5 Cementitious Waterproofing Coatings: Uses, Pros and Cons

Written By Adam Paul – Waterproofing Expert

Cementitious waterproofing is one of the most used waterproofing membranes for buildings and constructions. Cementitious waterproofing is mixed with additives to enhance the flexibility, UV resistance, and breathability of the cementitious waterproofing layer. By considering all factors, we can categorize cementitious waterproofing into 5 main types.

Polymer-modified cement waterproofing
Elastomeric cementitious waterproofing coating
Acrylic cementitious waterproofing coating
Crystalline cementitious waterproofing
Slurry cementitious waterproofing

This cementitious waterproofing has slightly different properties. So we highly recommend that you use a compatible cementitious waterproofing membrane for your building waterproofing project. Contact Aqviz experts. We will help you to choose the best one.

1. Polymer Modified Cement Waterproofing

Polymer-modified cement waterproofing is a cement-based waterproofing system enhanced with polymer additives, such as acrylic, SBR (styrene-butadiene rubber), or latex. The polymer additives on the cementitious waterproofing help to enhance the flexibility, adhesion, and water resistance of the layer.

Hence, polymer-modified cementitious waterproofing can be used on basements, water tanks, balconies, bathrooms, and planters. It effectively resists both positive and negative water pressure, making it a reliable choice for moisture-prone structures. Polymer-modified cementitious waterproofing lasts 10 to 15 years. It withstands higher moisture, cracks, and minor structural movements.

Pros of polymer-modified cementitious waterproofing

Polymer additives prevent cracking and enhance adaptability over time
Polymer-modified cementitious bonds strongly to concrete, masonry, and metal surfaces
Polymer-modified cementitious material has good UV resistance
Polymer-modified cementitious material is breathable
Polymer-modified cementitious materials can be reinforced

Cons of polymer-modified cementitious waterproofing

Limited elasticity compared to liquid membranes
Requires a clean, well-primed surface for optimal bonding
Application thickness needs to be controlled

2. Elastomeric Cementitious Waterproofing Coating

Elastomeric cementitious waterproofing coating is a hybrid waterproofing system that combines cement-based waterproofing with elastomeric polymers, enhancing its flexibility and durability. Elastomeric cementitious waterproofing consists of cement-based powder, elastomeric polymer additives, sand or fine aggregates, and water. Due to the elastomeric properties, the waterproofing layer can stretch and accommodate minor structural movements without cracking.

Hence, elastomeric cementitious waterproofing can be used on rooftops, balconies, terraces, basements, and swimming pools. It is ideal for areas exposed to high water pressure and structural movement, ensuring a long-lasting waterproof barrier. Elastomeric cementitious waterproofing lasts 12 to 20 years. It withstands thermal expansion, moisture exposure, and dynamic structural stress.

Pros of elastomeric cementitious waterproofing

Elastomeric cementitious waterproofing has high flexibility, preventing cracks caused by structural movement
Elastomeric cementitious waterproofing bonds strongly to concrete, masonry, and brick surfaces
Elastomeric cementitious waterproofing resists high water pressure, making it ideal for wet areas and submerged structures
Elastomeric cementitious waterproofing has good UV resistance, allowing exterior exposure without degradation

Cons of elastomeric cementitious waterproofing

Higher cost compared to standard cementitious waterproofing
Requires precise mixing and multiple coats for maximum effectiveness
Surface preparation is crucial to ensure proper adhesion and durability

3. Acrylic Cementitious Waterproofing Coating

Acrylic cementitious waterproofing is a flexible waterproofing system that combines cement-based materials with acrylic polymers, enhancing adhesion, elasticity, and water resistance. Due to the acrylic polymer additives, the waterproofing layer provides enhanced elasticity, UV resistance, and durability on the concrete surface.

Acrylic cementitious waterproofing can be used on rooftops, facades, swimming pools, bathrooms, and balconies. It offers superior UV resistance and flexibility compared to standard cementitious coatings, making it suitable for exterior and exposed surfaces. Acrylic cementitious waterproofing lasts 12 to 20 years. It withstands moisture exposure, temperature variations, and minor structural movements.

Pros of acrylic cementitious waterproofing

Acrylic polymer additives enhance flexibility and prevent cracking on the cementitious layer.
Acrylic cementitious waterproofing has excellent UV resistance, making it ideal for exposed areas
Acrylic cementitious bonds strongly to concrete, masonry, and metal surfaces
Acrylic cementitious waterproofing is breathable, allowing moisture to escape without compromising performance

Cons of acrylic cementitious waterproofing

Higher cost compared to standard cementitious waterproofing
Requires multiple coats for optimal protection over the concrete surface

4. Crystalline Cementitious Waterproofing Coating

Crystalline cementitious waterproofing coating is a permeation-based waterproofing system that utilizes active crystalline chemicals to penetrate concrete and react with water and unhydrated cement particles. Crystalline cementitious waterproofing consists of cement-based powder, active proprietary chemicals, and fine silica sand.

Due to the crystalline reaction, the waterproofing layer penetrates deep into the concrete, sealing cracks and preventing water infiltration for a long time. Hence, it can be used on basements, water tanks, tunnels, foundations, and swimming pools. It provides permanent waterproofing protection as the crystalline growth continues to self-heal minor cracks over time. Crystalline cementitious waterproofing lasts the lifetime of the concrete structure. It withstands high water pressure, aggressive chemicals, and continuous moisture exposure.

Pros of crystalline cementitious waterproofing

Crystalline waterproofing penetrates deep into the concrete structure, offering permanent waterproofing
Crystalline cementitious waterproofing has self-healing properties, sealing minor cracks over time
Crystalline cementitious waterproofing resists high hydrostatic pressure, making it suitable for underground structures
Crystalline cementitious waterproofing can be applied to both new and existing concrete
Crystalline cementitious waterproofing is highly durable, lasting the entire lifespan of the structure

Cons of crystalline cementitious waterproofing

Not suitable for flexible or moving structures, as it does not provide surface elasticity
Requires moisture activation, meaning dry conditions may limit its effectiveness. The application requires skilled labor to ensure proper mixing and coverage

Cementitious-Crystaline-Formation — Crystaline formation in cementitious waterproofing

5. Slurry Cementitious Waterproofing coating

Slurry cementitious waterproofing coating is a rigid, cement-based waterproofing system. Slurry cementitious waterproofing consists of cement-based powder, fine aggregates (fillers), chemical binders, and water. Due to its easy application and strong adhesion, the waterproofing layer forms a dense, durable coating that prevents water penetration to the surface.

Therefore, slurry cementitious waterproofing can be used on basements, water tanks, swimming pools, tunnels, and retaining walls. It is highly resistant to positive water pressure and is often applied in areas exposed to constant water contact. Slurry cementitious waterproofing lasts 8 to 15 years. It withstands moisture exposure, mild chemical attacks, and direct water pressure.

Pros of slurry cementitious waterproofing

Slurry cementitious waterproofing is easy to apply with a brush or spray
Slurry cementitious waterproofing bonds strongly to concrete, brick, and masonry surfaces
Slurry cementitious waterproofing resists hydrostatic pressure, making it effective for below-grade applications
Slurry cementitious waterproofing is cost-effective compared to polymer-modified or crystalline waterproofing

Cons of slurry cementitious waterproofing

Limited flexibility, making it unsuitable for structures with movement or expansion
Requires multiple coats to achieve proper waterproofing performance
Not UV-resistant, requiring a protective layer if used in exposed areas

How to Apply Cementitious Waterproofing?

You should follow these 7 steps when applying cementitious waterproofing.

7 Steps to Apply Cementitious Waterproofing Layer

Prepare the concrete surface for cementitious waterproofing
Mix the cementitious waterproofing compound
Apply the first cementitious waterproofing coating
Wait for the curing of the cementitious waterproofing
Apply a second cementitious waterproofing layer
Apply additional cementitious waterproofing layers if needed
Protect the cementitious waterproofing layer

Aqviz experts have prepared this guide How to Apply Cementitious Waterproofing? with including all the detailed steps of cementitious waterproofing on the concrete. So we highly recommend that you read this comprehensive guide before starting your waterproofing project.