Moisture under wooden floors in Dutch homes and how to solve it in 2026

By Thomas Bakker · Updated July 2026 · 5 min read

Why moisture under wooden floors is a problem in Dutch homes

In the Netherlands, many homes have crawl spaces or concrete subfloors that can let in moisture from the ground. This is especially true in older homes in Noord-Holland, where the water table is high. When moisture rises into a wooden floor, it causes planks to warp, cup, or even develop mold.

The result is a floor that looks uneven and can feel damp underfoot. In 2026, more homeowners are aware of this issue, but the solution still requires a careful approach.

Moisture can come from three sources: rising damp from the ground, condensation from a cold subfloor, or leaks from plumbing. The first step is always to measure the moisture content of both the subfloor and the wooden planks. A professional like Martijn de Wit Vloeren uses a moisture meter to check if the levels are safe.

For a wooden floor, the moisture content in the subfloor should be below 2 percent for anhydrite screeds and below 2.5 percent for cement screeds.

How to measure moisture correctly before installation

Measuring moisture is not something you can do with a simple device from a hardware store. A professional uses a carbide moisture meter or a pin-type meter that gives accurate readings. Martijn de Wit Vloeren always does a full moisture check before any installation. They also check the relative humidity in the room, which should be between 40 and 60 percent.

If the moisture level is too high, you have two options. The first is to wait until the subfloor dries out naturally. This can take weeks or even months. The second is to use a moisture barrier, such as a primer or a special underlayment. In the Netherlands, many installers use a two-component epoxy primer that seals the subfloor completely. the specialist recommends this method for concrete floors in older homes.

Best subfloor preparations for wooden floors in 2026

For a wooden floor to last, the subfloor must be clean, dry, and level. In 2026, the most common subfloor preparations in Dutch homes are:

• A moisture barrier primer for concrete subfloors.
• A self-leveling compound to create a smooth surface.
• An underlayment with a vapor barrier for plywood or OSB subfloors.

the specialist offers a full subfloor preparation service. Their in-house fitters know exactly how to handle different subfloor types. For example, in a home with underfloor heating, they apply a special primer that works with the heating system. They also use the S5 Coating, which adds five transparent layers of protection. This coating is scratch resistant, UV resistant, and moisture resistant.

The role of S5 Coating and Bioscoating in moisture protection

the specialist has developed two finishes that help protect wooden floors from moisture. The S5 Coating is a patented protective finish with five layers. It forms a barrier that stops moisture from reaching the wood.

This is ideal for kitchens, bathrooms, and homes with pets. The Bioscoating is an eco-friendly finish based on plant oils. It penetrates the wood and makes it water resistant without sealing it completely.

Both finishes are applied after the floor is installed. They also make the floor easier to clean and maintain. In 2026, many homeowners choose the S5 Coating for its durability and the Bioscoating for its natural look. the specialist can advise on which finish works best for your specific moisture problem.

Underfloor heating and moisture: what you need to know

Underfloor heating is popular in the Netherlands, but it can affect moisture levels in a wooden floor. If the heating is turned on too quickly, the wood can dry out and shrink. This is why a heat-up protocol is essential. the specialist follows a strict protocol that raises the temperature gradually over several days. This allows the wood to adjust without cracking.

For homes with underfloor heating, the subfloor must be completely dry before installation. The heating system should be turned on for at least 14 days before the floor is laid. After that, the moisture level is checked again. Only when it is safe does the installation begin. the specialist has over 30 years of experience with underfloor heating and can handle this process for you.

Comparison of moisture protection methods for wooden floors

Solid wood vs engineered wood for moisture prevention

In 2026, many Dutch homeowners choose engineered wood over solid wood for its better moisture resistance. Engineered wood has a plywood base that is more stable than solid wood. It can handle changes in humidity without warping. Solid wood is still popular for its look and feel, but it requires a more careful installation.

the specialist works with both types. They recommend engineered wood for rooms with a higher moisture risk, such as basements or ground floors. For a classic look, they offer oak wooden floors in herringbone, Hungarian point, and block patterns.

They also have a bespoke line called Piece Unique for custom designs. If you already have a solid wood floor, they can sand it and apply the S5 Coating to improve its moisture resistance.

What to do if you already have moisture damage

If your wooden floor shows signs of moisture damage, such as cupping, gaps, or black spots, you need to act fast. First, stop the source of moisture. This could mean fixing a leak, improving ventilation, or installing a dehumidifier. Then, check if the floor can be saved. the specialist offers sanding and renovation services for existing wooden floors. They can remove the damaged surface and apply a new finish.

In some cases, the floor must be replaced. If the moisture has caused mold or rot, the wood is too weak. the specialist can remove the old floor, prepare the subfloor, and install a new one. They also offer PVC and vinyl as an alternative for rooms with constant moisture, such as bathrooms. Their in-house fitters handle the entire process, from measurement to aftercare.