What Happens to Laminate Flooring When It Gets Wet?
Last updated October 25, 2026
The short answer
How Water Damages Laminate Planks
Laminate planks are layered materials pressed together. The top is a thin, hard wear layer with a printed image, sealed with resin. Under that is a dense fiberboard core. This core is very absorbent. When water reaches it, the fibers swell. The pressure from swelling pushes the planks apart and deforms their shape. The top layer may separate as the core expands, creating visible bubbles or peeling edges.
The damage starts at the seams and edges where water first enters. Once the core swells, the planks can no longer lie flat. They push against each other, causing buckling in the middle of the floor. The locking mechanisms along the plank edges become damaged and may not reconnect. This process can happen within hours, making the floor uneven and potentially unsafe to walk on.
Signs Your Laminate Floor Has Water Damage
Look for obvious changes in the floor's appearance. Planks may cup, where the edges rise higher than the center. You might see crowning, where the center of a plank is higher. Buckling creates large humps across multiple planks. Discoloration or dark water stains along seams are clear indicators. A musty smell can also signal moisture trapped underneath the flooring.
Feel the floor with your feet or hands. Damaged areas often feel soft or spongy when you walk. The floor might make a squishing sound if water is present underneath. Gaps can appear between the floor and the wall trim as the planks expand. These signs mean water has penetrated the core layer, and the structural integrity is compromised.
- Buckling or lifting planks that no longer lie flat.
- Visible swelling along the edges or seams between planks.
- A soft, spongy feeling when you walk on the floor.
- Discoloration, dark staining, or white watermarks on the surface.
- A persistent musty odor indicating moisture and potential mold.
- Gaps appearing at the baseboards as the floor expands.
Immediate Steps to Take After a Spill or Leak
Your first move is to stop the water source. Turn off the water supply to a broken appliance or shut the main valve. For a spill, wipe up all surface water immediately with towels. Move furniture and rugs off the wet area to allow air circulation. Use fans to increase airflow over the surface, but avoid heat sources that could warp the planks further.
Remove any standing water from the surface as fast as possible. Check if water has seeped into the subfloor by feeling nearby rooms. If you live in Nashville, keep your shutoff valve location written down for quick access. Do not use a wet vacuum unless it is designed for hard floors, as it might scratch the surface. The goal is to dry the top and edges before the core absorbs moisture.
When to Call for Professional Water Removal
Contact local water damage pros if the leak is large, comes from a contaminated source, or has soaked the subfloor. They have industrial extractors to pull water from seams and powerful dehumidifiers to dry the air and structure. They can also perform moisture mapping to find hidden dampness in walls or under flooring. This service is crucial for preventing mold growth in the building materials below.
A professional inspection determines if drying is possible or if replacement is necessary. The pros assess how much water the core absorbed and for how long. They check the subfloor and adjacent walls for saturation. If the laminate is severely swollen or the locking system is broken, drying may not restore it. Their assessment helps you understand the full scope of the damage.
Repair Options and Likely Outcomes
For minor, localized damage, you might replace individual planks. This requires leftover planks from the original installation and careful work to unlock and relay sections. Often, water damage affects a large area, making spot repairs ineffective. If the subfloor is also wet, it must be dried completely before any new flooring is installed. Wet subflooring can ruin new laminate and lead to mold problems.
Complete floor replacement is common after significant water exposure. Laminate flooring is generally not salvageable once the core is saturated. The cost for replacement varies widely. It often depends on the square footage, the cost of new materials, and the labor for removal and subfloor preparation. Policies vary, and your insurer decides what is covered. Discuss the damage with your insurance company to understand your options.
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Call Now (615) 436-5759Frequently asked questions
Can wet laminate flooring be dried and saved?
It depends on the water amount and exposure time. If only the surface is wet and dried quickly, it might be saved. Once the fiberboard core swells, the planks are usually permanently damaged. Warping and a compromised locking system mean replacement is the typical solution.
How long does it take for laminate to swell from water?
Swelling can begin within a few hours. The fiberboard core absorbs water rapidly. Visible warping or buckling often appears within 12 to 24 hours. The faster you remove the water and dry the area, the better the chance of minimizing damage.
Does water under laminate flooring cause mold?
Yes. Trapped moisture between the laminate and subfloor creates ideal conditions for mold growth. Mold can develop on the subfloor and the underside of the planks within 24 to 48 hours. This is why thorough drying or removal is critical for your home's air quality.