Flooring Problem
Floating Vinyl Plank (LVP) Separating & Gapping
Why is my floating luxury vinyl plank flooring separating or gapping at the seams?
The Short Answer
What Causes Vinyl Plank Separating?
A floating LVP floor is one connected sheet of planks held only by their click-locks, resting on the subfloor, and it is designed to expand and contract as a unit with temperature. Separation happens when that movement is not managed: vinyl's thermal expansion is several times greater than wood's, so a warm, sunny floor grows, and if it is pinned at one edge — no perimeter gap, or trapped under a heavy cabinet — it pulls apart or unlocks somewhere else. Gaps are almost always a movement or installation problem, not a defective plank.
The consequence is that once a locking joint pulls apart or a plank rides up, walking on it worsens the gap and can chip the locking edge, so it rarely self-corrects. The durable fix is at the cause: restore the room-perimeter expansion space, free any pinned edge, and address a sun-heated or uneven subfloor. If the planks were never acclimated or the subfloor is out of flatness tolerance, re-locking the seam alone will not hold.
How to Recognize Vinyl Plank Separating
Hairline-to-finger-width gaps opening between planks, often mid-floor or along a sunny wall, sometimes with an edge that has popped up slightly or a plank that shifts underfoot.
Root Causes
Why Vinyl Plank Separating Happens
No or insufficient expansion gap
The floor needs clearance at every wall and fixed object; without it the sheet has nowhere to grow, so it buckles or unlocks (manufacturer installation specs).
Thermal expansion from heat and sun
Vinyl's coefficient of thermal expansion is roughly five times wood's, so direct sun or large temperature swings move the floor substantially, and sun-baked planks expand then leave gaps when they cool.
Skipped acclimation
Planks installed before adjusting to room temperature, typically 48 to 72 hours per the maker, keep moving afterward and open seams.
Pinned floor
Heavy furniture, kitchen islands, or cabinets set on top of a floating floor lock it in place, so the field moves away from the pin and separates elsewhere.
Subfloor not flat or not clean
Deviation beyond roughly 1/8 inch in 6 feet (per many LVP makers) or debris under the floor makes planks rock and unlock, and low spots let joints droop apart.
What You Can Check
- Check the perimeter: pull the base shoe or quarter-round and confirm there is an expansion gap at the walls; a floor tight to the wall is the classic cause.
- Correlate with sun and season: gaps that open in a sun lane or worsen in summer point to thermal movement.
- Look for a pin: note heavy furniture, islands, or transitions fastened down that trap the field in place.
- Straightedge the subfloor and press the seams: humps or hollows beyond the maker's flatness spec (often 1/8 inch in 6 feet) or a plank that rocks tells you the base, not the plank, is at fault.
Can It Be Saved? Repair vs. Replace
Seam simply slid apart with everything else correct: tap the planks back together with a suction cup and tapping block and add proper transitions — fine when the gap is a one-time shift and perimeter space is adequate.
Missing expansion gap: cut the flooring back at the walls to re-establish clearance, re-seat the field, and reinstall the base — the fix when the floor was installed tight.
Pinned by furniture or cabinets: relieve the pin (furniture rides on the floating field, cabinets should not sit on top of it), then re-close the seams; ongoing heavy loads may need the layout reconsidered.
Subfloor out of tolerance, chipped locking edges, or chronic sun buckling: pull the affected area, flatten the subfloor to spec, add UV film or shades for sun, replace planks with damaged locks, and relay — damaged click-edges will not re-lock reliably.
Prevention
How to Prevent Vinyl Plank Separating
- Leave the manufacturer-specified expansion gap at every wall and fixed object and use T-moldings at large spans and doorways per the install guide.
- Acclimate planks flat in the room for the maker's stated time (commonly 48 to 72 hours) and keep the HVAC running so post-install conditions match.
- Control solar heat gain on sun-exposed floors with UV or solar window film or shades to reduce the thermal swing that drives movement.
- Prep the subfloor to the maker's flatness tolerance (often 1/8 inch in 6 feet), clean of debris, and never stand heavy cabinets or islands on top of a floating floor.
Good to Know
Frequently Asked Questions
Can I just push the planks back together and be done?
If the only issue was a one-time slide and the floor still has proper expansion space, yes, re-seating the seam with a tapping block or suction cup can fix it. But if the gap comes back after you close it, something is still driving movement: no perimeter gap, a pinning piece of furniture, sun heat, or an uneven subfloor. Closing the seam without removing that cause just resets the clock.
How big an expansion gap does LVP actually need?
It varies by product and room size, so the honest answer is whatever your specific plank's installation sheet states — commonly around a quarter inch at the perimeter, sometimes more for large or sun-exposed rooms. The gap is hidden under baseboard or quarter-round, so leaving it costs you nothing visually. Undersizing or skipping it is the single most common reason floating LVP separates.
Is a gapping plank a product defect I can warranty?
Usually not. Most LVP warranties exclude problems caused by installation and site conditions — no expansion gap, skipped acclimation, an out-of-tolerance subfloor, or excessive heat — which is where separation almost always originates. Genuine locking-mechanism defects exist but are rare, and a good diagnosis honestly rules out the site causes first before blaming the plank.
Does Sacramento heat make LVP separate more?
It can, and it is worth taking seriously here. Our summer heat plus lots of west- and south-facing glass can push floor-surface temperatures up enough to expand vinyl noticeably, and sunrooms and slider-adjacent lanes are the usual trouble spots. Locally we stress a full perimeter expansion gap, running the AC during and after install, and UV or solar film on the sunniest windows so the floor does not cycle so hard.
Related
Keep Reading
Related pages: Flooring Problems, Flooring Materials, Wide Plank Installation, and American Walnut.
Think You Have Vinyl Plank Separating?
We'll inspect your floor, find the moisture or structural source, and tell you honestly whether it's a repair or a replacement. Call (916) 749-0272 for an assessment.