Which Cement Is Waterproof?

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Which Cement is Waterproof- JK Cement

Waterproofing is vital if you want to extend a building’s longevity. Water has the ability to seep into concrete, which in turn, can damage the internal and external walls of your home. By taking the right waterproofing decision at the time of construction, you can avoid large-scale repair works later. Here, you can get information about waterproofing and how water-resistant cement can be beneficial.

What is Waterproofing?

Waterproofing means protecting your surfaces from water, dampness or moisture, and their subsequent effects. When it comes to construction, concrete slabs, walls, roof, ceiling, etc., may require waterproofing depending on the usage of the space. Waterproofing can be done at the time of concrete mixing or by applying a waterproof coat after the concrete is dry.

Why Water Is Bad For Walls

External walls of the concrete are constantly exposed to the weather. Concrete being porous in nature, can soak up water. Concrete is made from cement, aggregates and water. The cement paste binds the aggregates to make a compact mix that is required to form structural elements like slabs, beams, columns, roof, etc. When the concrete cures, it forms a network of tunnels throughout the concrete. This network of tunnels is called a capillary system that facilitates the flow of water. The pores on the surface of the concrete are the openings of the tunnels. Therefore, water can easily permeate the concrete and cause water damage to the internal walls. Water can cause the concrete to crack and hinder its strength and durability. Also, prolonged moisture can lead to mould build up which is harmful for the occupants’ health. 

Which Cement Is Waterproof?

Note that waterproof cement does not exist. Cement is a binder that needs to be mixed with water to form a paste that binds aggregates in mixes like concrete, mortar and plaster. You can add certain chemicals known as additives to the mix to enhance the final product’s water-resistant capabilities. Typically, cement companies also add admixtures to the concrete during its mixing process to improve the concrete’s water repellent abilities. 

Types of Waterproofing 

Here are ways you can protect your home from water:

  • Cementitious Waterproofing

Cementitious waterproofing uses cement-based polymer which creates a strong and durable moisture barrier for concrete structures. It also provides breathability on the surfaces to resist mould or mildew. This type of waterproofing can be used in water treatment plans, parking structures, concrete roofs, etc.

  • Liquid Waterproofing

Liquid waterproofing membranes are painted or sprayed on the walls. They form an elastic membrane that provides water resistance to the walls. Compounds such as cement, silicone, polyurethanes, acrylic copolymers, resins, etc., can be used for liquid waterproofing. 

  • Bituminous Coating

Bitumen is a sticky and highly viscous form of petroleum, also known as asphalt. Bitumen-based coating is typically applied to roofs, pavements and other concrete structures. Note that prolonged exposure to the sun may not retain the bituminous well. 

  • Admixtures

Admixtures are materials other than water, aggregates and cementitious materials added to a concrete mix to enhance its various properties, be it hardening, durability or waterproofing, among others. 

Waterproofing Process

The following are general steps involved in waterproofing:

  1. Clean the surface to free it from loose materials, oil and dust. 
  2. Fill in any cracks with concrete to ensure there are no gaps in the surface.
  3. Apply a primary waterproofing coat to prime the structure. Apply multiple coats if required. 

What are the Advantages of Waterproofing Concrete?

Here’s why waterproofing is important:

  • It is easy to apply. 
  • It reduces water absorption.
  • It increases the concrete structure’s life span.
  • Any reinforcements in the concrete are protected from rust. 
  • It prevents dampness and seepage inside the building from ceilings and walls.
  • It prevents formation of cracks on the concrete.

Keep your walls dry with JK Super Protect Weather Shield Cement.


Is cement waterproof?

Cement, in itself, is not waterproof. It mixes with water to form a cement paste that binds aggregates in various construction mixes like concrete, mortar and plaster. However, you can add admixtures or additives that possess water resistant properties that make the final mix water resistant when it hardens.

How does water-resistant cement work?

Water-repellant additive is added to cement, which, when mixed with water blocks the pores of the concrete structures. This improves the damp-proofing capacity of the concrete. 

How do I make concrete water-resistant?

Since most of your house is typically made up of concrete, you can make your concrete water-resistant by using less water when making the concrete mixture. The more the water, the more trapped air pockets, resulting in capillary pores that allow passage of water. You can also add admixtures to the concrete mix to improve its water-resistant properties. Certain surface coatings used for concrete finishing can also make the concrete resistant to water. 

Which waterproofing method is best for an old roof?

The best way of waterproofing an old roof depends on your preference, budget, age of the roof and its overall surface conditions. Whatever method you choose, a ponding test can help you determine how effective the waterproofing is. 

What is the cost of waterproofing a roof?

The cost of waterproofing a roof can depend on factors such as the waterproofing method, roof size, complexity in the structure, your location, etc. Typically, the cost can be in the range of several hundred rupees per square foot. It is best to talk to a contractor and find out the actual price based on the aforementioned factors.

How long does waterproofing last?

Typically, quality waterproofing should last for at least ten years. Hence, it is important to invest in top quality waterproofing solutions. Poor quality waterproofing will not last long and you’ll probably have to spend more money to get it fixed.

Which areas of the home need waterproofing?

Any area in your home that is continuously exposed to water needs waterproofing. These include the bathroom, roofs, balconies, certain sections of the kitchen and basements. 

*Disclaimer: The information provided above is for general purpose and should not be used as a substitute for professional advice. 

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