Gaps and gaps in wooden floors: Causes and most effective solutions in 2026

Gap in wooden floor (open-groove wooden floor, wooden floor with horizontal groove) is a condition when the horizontal groove joints between wooden floor panels do not fit together, creating grooves and gaps. The cause may be due to improper installation, poor quality of wooden floor, sudden changes in temperature, humidity or the floor has been flooded for a long time without maintenance.

Gaps in wooden floors not only reduce the aesthetics of the floor but also create problems such as warping, mold, termites, accumulated dirt and water, reducing the life of the floor and creating conditions for bacteria and mold to grow, causing danger to users during movement.

Why should we treat open wooden floors early?

Treating gaps in wooden floors early is necessary to avoid serious long-term consequences such as limiting warping, reducing the risk of mold and termites, and preventing dust accumulation.

• Avoid warping: When the wooden floor has gaps for a long time, it will lead to the wooden floor warping. During use, it will be dangerous when moving on the floor.
• Reduce the risk of mold and termites: Gaps in wooden floors create ideal conditions for mold and termites to grow, weakening the structure and reducing the lifespan of the wooden floor.
• Prevent dirt from accumulating in the gap: Gaps between floorboards also cause dirt to accumulate, making cleaning difficult.

What causes gaps in wooden floors?

From environmental conditions to installation, there are many factors that can cause gaps in wood floors. Here are the four main causes of this problem.

Installation not according to recommended techniques

This is mainly due to the construction worker not following the manufacturer's recommendations, such as leaving a gap of 12 - 18mm between the floor and the wall of the wrong size. The floor does not have the appropriate expansion space, causing the locking groove to be pushed and causing the groove to run, creating unwanted gaps.

Flooring quality does not meet construction standards

Poor quality floorboards are often designed with weak locking grooves and loose joints, causing the grooves to break, run, or open during use.

Effects of weather conditions

Temperature and humidity are also important factors affecting the condition of the floor joints. When the temperature changes suddenly above 40 - 50 ℃ continuously and for a long time, it will cause the floorboards to shrink, creating gaps on the floor surface.

Floor flooded for a long time

Prolonged flooding is also the cause of the wooden floor swelling and after wiping the flooded water layer, the floor will naturally shrink, leading to gaps in the joints. Because the floorboards will swell unevenly, creating gaps between them. To protect the wooden floor to be durable and beautiful, it is necessary to pay attention to keeping the floor surface dry and handling it promptly. When there is a flooding incident, contact the supplier immediately.

How to fix open wooden floors effectively

Depending on the level of floor gap and the cause, we can apply some of the following methods to fix it.

Adjust temperature and humidity

Maintaining a stable temperature of 25 – 30℃ in the living space can help prevent the floor from running. Therefore, homeowners can plant more trees or use air conditioning to control the temperature.

Dismantle and reinstall the floor properly

When the wooden floor has too many gaps, there is no other way but to disassemble and reinstall. However, users should not arbitrarily seal the gaps with glue but should seek reputable wooden floor repair services to solve the problem most thoroughly.

Benefits of choosing the right type of wooden floor for the installation location and professional construction team, quality products

Choose quality wooden floors, professional construction team and reputable supplier with more than 10 years of experience in the field of supply. laminate flooring will bring many benefits such as:

• The floor will no longer have horizontal gaps.
• Durable wooden floors over time contribute to bringing comfortable experiences to consumers.
• Limit the floor from making noise when moving on the wooden floor
• Laminate flooring has a lifespan of 10 – 25 years, and saves on repair and maintenance costs.
• Enjoy genuine product warranty policy from supplier.

How to prevent gaps in wooden floors

To prevent gaps in wooden floors, users need to note the following information.

Assemble wooden floors at the construction site and unpack the wooden boxes 48 hours (2 days) before construction.

This is to provide enough time for the wooden floor to adapt to the environmental conditions at the installation site, creating the necessary stability before proceeding with the floor installation. Thanks to this resting period, the wooden floor can adjust to the shrinkage or expansion, helping to ensure that the floor construction process will take place smoothly and most effectively.

Leave a gap between the floor and the wall to allow the wooden floor to expand properly.

The expansion gap between the floor and the wall is 12mm – 18mm, depending on the thickness of the floorboard. This gap acts as an “expansion point” for the wooden floor, allowing the material to expand and contract naturally without putting pressure on the locking joints.

Lay foam underlay on wooden floor if floor does not have built-in rubber base

In case the floor does not have a rubber base, using foam underlay is an effective measure to improve the stability and life of the floor. This foam underlay acts as a barrier between the wooden floor and the substrate, preventing moisture from seeping back into the floorboard, supporting soundproofing and insulation.

Disconnect the wooden floor if the length and width of the floor exceed 7m.

For large spaces, when the length or width of the floor exceeds 7m, it is necessary to cut the floor with a T-brace to create stability. This helps to avoid warping and gaps.

The cement floor must be dry and the cement floor surface must be smooth before installing the wooden floor.

Before installing the wooden floor, it is necessary to ensure that the cement floor is completely dry and the flatness reaches 2mm/1000mm. If the floor is not dry and still has high humidity, moisture from the floor will penetrate into the floorboards, causing the floor to warp, blister and have gaps.

Do not leave the floor wet for too long

Wooden floors are very sensitive to moisture. When the floor is exposed to water for a long time, the wood will absorb water, swell and deform, leading to warping, blistering, and gaps in the horizontal joints. Therefore, when cleaning wooden floors, we should only use a damp cloth and dry immediately, avoiding leaving water on the floor surface for too long.

In general, to avoid the situation of wooden floors having gaps/openings, choosing quality materials and proper construction techniques is very important. At the same time, users also need to preserve wooden floors properly, maintaining stable humidity in the living space will contribute to the durability of the floor and limit other problems during use.