5 Types of Cementitious Waterproofing

Waterproofing is important when it comes to construction. You want to take whatever possible measures you can regarding the implementation of safeguards for water infiltration. Such occurrences can lead to damaging effects that can harm the strength and integrity of cementitious materials.

This guide will cover five different methods of cementitious waterproofing. You will learn how to protect cement-based materials from water penetration once it is applied to your construction project. These methods will cover details regarding the unique characteristics, applications, and advantages.

Likewise, we will also take a look at the disadvantages of each approach. This will give you enough information to make a decision on which method to use for your construction projects. These apply to both a residential, commercial, and industrial construction setting.

Ready to go? Here’s a look now at the list of waterproofing methods to know about.

1. Integral Crystalline Waterproofing

Integral crystalline waterproofing is one of many methods we’ll look at where a water-resistant barrier is created. This involves adding crystalline admixtures to the concrete mix while it is in the batching stage. The admixtures will react with the moisture and free lime in the concrete to where it forms insoluble crystals, which will in turn create an effective seal for the capillary pores.

One of its major advantages is long-lasting protection since the crystalline formation is permanent to the concrete structure. If you are building something new or rehabilitating existing structures, using integral crystalline waterproofing will be a good method to use. It also can be useful for applications in basements, tunnels, or applications that are “below-grade”.

Among its disadvantages, it can command a higher upfront cost compared to other methods. The application process will need to be careful, making the application process a bit complex.

2. Flexible Cementitious Waterproofing

Next, we’ll be looking at flexible cementitious waterproofing. This will often be used in projects where structural movements are typically expected. These include expansion joints or building facades.

This waterproofing method accommodates minor substrate movements while retaining its overall effectiveness. To ensure better flexibility and durability, this method includes additives derived from polymer. It also is useful for plenty of applications from balconies to terraces among other construction projects.

The purpose of this waterproofing method is that it can create an elastic-like membrane that can handle substrate movements without developing any cracks. It can bond with substrates while making it durable for the long-term with applicable construction applications.

However, it may not be suitable for extreme structural shifts. It may also not possess a strong level of chemical resistance compared to some waterproofing approaches.

3. Acrylic-modified Cementitious Waterproofing

Acrylic-modified cementitious waterproofing consists of the combination of water-resistant properties of cement with acrylic polymers. They are combined to enhance the adhesion, flexibility, and overall performance of cementitious coating.

It can be supplied as a pre-packaged mix, making the application process as simple as possible. This will be suitable for both horizontal and vertical surfaces. If you are looking for a versatile waterproofing method, this is one that shouldn’t be overlooked.

This will work with various substrates like concrete, wood, and masonry. One of its biggest benefits is the ability to provide UV resistance so it protects exterior applications that may be in danger of receiving damage due to the sunlight. If consistent exposure to the sun is a concern, it is important to consider this waterproofing method for such construction applications.

You will need to use this in an area where light traffic is common. It cannot be applied in areas where it is the opposite (heavy traffic). Finally, it may not be able to bridge larger cracks that have already been formed.

4. Polyurethane-modified Cementitious Waterproofing

This waterproofing approach includes polyurethane additives. The result of this approach is providing a waterproofing solution that is durable and flexible. Furthermore, its purpose is to contribute to the coating’s elasticity while enhancing resistance to abrasion and its crack-bridging ability.

The application of this waterproofing method is highly recommended in areas where mechanical wear is a common concern. Likewise, it can also be applied in high traffic areas. For example, parking decks, industrial floors, and areas that often get exposed to frequent use or heavy loads can benefit from this waterproofing method.

One of its biggest advantages is the resistance to chemicals and abrasions. If you are looking for something that is appropriate in conditions where harsh conditions are prevalent, the polyurethane-modified cementitious waterproofing method may be the better option. It can also work with various substrates while enhancing the adhesion of the coating.

Like the integral crystalline approach, the cost and complexity of the application process are the biggest disadvantages. 

5. Non-shrink Cementitious Waterproofing

This final waterproofing method is formulated to eliminate shrinkage during the curing process. Shrinking occurs with traditional cementitious materials, which will result in cracks and waterproof barriers being compromised. This features non-shrink additives that counteract the natural shrinkage of cement.

If any form of shrinkage is unacceptable, it is important to use this type of waterproofing in applications that are critical. This includes but is not limited to water storage tanks, tunnels, and reservoirs. This waterproofing method can make sure that the waterproofing layers remain intact. 

While it may cost a bit more upfront, it won’t be as flexible of a waterproofing system compared to the others. So it is important to make the determination of non-shrink cementitious waterproofing appropriate to apply.

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