Foundation Strengthening

9 October 2025

SealteQ

Foundation

Are you aware of the risks of a weakened foundation? Settlement, cracking, and instability can have serious consequences for the safety and durability of your property. At SealteQ, we understand the importance of a solid foundation as the basis for every structure. On this page, you will learn about the causes of foundation problems, how to recognize them, and which techniques our specialists apply to strengthen existing foundations.

Foundation problems such as settlement or cracking arise from a combination of factors that can compromise a building’s stability. Timely recognition of the causes below is essential to prevent further damage and safeguard the structure’s safety.

Foundation problems are most prevalent in the north and west of the Netherlands. According to the Kennis Centrum Aanpak Funderingsproblematiek (KCAF), this is due to low soil quality, such as peat or clay soils in these areas.
A changing moisture balance, caused by extremely wet or dry periods, can lead to expansion or shrinkage of the soil, making the foundation unstable.
Construction defects and age also play a role, especially in buildings whose foundations were not designed for current load requirements.
External influences, such as excavation work, traffic vibrations, or underground construction projects, have a negative impact on the structural integrity of the foundation.

Early Signs of Foundation Problems

Detecting foundation problems early can prevent serious damage. In commercial buildings and residential projects, the following signs are common. If you recognize these signs, it is important to take action and reinforce the foundation of your home.

Cracks in walls: Horizontal cracks in exterior walls or vertical cracks around windows and doors often indicate foundation problems.
Uneven floors: When floors become noticeably uneven, this may point to settlement of the foundation.
Sticking doors and windows: If doors or windows suddenly become difficult to open or close, this may be due to shifts in the foundation.
Leaning chimneys: A chimney that is out of plumb is a clear indication of structural problems in the foundation.

A concrete foundation is reinforced by stabilizing the subsoil and restoring the concrete. Often, a special resin is injected into the soil beneath the foundation (ground stabilization) to increase bearing capacity. Any cracks or concrete deterioration in the foundation are repaired through concrete repair.

SealteQ SLS (Slab Lifting and Stabilization) is part of SealteQ and specializes in sustainable foundation strengthening, applying various techniques. Beforehand, we can carry out a foundation assessment to determine which of the specialties below is most suitable for your situation:

1. Ground stabilization

Ground stabilization strengthens the soil beneath the foundation using advanced techniques. We inject SLS polymer resins into non-load-bearing soil layers to increase bearing capacity. The resin is lightweight, putting minimal load on the subsoil, while offering high compressive strength, which makes it highly suitable for strengthening the foundation.

2. Concrete repair

At SealteQ, we specialize in concrete repair. During the foundation assessment, we examine, among other things, the quality of the concrete. If there is damage to the concrete surfaces, concrete repair is an important next step in restoring the foundation. We use durable materials and methods that strengthen the concrete structures and foundation and protect them against future damage.

How Do You Strengthen a Concrete Foundation?

A foundation is strengthened by stabilizing the subsoil with resin injections (ground stabilization) and by repairing cracks or concrete deterioration (concrete repair).

Is Foundation Repair Mandatory?

Not by law, but municipalities can require it in cases of serious defects that endanger the safety of the property.

How Do I Recognize Foundation Problems?

You can identify them by cracks in walls, uneven floors, sticking doors or windows, and leaning chimneys.

Why is Foundation Repair Important?

A weakened foundation can lead to settlement, cracking, and instability, undermining the safety and durability of your property.

Have you noticed signs of foundation problems, or would you like to take preventive measures by having the foundation strengthened? Then contact SealteQ today.

With more than 50 years of experience and a strong focus on quality and innovation, SealteQ is your reliable partner for strengthening foundations. Discover how we can help you.

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.