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Why Did My Laminate Floor Start Lifting After a Small Leak?

Last updated October 31, 2026

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The short answer

How Water Gets into Laminate

Laminate planks are made with a fiberboard core that acts like a sponge. When water sits on the surface or seeps through the joints, the core absorbs moisture and swells. This swelling pushes the planks upward, creating the lifting you see.

A small leak might not seem serious, but water can travel under the floor through gaps in the seams. Even a slow drip from a pipe, dishwasher, or ice maker can saturate the subfloor and wick moisture into the laminate from below. The result is the same: warped edges and raised sections.

  • Check for visible gaps between planks where water can enter
  • Look for dark spots or discoloration that signal trapped moisture
  • Feel for soft or spongy areas when you walk across the floor
  • Inspect nearby baseboards for staining or peeling paint
  • Note the date the leak started, as damage can show up later

Why Lifting Happens After the Leak

The fiberboard core expands when wet, but it does not return to its original shape after drying. That expansion is permanent. Once the core swells, the laminate surface has nowhere to go, so it lifts at the edges or buckles in the middle.

The delay between the leak and the lifting often confuses homeowners. Water can take time to travel through seams or soak into the subfloor. By the time you notice the floor rising, the moisture may have already caused lasting damage.

What to Do Right After a Leak

Act quickly to stop the water source. Turn off the supply valve to the appliance or pipe if you can find it safely. If you live in Fresno, keep your shutoff valve location written down, so you can reach it fast during a leak.

Remove standing water with towels or a wet vacuum. Lift any furniture or rugs off the laminate to let air circulate. Open windows or use fans to dry the area, but remember that laminate can still absorb moisture from below.

  • Turn off the water supply at the source
  • Blot up standing water immediately
  • Remove rugs, mats, and furniture from the wet area
  • Set up fans to speed up surface drying
  • Do not use heat, as it can warp the planks further
  • Call a professional if water has seeped under the floor

When to Call the Pros

If the laminate is already lifting, or if water has been present for more than a day, the pros can assess the extent of the damage. They use moisture meters to find hidden water in the subfloor and walls. They may also remove some planks to dry the area properly.

In many cases, the laminate itself cannot be saved. The pros often remove the damaged planks, dry the subfloor, and prepare the area for new flooring. They can also check for mold growth, which is a risk whenever moisture sits for long periods.

How to Prevent Future Lifting

Prevention starts with fixing leaks quickly and maintaining appliances. Check hoses and connections under sinks, dishwashers, and refrigerators regularly. A small drip today can become a swollen floor tomorrow.

If you replace your flooring, choose water-resistant laminate or use a moisture barrier underlayment. Keep the floor sealed at seams and edges. Also, wipe up spills immediately and avoid wet mopping, which can push water into the joints.

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Frequently asked questions

Can a small leak really cause this much damage?

Yes. Even a small leak can saturate the fiberboard core over time. The core swells and stays swollen, which lifts the planks. You may not see the damage until days later, but the moisture has already done its work.

Will the laminate flatten out once it dries?

No. Once the fiberboard core swells, it does not shrink back to its original shape. Drying stops further damage, but the lifting and buckling are usually permanent. Replacement is often the only fix.

Should I dry the floor myself or wait for a pro?

You can start drying the surface yourself, but if water has seeped under the floor, surface drying won't help. The pros have equipment to extract moisture from the subfloor and can determine if mold is a concern. Acting quickly matters.

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