Is Waterproof Concrete Worth It? Expert Guide

You might be surprised to learn that standard concrete is not fully waterproof, as its composition allows moisture to pass through over time.

For projects where water resistance is critical, waterproof concrete can provide an effective solution.

In this guide, we’ll explain what it is, how it differs from standard concrete, and its advantages and disadvantages.

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What Is Waterproof Concrete?

This concrete is specifically designed to reduce or prevent water penetration into the concrete structure. It’s achieved by using waterproofing admixtures during mixing, reducing the water-to-cement ratio, improving compaction, or combining several methods.

Unlike traditional concrete, it has lower permeability.  That makes it more resistant to water ingress. Some waterproof concretes also contain crystalline additives that react with moisture to form microscopic crystals within the concrete’s pores, helping block potential water pathways.

The result is a stronger, denser concrete that offers improved protection against moisture-related issues.

5 Advantages of Waterproof Concrete

Enhanced Water Resistance

The primary benefit is its ability to resist water penetration. This makes it ideal for structures exposed to groundwater, heavy rainfall, or standing water.

Improved Durability

Waterproof concrete helps protect against long-term problems, including freeze-thaw damage, reinforcement corrosion and structural deterioration.

Reduced Maintenance Costs

This concrete can reduce the need for repairs, remedial work and ongoing maintenance.

Protection Against Corrosion

Steel corrodes when water comes into contact with it. Waterproof concrete limits moisture and reduces rust and structural weakening.

Suitable for Below-Ground Structures

Basements, foundations, retaining walls, and underground car parks benefit from concrete that is waterproof, due to constant moisture and groundwater pressure.

Need Expert Advice?

Speak to the team at Flowmix Tewkesbury, Gloucestershire or Aldridge, Walsall. We are happy to help with all your concrete requirements. Contact us by email or telephone.

Flowmix Tewkesbury: Tel: 01684 217888 Flowmix Walsall: Tel: 01922 741731

4 Disadvantages of Waterproof Concrete

✅ Higher Initial Cost: It costs more than standard due to specialist admixtures and extra quality control.

✅ Requires proper installation: Even the best waterproof concrete fails if poorly placed, compacted, or cured. Good workmanship is essential.

✅ It’s not always entirely waterproof: While waterproof that is concrete greatly reduces water penetration, it is not always immune. Cracks, poor joints, or structural movement can still let water in.

✅ You may still need additional waterproofing: In some cases, particularly below ground, waterproof concrete is used with membranes or other systems for maximum protection.

How Waterproof Is Normal Concrete?

You may assume concrete is naturally waterproof, but it isn’t. Standard concrete is water-resistant, not waterproof, as it contains millions of microscopic pores and capillaries. Over time, water migrates through these pathways, especially with constant moisture or pressure.

Standard concrete permeability depends on factors such as the water-to-cement ratio, mix design, compaction quality, curing methods and the presence of cracks.

High-quality, low-water-to-cement concrete resists water well but rarely matches the protection of dedicated waterproof concrete.

Conclusion

Waterproof concrete can make a difference in projects where moisture is likely to be an ongoing issue. By slowing down water ingress, it helps protect the structure itself and can reduce the likelihood of costly repairs further down the line.

If you’d like advice on the best concrete for your project, the team at Flowmix is always happy to help.

How Flowmix Can Help with Your Project

Flowmix has two plants, Gloucester and Walsall. We provide the following services (with time slots):

✅ Ready-mix concrete, mix on-site (volumetric concrete)
✅ Traditional and liquid screed.
✅ Concrete line pump Hire to reduce manual labour and associated costs, increase efficiency, reduce wastage and clean up.
✅ Interlocking concrete blocks for temporary or permanent barriers.
✅ Mini-Mix loads up to 4 cubic metres.

Flowmix holds the BSA-approved Ready Mix Concrete Kitemark KM683844, a certification that “confirms a product or service’s claim has been independently and repeatedly tested by experts” (source BSI).

Flowmix Tewkesbury: Tel: 01684 217888 Flowmix Walsall: Tel: 01922 741731

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