Small gaps opening between your luxury vinyl planks can quickly ruin the smooth look of your room. You might suspect a manufacturing defect or assume the locking tabs snapped underfoot, but physical separation in luxury vinyl plank (LVP) usually stems from unlevel foundations or sudden shifts in indoor air conditions.
Finding the right solution starts with pinpointing whether your floor is reacting to humidity swings or resting on an uneven subfloor.
Environmental Shifts vs. Subfloor Imperfections
Luxury vinyl handles daily foot traffic well, but the planks still expand and contract with temperature and moisture changes. How and where the gaps appear narrows down the root cause.
Seasonal Gaps from Humidity Drops
During Minnesota winters, running your furnace continuously pulls moisture out of the air. When indoor humidity drops significantly, individual vinyl planks contract and shrink slightly. Because floating LVP floors lock together without glue, this shrinkage creates narrow, uniform gaps down long runs of planking.
If the gaps appear evenly across the entire room during cold months and close back up in humid summers, the floor is reacting normally to seasonal air changes. A whole-home humidifier or a consistent indoor climate usually solves the issue without physical repairs.
Structural Separation from Subfloor Dips
Wide gaps in one specific area—especially if the planks feel bouncy, hollow, or squishy underfoot—point to an issue underneath the floor. Floating LVP needs a flat, smooth foundation to stay interlocked.
Cold concrete basement slabs in New Brighton, Shoreview, and Mounds View split-level homes often develop minor low spots over time. In the 1960s to 1980s, two-story builds, plywood subfloors over floor joists, can sag near heavy traffic paths. When you step on a low spot in the subfloor, the vinyl planks flex downward under your weight. That continuous vertical movement puts extreme strain on the click-lock seams, eventually forcing the planks to unlatch and pull apart horizontally.
How a Professional Subfloor Assessment Finds the Cause
Kicking the planks back together or squeezing glue into the seams provides only a temporary band-aid. If the subfloor underneath is not flat, the planks will separate again as soon as you step across the room.
A thorough floor assessment pinpoints the exact cause of the separation so you can take the right action:
Subfloor Levelness Standards: Installers use long straightedges and laser levels to test the subfloor against manufacturer tolerances. Most floating LVP systems allow a maximum variance of 3/16 of an inch over a 10-foot span. Anything deeper creates enough vertical flex to break locking joints.
Surface Moisture Levels: Moisture vapor rising through a concrete slab warps planks and damages underlayment. Testing the slab ensures hidden moisture is not pushing the subfloor out of alignment.
Perimeter Expansion Space: Floating floors need a small gap along the perimeter walls, hidden under baseboards, so the entire floor can shift naturally. If the floor sits too tightly against a wall or door jamb, the planks buckle, pinch, and push adjacent seams apart.
Local Repairs vs. Full Plank Replacement
Once you know why the planks are moving, you can decide on the best path forward.
Simple Local Repairs
If the subfloor is flat and the locking joints stay intact, a local repair is simple. An installer removes the surrounding baseboards, taps your floating planks back into alignment, and resets the correct perimeter expansion space. If a small low spot exists in an isolated corner, our crew unclicks a section of the floor, pours a fast-setting self-leveling compound over the subfloor dip, and reinstalls your original planks once it cures.
Necessary Plank Replacement
Flexing on an unlevel floor for months often shears off or cracks the delicate plastic click-lock tabs on the edges of the planks. Once those locking channels break, individual boards can no longer hold a tight seam on their own. The damaged section of material must come out. We level the subfloor underneath with a patching compound or mechanical grinding before laying down fresh planks from our warehouse.
Get Expert Flooring Advice in New Brighton
You do not have to guess whether your floor needs a simple adjustment or a structural subfloor fix. Our team helps you evaluate what is happening beneath your floorboards so you can get your living space back in shape.
If you are dealing with separating planks or planning a new project, stop by our New Brighton warehouse showroom to look at durable LVP options, or contact us today to talk through your subfloor questions with a local specialist.
