The short answer
What Causes the Waves
Laminate flooring has a fiberboard core that absorbs water. When moisture seeps in from a spill, a leaking pipe, or a flood, the core expands. That expansion makes the surface ripple or wave, especially along the seams. You might notice the effect first near walls, doorways, or under windows where water tends to collect.
High humidity can also cause waves, even without a direct leak. Indoor moisture levels can stay elevated in climates with wet winters. If the laminate was not acclimated before installation, it may react to normal humidity changes. The waves can appear gradually over weeks or suddenly after a water event.
- Spills left wet for hours
- Leaking pipes or appliances
- Flooding from heavy rain
- High indoor humidity
- Poor installation with gaps
- Wet mopping repeatedly
Check for Moisture Underneath
To find the cause, start by looking for visible signs of water: damp spots, stains, or a musty smell. Use a moisture meter if you have one to check the subfloor and the underside of the laminate. You can also feel for soft or spongy areas, which indicate the core has absorbed water.
If the waves are widespread, the moisture source might be beneath the flooring, like a slab leak or a plumbing issue. A water damage inspection can help locate hidden moisture. The pros use tools to map moisture levels without tearing up the whole floor.
- Look for water stains or discoloration
- Press down to feel for soft spots
- Use a moisture meter on seams
- Check the subfloor for dampness
- Inspect nearby walls for water marks
Dry Out the Area
Once you remove the water source, drying the floor is critical. Open windows, use fans, and run a dehumidifier to lower humidity. If the laminate is not too damaged, the waves may flatten as it dries. But if the core has swollen permanently, drying alone will not fix it.
For large water events, structural drying and dehumidification can speed up the process. The pros use industrial equipment to pull moisture from the subfloor and air. This helps prevent further swelling and reduces the risk of mold growth.
- Open windows for ventilation
- Run fans across the floor
- Use a dehumidifier in the room
- Remove wet baseboards or trim
- Lift a few planks to let air circulate
When to Replace the Floor
If the laminate has been wet for more than a day or two, the core likely will not recover. The planks can stay swollen, and the locking seams may break. In that case, you need to remove the damaged flooring. Water-damaged flooring removal involves taking out the affected planks and checking the subfloor for damage.
Replacement is often the practical choice. New laminate or a different flooring type can be installed once the subfloor is dry and level. The cost depends on the size of the area, the type of flooring you choose, and whether the subfloor needs repairs. You might spend a few hundred to a few thousand dollars, depending on your situation.
- Waves persist after drying
- Planks are soft or crumble
- Seams have separated
- Mold or mildew appears
- Subfloor is damaged
Prevent Future Waves
To avoid repeat issues, address leaks quickly and clean spills immediately. Use a damp mop rather than a wet one, and never allow standing water. In humid months, run a dehumidifier to keep indoor humidity below 50 percent. If you live in Redmond, keep your shutoff valve location written down so you can stop leaks fast.
Also, make sure the subfloor is dry before installing new flooring. A moisture barrier can help in areas prone to dampness. Regular checks under sinks and around appliances can catch small leaks before they reach the floor.
- Wipe spills right away
- Mop with a barely damp cloth
- Run a dehumidifier in summer
- Check under sinks for drips
- Inspect appliance hoses
Need help right now?
Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (425) 407-5186Frequently asked questions
Can I fix wavy laminate without replacing it?
Sometimes, if the moisture is caught early and the planks are not swollen badly. Dry the area thoroughly with fans and a dehumidifier. If the waves flatten, you might avoid replacement. But if the core has expanded, the floor will need new planks.
Why do the waves appear only near the seams?
Laminate seams are the weakest point. Water seeps through the gaps between planks and reaches the fiberboard core. The core swells at the edges, pushing the surface up. That makes the seams look raised and wavy. Seams near walls or doors are more exposed to moisture.
Will my insurance cover laminate floor damage?
Policies vary, and your insurer decides what is covered. Damage from a sudden leak or flood might be covered, but gradual damage from humidity often is not. Check your policy and talk to your insurance company about the specifics. You may need to document the damage with photos.