Last Updated on November 17, 2025 by Jeff Cappon

How to Fix Laminate Flooring: Identify the Cause and Repair It Right

Whether you installed it yourself or hired a pro, nothing is more frustrating than seeing your new laminate start to lift or buckle. The good news: when you understand the root cause, you can fix laminate flooring efficiently—and keep the problem from coming back.

This guide covers the most common causes (moisture, installation errors, uneven subfloors, and missing expansion gaps) and shows you the right way to repair each one. If you’d rather skip the trial-and-error, our team at GC Flooring Pros can inspect, diagnose, and repair or replace damaged sections for a long-lasting, seamless finish.

Why Is My Laminate Floor Lifting?

“Lifting” isn’t a single problem, it’s a symptom. Pinpoint the cause first, then choose the matching fix below.

1) Underlying Moisture Problem

Excess moisture in the subfloor or slab causes planks to swell and rise. If substrate moisture is above about 6–9% per NALFA guidance, acclimation alone won’t save the install. Dehumidify, correct leaks, and use proper vapor barriers/underlayments before re-laying.

To reduce future risk, select an appropriate underlayment and verify moisture levels with a reliable moisture test prior to installation. You can also review general indoor moisture control tips from the EPA’s moisture guidance.

2) Not Properly Installed

Laminate relies on precise joints and “floating” clearances. If click-lock seams aren’t fully engaged, you’ll see gaps and peaks. If planks are jammed tight to walls, seasonal expansion has nowhere to go—leading to buckling. And if material wasn’t acclimated to site conditions, post-install movement is likely.

When in doubt, have a pro evaluate the locking profile, acclimation timeline, and edge clearances. Our crew at GC Flooring Pros can quickly spot and correct these issues.

3) Uneven Subfloor

Waves, dips, or humps telegraph through floating floors, creating bounce or lift. Minor highs can be ground; lows can be filled. If the slab or wood subfloor is significantly out of spec, a self-leveling compound or structural remediation may be required. Here’s a helpful primer on identifying issues with uneven substrates: how to address a wavy subfloor.

4) No Expansion Gaps

Floating floors need room to move—typically ~1/4″ around all fixed verticals (walls, cabinets, pipes, hearths). Without proper gaps and transitions, the floor will push against restraints and peak. This often appears at doorways or long runs.

How to Fix Laminate Flooring That’s Lifting

Match your repair to the underlying cause. Here are the proven approaches our technicians use in the field.

Fix 1: Level an Uneven Subfloor

1. Remove affected planks carefully and set them aside.
2. Identify highs/lows in the substrate. Grind down peaks; fill dips with an appropriate patch or self-leveler per manufacturer instructions.
3. Vacuum thoroughly; confirm smoothness with a straightedge.
4. Install the correct underlayment to absorb micro-variations and reduce sound transmission.
5. Reinstall planks, tapping joints with a block and mallet to fully lock the profile.

If the surface is severely out of tolerance, schedule a professional inspection through our Contact page, we’ll advise the most efficient, code-compliant fix.

Fix 2: Resolve Moisture Intrusion

1. Track down the source: plumbing leaks, slab moisture, or ambient humidity. Reference the EPA’s moisture control basics to stabilize indoor conditions.
2. Remove swollen/damaged planks and let the area dry thoroughly (fans/dehumidifiers as needed).
3. Test the slab or subfloor with a moisture meter or calcium chloride/ RH test to verify acceptable levels.
4. Install a vapor barrier/appropriate underlayment before relaying planks. Replace any damaged boards with matching stock.

Need help sourcing like-for-like replacements or confirming moisture thresholds? Our laminate specialists can assist: Laminate Flooring Supply.

Fix 3: Add or Restore Expansion Gaps

1. Remove trim/baseboards to inspect perimeter clearances.
2. Undercut or trim planks to achieve continuous ~1/4″ gap at all walls and fixed obstructions.
3. Introduce T-moldings or reducers at long runs, room transitions, and thresholds to break up expansive spans.
4. Reinstall base/quarter-round (never pinning the floating floor).

Fix 4: Reseat Mislocked Joints

1. Lift the row with gaps; inspect the click profile for damage or debris.
2. Clean tongues/grooves; replace any crushed or chipped boards.
3. Reassemble carefully, using a pull bar at end joints and a tapping block along long joints to fully engage.

Pro tip: Always follow the manufacturer’s installation pattern and expansion rules. If the original product line is discontinued, we can recommend visually compatible replacements through our laminate suggestions..

Prevention: Keep Your Laminate Flat and Beautiful

• Acclimate properly: Store unopened cartons in the space for 48–72 hours per manufacturer guidance.
• Control humidity: Keep indoor RH within the recommended range (often ~35–55%).
• Test substrates: Verify moisture before install (see NALFA installation guidelines).
• Honor expansion: Maintain perimeter gaps and use transitions on long runs.
• Choose the right underlayment: Moisture barriers for slabs; sound and minor-deflection control for upper floors.

When to Call a Professional

If lifting involves widespread moisture intrusion, significant leveling, or you can’t identify the root cause, bringing in a specialist will save time, material, and headaches. We’ll assess the floor, measure moisture, check flatness, and provide a clear plan—repair where possible, replace where necessary.

Ready for expert help? Schedule a Free In-Home Estimate or contact our team for prompt diagnostics and a durable, warrantied fix.