROOFING
(1) use of damp proofing course (DPC) :
Membrane damp proofing.
(2) Integral Damp Proofing
(3) Surface Treatment
(4) Cavity wall construction
(5) Guniting
(6) Pressure Guniting

(1) Membrane Damp Proofing (Use of
DPC)
(1) Membrane Damp Proofing (Use of
DPC)
 In this method water repellent membrane or damp proof
course (DPC) between the source of dampness and
part of building adjacent to it.
 DPC may be bitumen, mastic asphalt, bituminous felts,
plastic sheet, metal sheets, cement concrete
 DPC may be provided horizontally or vertically in floors,
walls etc.

(1 ) Membrane Damp Proofing (Use of DPC)
Following general principles should be applied while
providing DPC:
a) DPC should cover full thickness of wall.
b) Mortar bed supporting DPC should be levelled & even and should
be free from projections, so that DPC is not damaged.
c) At junctions & corners of walls, the horizontal DPC (on floor)
should be laid continuous.
d) When a horizontal DPC is continued to vertical face, a cement
concrete fillet of 7.5 cm radius should be provided at junction.
e) DPC should not be kept exposed on wall surface otherwise it may
get damaged during finishing.

(2) INTEGRAL DAMP PROOFING
This consists of adding certain water proofing compounds of
materials to the concrete mix, so that it becomes impermeable
These water proofing compounds may be in three forms:
1. Compounds made from chalk, talk,fullers earth, which may fill the
voids of concrete under the mechanical action principle
2. Compounds like alkaline silicates, aluminium sulphate, calcium
chlorides etc which reacts chemically with concrete to produce
water proof concrete.
3. Compounds work on water repulsion principle. like soap,
petroleum, oils fatty acid compounds such as Stearates of calcium,
sodium, ammonia etc. When they are mixed with concrete
becomes water pepellant.
4. Commercially available compounds like Publo, Permo, Silka etc.

(3) SURFACE TREATMENT
 The surface treatment consists of application of layer of
water repellant substances on the surface through which
moisture enters.
 The use of water repellant metallic soaps such as
Calcium & Aluminium Oletes and Stearates are effective
against rain water penetration.
 Pointing & plastering of the exposed surfaces must be
done carefully using water proofing agents like Sodium
or Potassium silicates, Aluminium or Zinc sulphates,
Barrium hydroxide and magnassium sulphate.
 Surface treatment is successful when moisture is
superficial.

(4) Cavity Wall Construction
• In this method of damp prevention in
which main wall of building is sheilded by
an outer skin wall, leaving a cavity
between the two.

(5) Guniting
This consists of depositing layer of rich
cement mortar by pressure to the exposed
surface of wall, pipes.
Cement mortar is 1:3 cement sand mix.
Mortar is shot on clean surface with
cement gun under 2 to 3 kg/cm2 pressure.
Nozzle of machine is kept at a distance
about 75 to 90 cm from wall.
Curing of mortar is done for 10 days.

(6) Pressure Grouting
In this method, cement grout is filled in
cracks, voids in the structure of building by
pressure.
Foundation of building are subjected to
grouting to make water-penetration-
resistant.
This method is effective to control entry of
ground water through foundations

MATERIALS FOR DPC
• Ideal DPC should have following quality:
• Should be perfectly impervious
• Should not permit moisture penetration
• Material should be durable with life equal to
building life.
• Material should be strong to resist superimposed
load/ pressure.
• Material should be flexible to accommodate the
structural movements without any craks.
• Material should not be costly.
• Material should remain steady in its position.

MATERIALS FOR DPC
(1) Hot bitumen:
This is highly flexible.
Can be applied with a minimum thickness
of 3 mm.
It is placed on bedding of concrete in hot
condition

MATERIALS FOR DPC
(2) Mastic Asphalt
It is made by mixing bitumen & sand &
mineral fillers
It is semi rigid material.
It is squeezed out in hot climate or under
pressure.

MATERIALS FOR DPC
(3) Bituminous Asphalt:
 It is ready made roll of dry asphalt sheets
 It is laid on levelled flat layer of cement mortar.
 An overlap 10 cm provided at joints.
 The laps is sealed with bitumen.
 It can not resist heavy load.
 It can accommodate slight movement.

MATERIALS FOR DPC
(4)
Metal Sheets
 Sheets of lead,copper,aluminium is used as DPC.
 Lead sheet is more flexible.
 Thickness of sheet should be such that its weight is not
kless than 20 kg/m2.
 They are laid similar to bitumnous felts.
 Lead sheet is completely impervious, resistant to
atmospheric corrosion, can take complex shaperesistant
to sliding action.

MATERIALS FOR DPC
(4)
Metal Sheets
 Lead will have corrosion if comes in contact with
cement/lime. It is covered by bitumen.
 Copper Sheets of 3 mm thickness are embeded in
cement /lime mortar.
 It has high resistance to dampness, sliding and pressure.
 Aluminium sheets is also used for DPC but not better
than copper & lead.

MATERIALS FOR DPC
(5) Combination of sheets & bituminous felts
 Lead foils sandwiched between asphaltic or bitumious
felts cabn be used as DPC.
 The combination known as Lead Core can be laid easily,
is durable, efficient,economic & resistant to cracks.

MATERIALS FOR DPC
(6) Bricks
 Special bricks, having water absorption not less
than 4.5 % of their weight can be used as DPC
where dampness is excessive.
 Bricks are laid in 2 to 4 courses in cement
mortar.
 The joints of bricks are kept open.

MATERIALS FOR DPC
(7) Stones
 Dense & sound stones, such as granite,
trap,slates etc are laid in cement mortar 1:3 in
two layer to form effective DPC.
 Stone should be extended to full width of wall.

MATERIALS FOR DPC
(8) Mortar
 Cement mortar 1:3 is used as bedding layer for housing
other DPC.
 Small quantity of lime may be added to increase
workability of mortar.
 In water used for mixing, 75 gm soap is dissolved per
liter of water.
 This Mortar can be used for plaster of outer walls

MATERIALS FOR DPC
(9) Cement Concrete
 Concrete 1:2:4 mix or 1:11/2:3 mix is provided at
plinth level to work as DPC.
 The thickness may vary from 4 cm to 15 cm.
 This layer prevent water rise in wall by capillary
action.
 Where dampness is more two layer can be
made.

MATERIALS FOR DPC
(10) Plastic sheets
This is new type of DPC material made of
black polythene sheet of 0.5 mm to 1 mm
thickness.
Available in 30 m length in market.
The treatment is cheaper but not
permanent.

DPC Treatment in Buildings
(1) Treatment to foundations against gravitational water :
 Foundation may receive water percolating from adjacent ground
and this moisture may rise in walls.
 This can be checked by providing air drain parallel to the external
wall.
 The width of air drain may be about 20 to 30 cm.
 The outer wall of the drain is kept above ground to check the entry
of surface water.
 RCC cover is provided
 Openings with gratings are provided at regular interval for
passage of air.
 Usual DPC are also provided horizontally and vertically.

DPC Treatment in Buildings
(2) Treatment to basements
When basement in dump soils are constructed,
following methods are followed:
a) Provision of foundation drains and DPC.
b) Provision of RCC raft & slab.
c) Asphalt tanking

a) Provision of foundation drains and DPC.
 When basement rests on soils which are not properly drained,
(such as peat soil ) great hydrostatic pressure is exerted and the
floor as well as wall receive water continuously oozing out.
 In such case it is necessary to make a trench all around upto
foundation level & fill it with gravel, coke,
 Open jointed drains may be provided to collect the underground
water.
 Drainage pipes,embeded in gravel bed, may also be provided
before foundation concrete.
 Horizontal & vertical DPC are provided in wall as well as
foundation concrete.
 Drain may have suitable longitudnal slope,ultimately draining
water into catch drain.
 Drain pipes under basement slab may be provided at some
interval.

b) Provision of RCC raft

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