Foundation Waterproofing

9 October 2025

SealteQ

Foundation

Are you facing moisture issues in the foundation of your commercial property or structure? A foundation that is not properly waterproofed can lead to rising damp, concrete damage, and structural problems. Addressing these issues in time is essential to safeguard the durability of your structure. At SealteQ, we offer innovative, effective solutions to waterproof your foundation and provide lasting protection against moisture.

Water can penetrate a foundation in several ways. Moisture problems often arise from a combination of factors, such as a high groundwater level, capillary action (the process by which water rises through small pores in materials), or poor maintenance. A key issue is that moisture enters not only from the outside of the foundation, but also from the underside and the interior.

You can compare it to placing a sponge in water: even with a barrier on one side, the sponge will continue to absorb moisture. This principle, capillary action, draws moisture up from the bottom of the foundation and spreads it through the material. Without an effective approach, such as a continuous water barrier or damp-proof membrane, the moisture will continue to cause foundation problems.

Moisture issues in the foundation can also be caused by the factors listed below. These issues underscore the importance of an integrated approach to foundation waterproofing.

Groundwater level: Fluctuations in groundwater can increase pressure on the foundation, allowing moisture to penetrate.
Expansion joints and cracks: Small openings in the foundation can cause water infiltration.
Rising damp: This type of moisture rises through the pores of the building material, leading to damage to walls and floors.

At SealteQ, we offer a wide range of solutions to waterproof foundations. Our step-by-step approach is designed to protect your structure for the long term and combat moisture:

1. Basement waterproofing

The basement in a building is often vulnerable to moisture problems, especially when it lies below the groundwater level. When we waterproof the basement at SealteQ, we use durable techniques and materials, which are explained in the following steps.

2. Concrete injection

Concrete injection is an effective method for repairing cracks and weak spots in concrete foundations. By injecting epoxy or polyurethane, cracks are filled and structural strength is restored. This process waterproofs the concrete and protects the structure against further damage from water pressure.

Concrete injection is not only suitable for small cracks; it can also be applied to more severe moisture issues. It is a fast, durable solution for foundations already experiencing moisture ingress.

3. Concrete coating

A concrete coating provides an additional protective layer for your foundation. This special coating, such as bitumen coatings or water-pressure-resistant concrete layers, protects the concrete against moisture ingress and chemical attack. Concrete coatings can be applied to both the interior and exterior of the foundation, providing long-term protection. Our specialists apply high-quality coatings suitable for various applications, from commercial buildings to large infrastructure projects.

What is Foundation Waterproofing?

Foundation waterproofing means sealing all gaps and pores so that no moisture can penetrate. This is done by injecting cracks with water-repellent material and applying a waterproof coating to the foundation surface. This stops rising damp and keeps the structure dry.

Why Waterproof a Foundation?

Waterproofing a foundation is necessary to prevent moisture issues and structural damage. A foundation that is not waterproofed leads to rising damp, concrete deterioration, and can compromise the building’s stability. Waterproofing protects the foundation and extends the service life of the structure.

Is a Concrete Foundation Waterproof?

A standard concrete foundation is not inherently completely waterproof. Without additional measures, moisture can enter the concrete through pores or cracks. That is why a foundation must be protected with moisture control measures (e.g., injections or coatings) to prevent rising damp and damage.

Do I Need to Waterproof the outside of My Foundation?

Waterproofing the outside (and other sides) of the foundation is necessary to keep moisture out. Water can penetrate the foundation from the outside, the underside, and the inside. That is why a foundation must be properly sealed all around to prevent rising damp and leaks.

How Does SealteQ Waterproof a Foundation?

SealteQ waterproofs foundations by protecting basements, injecting cracks, and applying a concrete coating to keep moisture out.

Are you experiencing moisture in your foundation or looking to take preventive measures? At SealteQ, we have over 50 years of experience applying advanced techniques to waterproof foundations. Our specialists start with a thorough analysis of your situation to determine the most suitable solution.

Our focus on quality, reliability, and customer-centric service makes us a trusted partner for protecting and preserving your foundation. Get in contact with SealteQ today and discover how we can protect your foundation against moisture for the long term.

Foundation repair canal Almelo de Haandrik

In a recent project in Daalerveen, SealteQ SLS specialists played a crucial role in the foundation repair of a building that had suffered extensive damage due to uneven settlement and a partially collapsed foundation. The issue with the home's foundation required a well-thought-out approach to prevent further damage while minimizing disruption to the residents during the foundation repair operation.

An increasing number of houses in the Netherlands are experiencing foundation damage. The causes vary, but the problem is significant and continues to grow. It is estimated that approximately 1 million homes in the Netherlands may face foundation problems. This information can be found on the website of the Knowledge Center for Foundation Problem Solutions (KCAF): www.kcaf.nl.