Most Recommended Waterproofing Materials of Concrete

Although concrete is very durable and strong, it is naturally permeable and is prone to water penetration, which may cause structural damage, mold formation, and erosion with time.

The choice of an appropriate waterproofing material is very important to safeguard concrete structures and increase their durability. It is an extensive guide covering all the best waterproofing agents to use on concrete, their characteristic features and their use as well as the strengths they have over one another.

Crystalline Waterproofing

Innovative technology, Crystalline waterproofing occurs when a chemical reaction inside a concrete occurs to produce insoluble crystals that fill pores, capillaries, and micro-cracks.

Key Benefits:

• Permanent Solution: Becomes a part of concrete structure; it permanently protects the structures against water penetration.
• Self-Healing: The image above shows that as the product enters water, the crystalline formation will reactivate and seal up any new cracks of up to 0.4mm long again and again which provides continual protection.
• Greater Durability: Provides tremendous improvement in water resisting pressure on the concrete, even in elevated pressure of hydrostatic pressure.
• Chemical Resistance: Offers a great deal of protection against mega chemicals such as acids and sulfates.
• Environmentally Sustainable: Non VOCs and it can be used in potable water.

Application Methods:

• It has been used as an admixture when making concrete (normally 1-2 percent cement mass).
• Can be supplied in form of surface mounting as a coating on current structures.
• Best performance of 3.2 to 4.0 kg/m 2 of integral crystalline waterproofing should be used.

Polyurethane Waterproofing

Polyurethane based waterproofing systems are also very elastic and flexible systems that have very wide application basis as they create inert, elastic membranes over the concrete surfaces that are seamless.

Key Benefits:

• Better Flexibility: Resists strain at low temperatures making the material flexible to accommodate structural movements and to avoid cracks.
• Marvelous Bonding: Being highly adhesive, it binds well to concrete surfaces and therefore its waterproofing capacity is free of failure.
  UV and weather resistance Wire: It can tolerate extreme climate conditions and hence it can be recommened in exposed applications.
• Chemical Resistance: Resistant to oils, detergents and several chemicals very well.
  Flexibility: Can be applied in multiple applications such as roofs, terraces, balconies and wet surfaces. Application Methods:
• Directly applied as a liquid membrane that dries to a seam free waterproof membrane.
• Is applicable by spraying or rolling on or brushing on a concrete surface.
• Sometimes will need a primer to stick it well to the substrate. Cementitious Waterproofing
• Cementitious waterproofing is sometimes a cementitious based material that is blended with patented chemicals and additives in order to provide a rigid waterproof membrane.

Application Methods:

• Cost Friendly: Become cheaper in general as compared to other waterproofing systems.
  Easy to use, easy to prepare, it is simple to mix and apply, it requires simple tools and skills.
• Good Adhesion: Has a good adhesion with the surfaces of concrete and masonry.
• Breathability: Able to permit the water vapor to get away and not able to allow the Liquid water to attack it.
• Durability: Gives long term protection when applied and applied well. Application Methods:
• Applied to concrete by use of slurry or mortar.
• Applicable on positive and negative side waterproofing.
• Needs usually two coats to give maximum protection.

Bituminous Waterproofing

Bituminous waterproofing materials are made either of asphalt or coal tar pitch and offer moisture impermeable flexible covering.

Key Benefits:

• Great Flexibility: Resists movement of structures and changes of temperature.
  Cost effective: also tends to be more cost effective than synthetic membrane systems.
• Good Water Resistance: It has an excellent protection against exposure to water.
• Easy to Use: It is applicable either in liquid or in sheet form.
• Durability: Provides long lasting protection when it is being installed properly. Application Methods:
• In the forms of liquid applied coatings or pre-formed membranes.
• The hot-applied systems need to be heated to 350-400 F before use.
• Cold-applied systems can be applied either by brushing or spraying on surfaces. The Semflex brand PVC Waterproofing Membranes are used in the building of new houses, or for renovation and retrofitting of existing houses.

Polyvinyl Chloride (PVC) membranes:

PVC membranes are man made sheet products that give a long lasting flexible watertight system.

Key Benefits:

• Long-Lived: Not easily punctured, torn or damaged by machineries.
• Outstanding mobility: Suitable to movements and weighting of the structure.
• UV Resistance: Can be exposed to extended periods of sun light without serious damage.
• Chemical Resistance: It provides adequate protection against wider use of chemicals and environmental pollutants.
• Repairable- Can be repaired easily in case it would get damaged. Application Methods:
• Fixtures in form of sheets which are heat-welded along the seams to form a continuous sheet.
• As well as in a wide variety of thicknesses (usually 0.5-6.0mm) to suit different purposes.
• May be mechanically fastened, fully adhered or loose-laid with ballast.

Thermoplastic Membranes and TPO (Thermoplastic Membranes)

Thermoplastic Polyolefin (TPO) membranes have all the benefits of rubber and plastic materials and are used as an all-purpose waterproofing tool.

Key Benefits:

• Weather Resistance: Very resistant to UV radiation and weatherisation.
• Flexibility: Has a low temperature flexing ability and provides excellent dimensional stability.
• Heat Weldability: seams may be joined together by heat weld and form monolithic waterproof barrier.
• Environmentally Friendly: it has no plasticizers or chlorine, in contrast to some alternatives, it is therefore environmentally friendlier.
• Energy Efficiency: Light-colored TPO membranes have a high reflection potential to solar radiation thus savings on cooling costs.

Application Methods:

• Installed in form of attached location as sheets mechanically fastented, adhered in full, or ballasted.
• Waterproofing is done by heat-welding of seams to form a continuous membrane.
• It can be used in roofs, basement and tunnels.

Epoxy Waterproofing

Epoxy waterproofing systems form a hard ,strong chemical chemical-resistant impervious layer which adheres well to concrete.

Key Benefits:

• Fantastic Bond: Makes an amazing bond towards concrete, making it water impermeable.
  Chemical Resistance: It is quite resistant to acids, alkalis and oils as well as other chemicals.
• Durability: Offers protection against penetration of water which lasts long.
• Abrasion: able to resist traffic and physical wear.
• Flexibility: Can be applied on different types such as floors, walls, and tanks. Application Methods:
• Used as a two part system which is chemically hardened to form a hard waterproof coating.
• Demands good surface preparation as far as adhesion is concerned.
  Applicable by brush, roller or spray equipment.

EPDM Waterproofing Rubber

Ethylene Propylene Diene Monomer (EPDM) is a rubber membrane which is synthetic and has exceptional flexibility and weather resistance.

Key Benefits:

• Supertough Strength: Withstands pickling and decaying, solar light, and ozone.
• Totally flexible: Remains elastic across a very large range of temperature (-40 C to +80 C).
• Good Elongation: Has the ability to stretch and fit structural movements without getting tear.
• Low maintenance: It needs little maintenance during its life period.
  Environmental Resistance: Resists presence to the several environmental conditions.

Application Methods:

Fitted as large sheets which are glued on or mechanically clamped to the base.
Seams are normally closed by adhesive or tapes systems.
It demands appropriate surface work with a leveler aggregate of cement mixture (20-30mm thickness).

Silicone Sealants

Silicone sealants give soft, non-porous joints and may be applied to seal gaps and cracks in concrete buildings.

Key Benefits:

• High Flexibility: It is elastic throughout a construction period and it receives structural movements.
• UV Resistance: Can be exposed to extended periods of sun light without serious damage.
• Stability in temperature: Remains in good performance even over different temperature ranges.
• Adhesion: it adheres well to concrete and many other building materials.
• Longevity: has a long waterproofing life.

Application Methods:

• Used in the form of a very tacky liquid which dries to leave a flexible and waterproof seal.
• It is mainly used to seal joint, cracks and penetration.
• The surfaces must be clean and dry to afford maximum adhesion. Comparative Analysis
• In choosing the most suitable type of waterproofing material to use in concrete, this should be based on various aspects such as the concrete application involved, exposure conditions and the requirements needed.

Performance Comparison:

Application Suitability:

Foundations and Basements: The most appropriate material in the basis of resistance to hydrostatic pressure includes crystalline waterproofing system, bituminous systems, and cementitious systems.
Roofs and Terraces: Exposed applications can be done by using polyurethane, TPO, PVC and EPDM membranes that retain all flexibility and UV stability.

• Water Tanks: Waterproofing of water tanks and swimming pools with crystalline and epoxy waterproofing systems are the most appropriate products offering the chemical affinity and durability against the permanent exposure of the product with water.
• Bathrooms and Wet areas: These are usually waterproofed with cementitious water proofing, polyurethane and liquid applied membranes as they are easy to apply to small places.
• Bridges and Infrastructure: Structures such as bridges and Infrastructure are subject to high stress and weathering so membranes that create this strength and flexibility are manufactured out of PVC, bituminous coatings and polyurethanes.

Conclusion

All the waterproofing materials can be utilized, but the choice of the best material would depend on the project conditions, i.e. exposure conditions, structural movements, etc, as well as performance expectation. To protect both sides in a very thorough way, crystalline waterproofing is the perfect waterproofing technology because it has high long-term performance and self-healing characteristics, which is very suitable in essential uses.

Polyurethane Systems give great flexibility and are suitable in the region which has the tendency of movement or temperature change. Cementitious waterproofing is a good budgetary option in case of simple applications, whereas PVC and TPO are the only reliable membranes to cover the large areas.

To achieve the best final results, surface preparation, right techniques of application and general care is necessary irrespective of the waterproofing material used. Sometimes, the best waterproofing protection to concrete structures is a combination of various waterproofing systems.