How to Make Cement, Concrete and Mortar Waterproof
Waterproof cement screed is easy to make with Cementmix. Simply replace the mixing water with Cementmix to create waterproof screed from the inside. Unlike surface coatings, Cementmix becomes part of the cement itself, creating a permanent waterproof barrier that cannot peel, crack or wear away. It is suitable for screeds, concrete, mortar and plaster and also improves strength while reducing water penetration.Cementmix creates permanent waterproof cement from within by replacing the mixing water.
How to Make Cement, Concrete and Mortar Waterproof
Making cement, concrete and mortar waterproof is one of the most effective ways to prevent water damage, rising damp and premature deterioration. Instead of relying on surface coatings that can crack or wear away, Cementmix waterproofs the material from the inside by completely replacing the mixing water.
The result is permanently waterproof concrete, mortar, screeds and cement-based plaster with improved strength and durability. Whether you’re building a basement, repairing a concrete floor or installing a waterproof screed, this guide explains how to achieve long-lasting protection.
How to Make Waterproof Cement
Waterproof cement is created by replacing 100% of the mixing water with Cementmix.
Although concrete and cement appear solid, they contain millions of microscopic pores and capillaries that allow water to penetrate over time. By replacing the mixing water with Cementmix, the mortar becomes permanently waterproof from the inside instead of relying on a surface coating.
Waterproof mortar is ideal for bricklaying, rendering, pointing and repairs where long-term protection against moisture is required. Because the waterproofing is built into the mortar itself, it cannot peel, crack or wear away like a surface treatment.
How Does Cementmix Make Cement Waterproof?
Cementmix works differently from traditional waterproof coatings. Instead of forming a protective layer on the surface, it completely replaces the mixing water and becomes part of the cement during hydration.
Because the waterproofing is built into the concrete or mortar itself, it cannot peel, crack or wear away. The result is stronger, denser and permanently waterproof concrete, mortar, screeds and cement-based plaster.
Simply replace 100% of the mixing water with Cementmix and mix as you normally would. No additional waterproofing additives or surface sealers are required.
Frequently Asked Questions
Can Cementmix replace water?
Yes. Cementmix completely replaces the mixing water and waterproofs cement from the inside.
Can Cementmix be used in concrete?
Yes. Cementmix is suitable for concrete floors, foundations, retaining walls, swimming pools, water tanks and other concrete structures where permanent waterproofing is required.
Can Cementmix be used for mortar and plaster?
Yes. Cementmix can be added to mortar and cement-based plaster to improve waterproofing, durability and strength.
Can waterproof mortar be painted?
Yes. Once fully cured, waterproof mortar made with Cementmix can be painted or finished like conventional cement-based mortar.
Is Cementmix a surface coating?
No. Cementmix becomes part of the cement during mixing, providing permanent waterproofing throughout the material rather than only on the surface.
For more information about waterproof concrete, read our guide on waterproof concrete with Cementmix.
Making mortar
Mortar is made by mixing cement, sand and a liquid. Traditionally, this liquid is water, but when permanent waterproofing is required, the mixing water can be replaced completely with Cementmix.
Cementmix becomes part of the cement during hydration, creating waterproof mortar from the inside out. Unlike surface sealers, the waterproofing cannot peel, crack or wear away because it is integrated throughout the entire mortar.
Waterproof mortar is ideal for bricklaying, rendering, pointing, repairs and other applications where long-term resistance to moisture is required. It also improves the durability of the finished mortar while maintaining normal workability during mixing and application.
Always use clean cement and sand, and replace 100% of the mixing water with Cementmix. Mix thoroughly until the mortar has a consistent texture before application. For the best results, only prepare the amount of mortar that can be used within approximately one hour.
Waterproofing mortar
Traditional mortar is not waterproof. Over time, water can penetrate through the pores and capillaries in the cement, leading to rising damp, frost damage, mould growth and deterioration of the surrounding structure.
By replacing the mixing water with Cementmix, the mortar becomes permanently waterproof throughout its entire thickness. This makes it ideal for foundations, basements, retaining walls, swimming pools, bathrooms and other areas exposed to constant moisture.
Because the waterproofing is built into the mortar itself, there is no surface coating that can peel, crack or wear away. The result is long-lasting protection with minimal maintenance.
Cementmix is a liquid waterproofing additive that completely replaces the mixing water in cement, mortar, concrete and cement-based plaster. During hydration, it becomes part of the cement structure, creating permanent waterproofing throughout the entire material.
Unlike surface sealers, Cementmix cannot peel, crack or wear away because it is integrated into the concrete or mortar itself. The material remains vapour permeable while preventing water penetration, helping to reduce moisture damage, frost damage and concrete deterioration.
Cementmix is suitable for DIY users and professionals alike. Simply replace 100% of the mixing water with Cementmix and mix as normal. It can be used for foundations, basements, concrete floors, retaining walls, swimming pools, bathrooms, terraces and many other cement-based applications where permanent waterproofing is required.
Example Cementmix
The sample on the left was made with Cementmix, while the sample on the right was mixed with water. After curing and exposure to water, the difference is clearly visible.
The Cementmix sample remains dry because the waterproofing is built into the cement itself. The untreated sample absorbs water through its pores and capillaries, demonstrating why internal waterproofing provides long-lasting protection.
Whether you are building a new concrete floor, laying a waterproof cement screed or preparing mortar and plaster, Cementmix provides permanent waterproof cement from within., waterproofing a basement, laying mortar or installing a screed, Cementmix provides permanent waterproofing from within. By replacing 100% of the mixing water, it creates stronger, more durable and permanently waterproof cement-based materials without relying on surface coatings that can peel or wear away.
