Why does laminate flooring buckle?

Laminate flooring is essentially a floating floor, meaning it is not glued to the subfloor. The panels have some room to move naturally to a certain extent. However, if there is not enough space around the edges of the floor, or if moisture comes into contact with the flooring, the panels may press against one another.

In such cases, the floor may bulge in the middle, become wavy, or even lift up at the seams.

1. There is no proper expansion joint

Laminate flooring may expand or contract to some extent in response to changes in temperature and humidity. Therefore, an adequate expansion gap must be provided between the flooring and the walls or other fixed structures.

If the floor is too close to the wall, the door frame, a pipe penetration, or any other fixed element, the panels will not be able to expand properly. This tension may eventually cause the floor to bulge in the middle.

• There isn't enough space next to the wall,
• The trim around the door frame is too tight,
• there isn't enough room to move around the pipes,
• Larger contiguous surfaces lack the necessary expansion joints.

2. Moisture has seeped under the laminate flooring

One of the most common problems with laminate flooring is inadequate moisture protection. Moisture from a subfloor with excessively high moisture content, a spilled liquid, water seepage, or even a hidden water leak can damage the flooring.

Laminate flooring contains wood-based materials that can swell when exposed to moisture. This can cause the joints to warp, the panels to come apart, or the flooring to bulge.

3. The moisture content of the substrate was too high

In the case of a new concrete or screed subfloor, it is particularly important that the subfloor be allowed to dry thoroughly before installation and that it meet the manufacturer’s specifications for the selected laminate flooring.

If the flooring is installed too soon, moisture rising from the subfloor can cause problems under the laminate flooring. Therefore, it is not enough to simply wait until the surface of the subfloor appears dry.

The proper moisture content must be checked using a suitable measurement method .

4. Humidity in the room is too high or too low

Laminate flooring may also react to changes in the room's humidity. In the event of persistently high humidity, wood-based materials may absorb moisture, while in very dry environments, dimensional changes in the opposite direction may occur.

Therefore, when installing laminate flooring, it is important to consider not only the condition of the subfloor but also the general conditions of the room.

5. An inappropriate shim was placed under the floor

The underlayment is an important part of a laminate flooring system. However, it does matter what thickness and properties the underlayment placed beneath the flooring has.

A underlay that is too soft or too thick is not necessarily a better solution. It can cause excessive movement under the laminate panels, which in the long run can put strain on the click joints.

When selecting underlayment, you should take into account, among other things, the subfloor, the floor heating system, and the manufacturer's specifications for the laminate flooring.

6. The floor is uneven

The subfloor beneath the laminate flooring must be level and stable. If there are significant differences in level, depressions, or protrusions in the subfloor, the load on the panels may become uneven.

Not only can this result in an uncomfortable, bouncy, or clattering walking surface, but it can also lead to increased wear on the joints.

If the subfloor is not suitable, it is advisable to make the necessary repairs or level the subfloor before installing the laminate flooring.

7. The unloading was not performed properly

When installing laminate flooring, several small details are important. For example, improperly designed expansion joints, faulty click joints, or installation that deviates from specifications can cause problems.

It is also important that the flooring be installed as specified by the manufacturer, especially in larger rooms, in cases of complex floor plans, or when underfloor heating is installed.

8. The floor cannot move because of heavy, fixed furniture

Floating laminate flooring needs some room to move. Therefore, it can be a problem if the flooring is held down by fixed structures that prevent it from moving naturally.

It is especially important to plan this in advance when dealing with built-in furniture, kitchen cabinets, fixed cabinets, or other heavy structures.

What should we do if the laminate flooring has already buckled?

As a first step, it’s a good idea to identify the cause of the problem. It’s not advisable to simply push back or secure the bulging part until you find out what caused the deformation.

It's worth checking:

• Is there adequate expansion space at the walls and fixed structures,
• whether water or other moisture has come into contact with the covering,
• whether the moisture content of the substrate was appropriate,
• Is the surface sufficiently level,
• Was a suitable underlay placed under the floor,
• Was the paving done properly?

If the panels have already become significantly deformed or damaged, it may be necessary to replace the affected panels. However, if the underlying cause persists, the new panels may also become damaged again.

Can a warped laminate floor be repaired?

It depends on what caused the problem and the extent of the damage. For example, if the floor buckled because there wasn’t enough space next to the wall, the floor may, in some cases, partially return to its original state once the underlying cause has been eliminated.

In cases of significant swelling caused by moisture or damaged snap-fit connections, however, it may be necessary to replace the affected panels.

How can you prevent laminate flooring from lifting and buckling?

• Lay the flooring on a properly prepared, level, and stable subfloor.
• Check the moisture content of the subfloor before laying the flooring.
• Choose the right underlayment for your laminate flooring.
• Follow the expansion specifications provided by the manufacturer.
• Pay attention to the gaps around walls, door frames, and pipe penetrations.
• Avoid prolonged exposure to moisture.
• We carry out the installation in accordance with the manufacturer's specifications for the specific flooring.

Summary

There are several possible causes for warped or bulging laminate flooring. The most common problems include inadequate expansion gaps, moisture, an improperly prepared subfloor, inadequate underlayment, and poor installation.

That is precisely why the durability of laminate flooring depends not only on the product chosen . Equally important are proper subfloor preparation, selecting the right underlayment, and professional installation.

If an existing laminate floor has already buckled or warped, it’s a good idea to identify the underlying cause before making repairs. This way, you can not only address the visible defect but also reduce the likelihood of further damage.