Water can enter basements through liquid water or water vapor. Liquid water can seep through cracks in foundations if drainage is inadequate or the water table is too high, exerting pressure. Water vapor also travels easily through porous concrete. Dampproofing with asphalt is applied to slow down water vapor transmission, but waterproofing methods like spray coatings or plastic sheeting with dimples are better barriers. Proper drainage around the perimeter, like using perforated PVC pipe, is also essential for keeping water away from foundations. For buildings already experiencing leaks, ensuring proper drainage, slopes, sealing seepage holes, and waterproofing repairs may help, and polyurethane grouting is an effective

1. Basement how to stop water entry

2. Ways of water entering in a building
Water can enter your basement two ways: as liquid water or
as a gas, called water vapor. Both are important and can
cause a variety of problems if ignored by builders.
Water vapor. there is a lot of water vapor in the soil, In fact the
relative humidity of the soil is 100%. water vapor travels
easily though concrete
Liquid water. Where foundation drainage is inadequate or the
water table too high, liquid water can build up around the
foundation and exert hydrostatic pressure, forcing itself
through any small opening and into the concrete itself.

3. characteristic of concrete
Concrete may be hard as rock and unaffected by
moisture, but it readily absorbs liquid water through
porous hole like membrane
Damproofing
The thin layer of asphalt applied to most foundations is
called “dampproofing”. The purpose of dampproofing is
to slow down the transmission of water vapor through
the concrete walls into the building If you backfill with a
well-drained, granular material next to the foundation
wall, then dampproofing will do a reasonably good job
of keeping water vapor from entering porous to water
vapor.

4. Damper proofing with asphalt

5. Waterproofing
most start with a heavy spray-on elastomeric coating that can bridge
cracks and keep out water
Dimpled membranes: These are plastic sheets with the dimples facing
into the wall, creating about a ½ inch gap for drainage Widely
available Air-Gap Waterproofing Membrane, It’s important to select
a product with adequate compressive strength
Matrix panels: These form the air gap by using a tangle of thick plastic
fibers. The best available with filter fabric on one or both sides and
uses 40% to 50% post recycled material.

6. Footing Drains
Drains around the foundation perimeter should be an
essential part of every basement waterproofing system.
The best product to use for footing drainages rigid PVC
drain pipe with small holes drilled in two or three
rows. prefer Schedule 40 pipe – the same thing used for
plumbing drains Remember, the holes face downward
when installed! That way, rising water flows into the pipe
and away from the footings.

7. Foundation Drainage

8. Water leak arresting for building in operation
If the following are not done properly the following options to be
tried
proper drainage to be done
Slope to be given to get the water out of the building
any seepage holes found visible to be arrested
water proofing plastering to be done once again
if nothing works out PU grouting is the only option to be followed
Go through the comments shared by Mr.Steven Bliss,
BuildingAdvisor.com

9. PU GROUTING FUNDAMENTALS
Grouting with polyurethane [PU] resins represents an
effective method of improvement of mechanical and
sealing properties of soil and rock environment and
constructions. The principle of grouting technologies is
injection of liquid grouting material into the rock
environment or construction under pressure. During the
grouting process, fissures and pores are filled with the
grouting material, which subsequently hardens and
connects the disintegrated parts of the rock mass or
grains of loose material.

10. PU usages in civil construction
strengthening of subsoil (also under groundwater level)
securing of stability of structures threatened by mining construction
works
strengthening of brick or stone masonry
restoration of insulation of structures
sealing of utility entries into constructions
sealing of joints
stopping of water inflows into constructions and etc.

11. PU Grouting machine

12. PU grouting resin types
PU grouting materials can be divided according to their
chemistry to three main groups:
two-component (PU) organic resins:
component A – polyol in mixture (polyetherpolyol, catalysts,
additives),
component B – isocyanates in mixture (methylene diphenyl
diisocyanate [MDI], homologes,
isomeres).
After curing they form solid PU resins or foam.

13. Grouting technology
Mixing of the PU mixture is made in mixing chamber, which is located
behind the pump of the grouting resin from separate tanks or the
components flow in gravitationally.
pump takes the components in appropriate ratio and delivers them
separately to the mixing chamber.
In the mixing chamber, components are mixed and subsequently injected
through the packer into the rock mass. The resin penetrates under the
pressure into surrounding fissures and cavities up to the distance of a
few meters from the borehole. As a result sealing and strengthening of
the rock mass or construction is achieved.

14. Thank you