There’s nothing more frustrating than walking across your laminate floor and noticing those annoying gaps between the planks. I’ve been there myself—what started as a minor cosmetic issue can quickly turn into a magnet for dust, crumbs, and even moisture damage if left unchecked. For DIYers and homeowners, knowing how to fix gaps in laminate flooring isn’t just about keeping your home looking sharp—it’s about protecting your investment and preventing bigger headaches down the line.
Laminate flooring is designed as a floating floor, meaning the planks expand and contract naturally with changes in temperature and humidity. Over time, this movement, combined with wear and tear or installation quirks, can create gaps that make your floor look unfinished and feel uneven. Ignoring them is like letting a small leak sink your ship—you want to nip it in the bud before it gets out of hand.
In this guide, I’ll walk you through everything I’ve learned from years of hands-on experience: from small, easy DIY fixes like filling minor gaps, to tackling larger separations with plank realignment or repair kits. Along the way, I’ll share tips, common mistakes to avoid, and preventative strategies to keep your laminate floor tight and flawless for years to come. Whether you’re a weekend warrior or a first-time DIYer, by the end of this guide, you’ll know exactly how to tackle those gaps without breaking the bank—or your sanity.
Common Causes of Gaps in Laminate Flooring
Understanding why gaps appear in laminate flooring is half the battle. In my experience, once you identify the root cause, fixing the gaps becomes much easier—and you can prevent them from popping up again. Here are the main culprits I’ve seen in homes and DIY projects:
Seasonal Temperature and Humidity Changes
Laminate is a floating floor, which means it naturally expands and contracts with changes in temperature and humidity. I remember one winter when the heat kicked in, and suddenly, the planks in my hallway had shrunk slightly, creating narrow gaps along the edges. In most cases, this is normal and not a sign of poor installation—but ignoring it can allow dust and debris to collect in those gaps. Using a humidifier in dry months or letting the floor acclimate before installation can make a world of difference.
Improper Installation
A lot of DIYers and even some professional installers make the mistake of not leaving the right expansion gap along the walls. I’ve seen floors installed tight against baseboards, only for the planks to buckle or leave gaps within weeks. Improper alignment of tongue-and-groove joints or an uneven subfloor can also contribute. Remember: measure twice, cut once. A little patience during installation saves a lot of headaches later.
H3: Subfloor Issues and Uneven Surfaces
Uneven or unstable subfloors are a hidden enemy. In one project, a slightly warped subfloor caused the laminate planks to separate over time, even though the installation was perfect. A level, stable surface is crucial; otherwise, the floor will move, creating gaps that grow larger over months or years.
Wear and Tear Over Time
Even perfectly installed floors aren’t immune to the effects of heavy foot traffic, shifting furniture, or foundation settling. I’ve had clients call me in panic over hallway gaps that appeared seemingly out of nowhere—but after inspection, it was simply natural aging combined with high-traffic stress. Regular inspection and maintenance can catch these issues before they turn into costly repairs.
How To Fix Small Gaps (Under 1/8 inch)
Small gaps in laminate flooring may seem minor, but if left unattended, they can collect dirt, moisture, and even cause the planks to warp over time. From my hands-on experience, tackling these small separations is usually straightforward and can save you a lot of grief down the line. Here are my go-to solutions for DIYers and homeowners.
Using Wood Filler or Putty
One of the simplest fixes is applying a laminate-appropriate wood filler or putty. I always match the filler color to the laminate planks—trust me, mismatched colors stick out like a sore thumb.
How I do it:
- Clean the gap thoroughly, removing dust and debris.
- Apply the filler with a putty knife, pressing it into the gap.
- Smooth the surface so it’s level with the plank.
- Let it dry, then gently sand if needed.
Tips: Don’t overfill—the filler can crack or peel if it’s too thick. Small gaps respond really well to this approach, and it’s a quick fix that looks professional without replacing any planks.
Rubber Mallet and Tapping Blocks
Sometimes, small gaps are simply due to planks shifting slightly out of place. In those cases, I reach for a rubber mallet and tapping block.
How I do it:
- Place the tapping block against the plank edge.
- Gently tap with the mallet, nudging the plank back toward the neighboring piece.
- Work slowly, checking the alignment as you go.
Caution: Avoid hitting too hard—damaging the tongue-and-groove edges is easy if you’re not careful. With a few gentle taps, you can close many small gaps without any filler at all.
Wax or Laminate Gap Filler Sticks
For cosmetic gaps or slightly larger hairline separations, wax sticks designed for laminate floors are a lifesaver. I keep a few in different colors around the house for quick touch-ups. Simply rub the wax into the gap, wipe off the excess, and you’ve got a clean, seamless finish.
Pro tip: These sticks aren’t a structural fix—they’re best for gaps that are more aesthetic than functional.
Fixing Larger Gaps (Over 1/8 inch)
Fixing larger gaps in laminate flooring requires a bit more patience and the right approach. These gaps usually appear due to poor installation, excessive floor movement, or damaged planks. From my experience, addressing them early prevents bigger headaches down the line.
Re-Aligning and Resetting Planks
Sometimes, the best solution is to gently lift the affected planks and realign them. I remember tackling a long hallway where the gaps had become noticeable over time. Here’s how I approached it: remove the baseboards carefully, lift the planks starting from the nearest wall, and reposition them so the tongue-and-groove joints fit snugly. Once aligned, replace the baseboards, and the floor looks as good as new. This method works best when the gap is caused by installation issues rather than damage.
Using Laminate Gap Repair Kits or Strips
For DIYers, laminate repair kits are a lifesaver. These kits usually include spacers, filler strips, or adhesive planks designed to close larger gaps. I’ve used them in several living rooms where planks had shifted after seasonal temperature changes. The process is straightforward: choose the strip matching your floor color, slide it into the gap, and secure it as directed. These kits save a lot of time compared to replacing multiple planks.
Adjusting Underlayment or Installing Shims
In some cases, the floor’s movement is caused by an uneven subfloor. Adding underlayment or thin shims beneath the laminate can reduce movement and prevent gaps from widening. I’ve had a client whose hallway floor constantly developed gaps; once we added a quality underlayment, the problem stopped. This technique is particularly useful for floating floors on uneven surfaces.
Replacing Damaged Planks
If the planks themselves are warped, cracked, or otherwise damaged, sometimes replacement is the only viable solution. I always keep a few extra planks from the original installation, which makes replacement much simpler. Remove the damaged plank carefully, clean the space, and insert the new one, making sure the tongue-and-groove locks perfectly. After replacement, reattach baseboards and the floor looks seamless.
Large gaps require more effort, but with the right tools and approach, they can be fixed effectively without compromising the overall integrity of your laminate floor. Acting quickly also prevents dirt and moisture from making the problem worse.
Preventing Future Gaps
Prevention is always better than cure, especially when it comes to laminate flooring. From my years of experience, floors that are properly maintained and monitored rarely develop troublesome gaps. Here are some practical ways to keep your laminate planks tight and flawless.
Proper Acclimation Before Installation
One of the biggest mistakes DIYers make is not letting laminate flooring acclimate to the room before installation. I always leave the planks in the room for at least 48 hours so they can adjust to the temperature and humidity. This small step can prevent seasonal expansion or contraction from causing gaps later on. Think of it as letting your floor “settle in” before moving furniture in—measure twice, cut once really applies here.
Maintaining Consistent Humidity Levels
Laminate floors are sensitive to moisture fluctuations. During dry winters, planks can shrink slightly, while excess humidity in summer can cause them to swell. I recommend using a humidifier in winter and wiping up spills promptly. Keeping your home’s humidity between 35–55% usually keeps laminate floors happy and gaps minimal.
Regular Floor Inspection and Maintenance
A quick walkthrough every few months can save a lot of headaches. I check for small separations, uneven planks, or lifting edges before they turn into bigger problems. Routine cleaning with a soft broom or microfiber mop also prevents debris from getting trapped in gaps, which can worsen over time.
Choosing Quality Laminate and Proper Installation Methods
Not all laminate flooring is created equal. Higher-quality planks with precise tongue-and-groove design resist separation better. If you’re installing yourself, take your time and follow manufacturer instructions carefully. If hiring a professional, make sure they’re experienced with floating floors—sometimes it’s worth paying a little extra to avoid recurring issues.
Common Mistakes to Avoid
Even the best-laid plans can go sideways if you make avoidable mistakes while installing or maintaining laminate flooring. From my experience, spotting these pitfalls early can save homeowners a lot of time, money, and frustration.
Ignoring Subfloor Problems
A wobbly or uneven subfloor is like building a house on sand—eventually, things will shift. I’ve seen DIYers install beautiful laminate floors, only to have gaps appear weeks later because the subfloor wasn’t level. Always check the surface with a level before laying down planks. Fixing minor uneven spots with leveling compound can prevent future separation.
Using Incompatible Repair Materials
Not all fillers, putties, or repair sticks are created equal. I once helped a client who had used regular wood putty on laminate; it cracked and flaked within days. Always choose products specifically designed for laminate flooring and try to match the plank color as closely as possible. It makes a world of difference in both durability and aesthetics.
Over-Tightening or Forcing Planks
When planks don’t fit perfectly, the temptation is to force them together. I’ve seen many DIYers tap too hard with a mallet, damaging the tongue-and-groove edges. The correct approach is gentle tapping and alignment, or using fillers and repair strips if needed. Remember, forcing planks is like trying to fit a square peg into a round hole—it usually ends badly.
Neglecting Seasonal Maintenance
Laminate floors respond to changes in humidity and temperature. Ignoring these seasonal fluctuations can allow minor gaps to grow. I always recommend checking floors in spring and winter, adjusting humidity if necessary, and performing small repairs before they escalate. Small preventive actions can save you from major repairs later.
Tools & Materials You’ll Need
Before you start fixing gaps in laminate flooring, it’s important to gather the right tools and materials. Having everything on hand not only makes the job smoother but also ensures a professional-looking result. From my experience, a little preparation goes a long way.
Essential DIY Tools
For most small to medium gap repairs, these tools are a must-have:
- Rubber mallet – for gently tapping planks back together.
- Tapping block – protects the edges of your laminate while aligning planks.
- Putty knife – perfect for applying wood filler or putty into gaps.
- Measuring tape – helps you gauge gap sizes accurately.
- Level – ensures your subfloor and planks are even.
I always keep these within arm’s reach when working on a floor project. Trust me, running back and forth for missing tools is the fastest way to lose momentum and patience.
Recommended Repair Materials
The right materials make all the difference in a lasting repair:
- Laminate wood filler or putty – ideal for small gaps under 1/8 inch.
- Laminate gap repair sticks or wax sticks – great for cosmetic touch-ups.
- Repair kits or filler strips – perfect for medium to larger gaps.
- Underlayment or shims – useful for reducing movement on uneven subfloors.
Color matching is key here. I’ve learned the hard way that even a tiny color mismatch can make the repair stick out like a sore thumb.
Optional Pro Tools for Large Jobs
For more extensive repairs or replacement jobs, consider having:
- Crowbar or plank puller – makes lifting planks easier.
- Replacement laminate planks – always keep a few extras from your original installation.
- Sandpaper or sanding block – for smoothing filler or putty.
Having these on hand means you can tackle any size gap efficiently and avoid multiple trips to the hardware store.
With the right tools and materials, even a DIYer can make gaps disappear and restore the floor to a polished, seamless look. Preparation is half the battle—once you have everything ready, the actual repair is much less intimidating.
Conclusion / Final Thoughts
Fixing gaps in laminate flooring doesn’t have to be a daunting task. From my years of hands-on experience, the key is understanding the cause of the gaps, having the right tools and materials, and taking a methodical approach to repairs. Whether you’re dealing with small hairline gaps or larger separations, there’s a solution that fits your skill level and budget.
For small gaps, wood filler, putty, or wax sticks often do the trick. Medium gaps respond well to tapping blocks, repair kits, or slight plank realignment. And for larger gaps or damaged planks, don’t hesitate to replace sections or adjust underlayment—sometimes a little extra effort upfront prevents recurring headaches.
Prevention is equally important. Acclimate your laminate before installation, maintain consistent humidity, and perform regular inspections to catch minor issues before they snowball. And always remember the golden rule I’ve learned over the years: measure twice, cut once, and don’t force anything that doesn’t fit. Little precautions go a long way.
Finally, avoid the common pitfalls—ignoring subfloor issues, using the wrong fillers, over-tapping planks, or neglecting seasonal maintenance. Take these lessons to heart, and you’ll keep your laminate floor looking smooth, seamless, and gap-free for years to come. By nipping small problems in the bud, you save both time and money while keeping your home beautiful.
With these tips, tools, and preventative strategies, you’re fully equipped to tackle any gaps in your laminate flooring like a pro—even as a DIYer.
