What is waterproofing in construction

Waterproofing is often not at the forefront of homeowners’ considerations during the construction process, yet its significance cannot be overstated. Waterproofing is a vital aspect of construction that ensures the structural integrity and longevity of a building by offering protection against water damage. It is an essential measure that should be implemented from the initial stages of construction to safeguard the property. This article aims to underscore the critical importance of waterproofing in construction, explain the types of waterproofing in construction, and highlight the advantages involved in waterproofing. 

Importance of Waterproofing in Construction

Waterproofing is a crucial element in construction, acting as the first line of defense against water damage. Here is why it is so important:

Protects the Building Structure and Stability

Waterproofing safeguards the building’s structural integrity by preventing water infiltration. This helps prevent corrosion, cracks, erosion and other issues that can weaken the foundation, columns, beams, walls, and slabs.

Ensures a Healthy Indoor Environment

Water intrusion can lead to dampness, which fosters the growth of mold and mildew. These can trigger respiratory problems and allergies for occupants. Effective waterproofing keeps the indoor environment dry and healthy.

Increases Durability and Longevity

By preventing water damage, waterproofing extends the lifespan of a building and its components. This reduces the need for costly repairs and replacements down the line.

Improves Energy Efficiency

Moisture can compromise the insulating properties of building materials. Proper waterproofing helps maintain optimal insulation, leading to lower energy consumption for heating and cooling.

Enhances Aesthetics and Value

Water damage can lead to unsightly stains, peeling paint, and structural issues. Effective waterproofing helps maintain the building’s aesthetics and contributes to its overall value.

Types of Waterproofing in Construction

There are various waterproofing methods used depending on the location and application:

External Waterproofing Systems (applied on the outside of the building)

For Concrete Foundations

External waterproofing systems are applied to exterior foundation walls to prevent water infiltration and leakage into the basement or crawl space. They act as the first line of defense against moisture intrusion. Some of the most common types of external waterproofing systems used are bituminous coatings, liquid-applied waterproofing membranes, sheet membranes, foundation coatings, etc. 


Our solution: POLYALK WPB: Polymer-modified bituminous coating

For External Walls

External wall waterproofing systems are crucial for protecting buildings from the damaging effects of rainfall . The waterproofing process involves the application of waterproofing coatings, and liquid waterproofing membranes directly onto the exterior walls. These methods form a thin, protective layer that prevents water from seeping into the walls as well as gives the external walls an aesthetic finish and look.  


Sunanda Global’s innovative waterproofing system, which includes POLYALK WP and Polyfill AR, is one of the best solutions available in the market. POLYFILL AR is a crack filler for plasters, IPS, cement sand screeds, and non-structural cracks, while Polyalk WP is a base waterproofing coat with high flexural strength, extraordinary adhesion, and alkaline compatibility. This is followed by the application of two coats of SUNACE, waterproof acrylic paint. 

For Roofs

External waterproofing systems used for roofs generally involve applying a waterproofing layer on the roof surface to prevent water ingress. This defense will prevent leaks that can damage the interior of your structure, promote mold growth, and lead to costly repairs. Solutions like bituminous membranes, polyurethane coatings, etc, can be used on the roofs.


Our solution: SUNKOTE WP+: single-component acrylic waterproofing coating 

For Water Retaining Structures Like Swimming Pools and Water Tanks

For the retaining structures, external waterproofing systems are crucial for preventing leaks and ensuring the structural integrity of the containment unit. Some of the most common and effective external waterproofing systems used are cementitious waterproofing, liquid-applied waterproofing membranes, waterproofing admixtures, etc. 


Our solution: SUNPROOF PU1K: Single component, liquid-applied polyurethane membrane  concrete

Internal Waterproofing Systems (applied on the inside of the building)

For Toilets, Balconies, and Kitchens

Toilets, by their very nature, deal with a lot of water. While most of the water is contained within the plumbing system, there’s always the possibility of leaks or overflows that can damage your bathroom and even rooms below. Sunanda Global’s waterproofing system for toilets involves duct several steps, including the application of a waterproofing coat of POLYALK WP and cement slurry. The system also involves the injection of grout into the sunken slab to fill any voids and ensure a watertight seal.


The same coating of POLYALK WP must be applied for balconies and kitchens as well. 


What Happens When You Skip Waterproofing in Construction?

Skipping waterproofing solutions can cause severe damage to your property. The following is the breakdown of a few. 

Structural Damage

  • Cracks and Erosion: Water corrodes the steel reinforcement in concrete and causes cracks and structural damage in the building compromising structural integrity.
  • Corrosion: Metal components, including support beams and pipes, can rust and eventually fail.
  • Spalling and Efflorescence: Water causes materials to crumble and leaves unsightly salt deposits.

Aesthetics and Functionality

  • Moisture Damage: This leads to peeling paint, warped wood, and mold growth, affecting the building’s appearance and usability.
  • Reduced Space: Severe damage may require extensive repairs, reducing the building’s usable space.

Health Concerns

  • Mold and Mildew: These can cause respiratory issues and allergies.
  • Insect Infestation: Moisture attracts damaging insects like termites.


Waterproofing is not an option, it is vital for preserving your building’s structural integrity, life, safety, appearance, and well-being of its occupants. The risks of neglecting this critical aspect range from structural damage to health hazards, highlighting the importance of proactive measures. Given the technical complexity of waterproofing, seeking the expertise of the best waterproofing company is a wise decision. A reputable provider can tailor solutions to your property’s specific needs, ensuring long-lasting protection. As you plan your next construction project, remember that investing in quality waterproofing services is investing in your property’s future.