Why Is My Laminate Flooring Bubbling at Seams?
Last updated October 26, 2026
The short answer
What Causes the Bubbling
Moisture is the main reason laminate seams bubble. Laminate planks have a fiberboard core that soaks up water like a sponge. When liquid sits on the surface or seeps through a damaged seam, the core expands and pushes the top layer upward. That creates the raised, bubbled look you see along the edges.
Common sources include spills that were not wiped up quickly, a leaking dishwasher or refrigerator, or a clogged AC drain line that overflows onto the floor. In humid climates like Daytona Beach, high indoor moisture can also soften the seams over time. Even a damp mop used too often can cause problems if water pools in the joints.
How to Check for Moisture
Before you plan any repair, you need to find where the water is coming from. Look for stains, discoloration, or a musty smell near the bubbled seams. Check the baseboards and walls for dampness, and inspect nearby appliances like the fridge or dishwasher for leaks. A moisture meter can help you confirm which areas are wet.
If the bubbling appeared after a heavy rain or a flood, the source may be outside the home. In that case, the problem could be bigger than the floor itself. You may want a water damage inspection to trace the moisture and see how far it has spread. Knowing the source helps you decide whether a simple dry-out will work.
- Wipe up spills immediately with a dry cloth
- Use a fan or dehumidifier to dry damp areas
- Check under sinks and around appliances for leaks
- Avoid wet mopping laminate floors
- Look for gaps or lifting at the seams
Can You Repair a Bubbled Seam
Sometimes a small bubble can be flattened if the core is not too swollen. You can try placing a warm iron over a damp cloth on the seam for a few seconds, but this only works if the moisture has dried out completely. If the plank is still wet, the bubble will return or get worse.
If the swelling is severe or the surface is cracked, the plank usually needs to be replaced. Laminate floors are not designed to be sanded or refinished like hardwood. You may be able to swap out just the damaged planks if you have spare pieces from the original installation. Otherwise, a larger section of flooring may need to come up.
When to Call the Pros
If the bubbling covers a large area or the floor feels soft underfoot, the damage may go deeper than the surface. Water can seep under the flooring and affect the subfloor, which can lead to mold growth and structural issues. In that case, water-damaged flooring removal is often necessary to inspect what is underneath.
The pros can dry out the area properly and determine which planks are salvageable. They also have equipment to detect hidden moisture in walls and subfloors. If the water came from a flood or a burst pipe, the cleanup process involves more than just the floor. Acting quickly reduces the chance of long-term problems like mold.
Preventing Future Seam Bubbles
A sensible way to avoid bubbling is to keep laminate dry. Wipe up spills right away and use a barely damp mop for cleaning. Place mats at entrances and under pet bowls to catch drips. In humid months, a dehumidifier can help keep indoor moisture levels down, especially in coastal areas like Daytona Beach.
Check the seals around your dishwasher, fridge, and washing machine regularly. A small leak can go unnoticed for weeks and cause serious swelling. If you live in a flood-prone area, consider elevating appliances or installing a water alarm near the floor. Staying alert to changes in the seams helps you catch problems early.
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Call Now (386) 272-5697Frequently asked questions
Can I fix a bubbled seam myself?
You can try drying the area and applying gentle heat with an iron over a cloth, but it only works if the core has not swollen too much. If the bubble stays or the plank is cracked, you will need to replace the damaged plank. Otherwise, the pros can help with larger areas.
Will the bubble go away on its own?
No, the bubble will not disappear. Once the fiberboard core swells, it stays swollen even after drying. Drying the floor may stop it from getting worse, but the visible bump usually remains. Replacement is the only reliable fix for a permanent bubble.
How do I know if water got under the floor?
Look for a musty smell, soft spots when you walk, or discoloration along the seams. You can also lift a corner of the flooring if possible to check the subfloor. A moisture meter can give you a clearer answer. If you suspect hidden water, a professional inspection is a good idea.