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Waterproofing

What is Waterproofing?

A treatment on a surface or structure to prevent passage of water under hydrostatic pressure*



 

What is Damp-Proofing?


A treatment on a surface or structure to resist the passage of water in the absence of hydrostatic pressure

 

(to retard - not stop - the absorption of water or water vapor through concrete or masonry)

 


 

Importance of Proper Waterproofing

Structure

 

Ingress of moisture leads to corrosion, expansion, spalling, etc.

Eventually causes failure and collapse

Life of structure drastically reduced

 



AESTHETICS

 

Poor appearance of exteriors and interiors

Woodwork bulges/warps and becomes termite prone

Expensive paint/finishes do not last

Erosion of brickwork, plaster due to efflorescence

 



HEALTH HAZARDS

 

Causes growth of micro bio-organisms like mold, algae, fungus

High humidity and less ventilation conducive to bacterial growth

Expensive paint/finishes do not last

Erosion of brickwork, plaster due to efflorescence

 



Areas Needing Waterproofing in a Building

SUPERSTRUCTURE
Bathrooms, Kitchens, Rooftops, Terraces

ELEVATION
Exposed RCC,
Exterior walls &
Window Gaps

SUBSTRUCTURE
Foundation, Basements,
underground tanks

 



Waterproofing Categories

Waterproofing to different parts of buildings can be categorized as

 


primary waterproofing

 

This type of waterproofing is generally done by providing external physical waterproofing barrier coats in form of Cementitious polymer modified, Bituminous, Acrylic Liquid applied membranes or Preformed membranes.

This category is actually considered as main waterproofing system for any structure by enveloping them in to impervious layers.

Primary Waterproofing Systems

  • Film – forming (Cementitious + Non Cementitious- Acrylics)
  • Pre Formed Membrane
  • Surfacing
  • Joint sealing (Expansion + Construction Joints)
  • Injection Grouting (Polyurethane + Cementitious)

 



Secondary Waterproofing

 

This type of waterproofing is generally done by adding liquid/powder additives to concrete/mortars during making of concrete/mortar or post concreting by either brush or broadcasting impregnating additives mixed with Cementitious powders. These systems generally reduces the porosity of the concrete and make it impervious than controlled concrete mix.

However these systems are not effective on construction joints, honeycombed concrete, cracks in concretes as they do not provide any waterproof barrier over concrete.

Secondary Waterproofing Systems

  • Film – forming (Cementitious + Non Cementitious- Acrylics)
  • Integral WP compounds / Admixtures
  • Impregnation