The short answer
Find the Water Source
The first step is to find where the water is coming from. Check the visible pipes under the sink for drips, corrosion, or loose connections. Look at the sink basin itself for cracks or gaps in the caulk along the counter edge. A small, steady leak can saturate the floor over weeks without you noticing.
Also check the dishwasher and refrigerator if they sit nearby, as their supply lines can leak behind the cabinets. If you have a garbage disposal, inspect the gasket where it meets the sink. Run water and watch for drips. If you cannot find the leak yourself, a plumber or a leak detection service can help pinpoint it.
If you live in Milwaukee, keep your shutoff valve location written down. Knowing how to stop the water flow quickly limits damage while you investigate.
- Look under the sink with a flashlight
- Feel pipes for wetness or corrosion
- Run water and watch for drips
- Check caulk and seals around the sink
- Inspect the dishwasher supply line
- Wipe down pipes and check again later
Dry Out the Floor
Once you stop the leak, drying the floor is critical. Buckling happens because wood absorbs water and swells. The longer the moisture sits, the more the boards warp and the subfloor deteriorates. Open cabinet doors and use fans to circulate air around the wet area.
A dehumidifier helps pull moisture from the air and the wood. If the water has soaked through to the subfloor, you may need professional drying equipment. Structural drying and dehumidification work involves heavy-duty machines that draw moisture out of wood and concrete. The process can take several days depending on how much water soaked in.
Do not try to force the boards flat by nailing or screwing them down while they are wet. That can split the wood or hide damage that continues underneath.
Assess the Damage
After the area is dry, check how far the damage extends. Look for discoloration, soft spots, or a musty smell. Press on the floor near the sink to feel if the subfloor is spongy. If only the surface is warped, you might be able to sand it down, but that is often a temporary fix.
If the subfloor is damaged, the flooring will need to be removed and replaced. Water-damaged flooring removal involves taking up the affected boards and checking the layer underneath. The pros can measure moisture levels with special tools to determine what is salvageable.
Consider a water damage inspection to map the full extent of the problem. This helps you understand whether the issue is isolated or if water has traveled along the subfloor to other areas.
Repair or Replace
Minor buckling from a one-time spill might relax as the wood dries, but a persistent leak usually causes permanent damage. If the flooring is laminate or engineered wood, it often cannot be reused once it swells. Solid hardwood may be sanded and refinished if the damage is shallow.
For serious cases, the pros will remove the damaged flooring and install new material. Floor replacement involves matching the new boards to your existing floor, which can be tricky if the original is discontinued. The subfloor also needs to be dry and level before new flooring goes down.
If the leak damaged the cabinets or drywall behind the sink, those repairs are separate. A water damage restoration professional can handle the whole process, from drying to rebuilding.
- Remove wet insulation or underlayment
- Dry the subfloor completely
- Replace rotted wood before new flooring
- Match new flooring to existing material
- Re-caulk around the sink after repair
- Check for mold growth during cleanup
Prevent Future Leaks
Once the floor is fixed, take steps to avoid a repeat. Tighten all plumbing connections, but do not overtighten and crack the fittings. Replace old supply lines with braided stainless steel hoses, which last longer than rubber. Re-apply caulk around the sink edge yearly to keep water from seeping under.
Watch for early warning signs like a damp cabinet base, a musty smell, or a slight change in the floor's feel. Catching a leak early saves you from a bigger repair. If you are unsure about the condition of your pipes, a plumber can do a routine check.
Keep the area around the sink dry by wiping up spills promptly. A small mat or tray under the sink can catch drips from the pipes before they reach the floor.
Water damage does not wait
Every hour counts once water gets into floors and walls. One call starts the response.
Call Now (414) 348-0250Frequently asked questions
Can I fix a buckled floor myself?
If the leak is stopped and the floor is only slightly warped, you might be able to sand it down and refinish it. But if the subfloor is wet or soft, you need to remove the flooring. That job is often the right one to leave to the pros.
How long does the floor take to dry out?
Drying time depends on how much water soaked in and the material. A small spill might dry in a few days with fans. A serious leak into the subfloor can take a week or more, especially with professional drying equipment.
Will my insurance cover this damage?
Policies vary, and your insurer decides what is covered. Water damage from a sudden leak is often covered, but gradual damage from a long-term leak might not be. Check your policy and talk to your insurance company about your specific situation.