Why Is My Vinyl Plank Flooring Separating?
Vinyl planks separate when the subfloor is uneven, the floor was not allowed to acclimate, or heat and sunlight have caused expansion and contraction.
Quick Answer
Vinyl planks separate (gaps appear at the click joints) for four common reasons: uneven subfloor flexing the click apart, no acclimation before install, direct sun heating the floor and forcing expansion, or furniture sliding that walks planks apart over time.
If the gap is hairline and seasonal, it is usually temperature-related and will close back up. If it is more than 1 mm and widening, the click joint has failed and the plank needs to be re-engaged.
Diagnose the Cause
- Gap appears in sun-blasted rooms first? Heat expansion. Add curtains or UV film, then close the gap manually.
- Gap appears after sliding furniture? Lift the furniture next time. Felt pads will not save click joints on plank flooring.
- Gap forms in the same spot every winter? Subfloor dip. Use a level to find the low point.
- Whole floor drifting apart? Likely installed too tight (no perimeter gap) and now contracting.
How to Close the Gap
- Pull the baseboard or quarter round on the closest wall.
- Place a tapping block against the plank end and tap with a rubber mallet toward the gap.
- Work plank-by-plank back to the wall until the gap closes.
- Re-set the baseboard.
Prevent It Next Time
- Acclimate. 48 hours in the room before install at 60 to 80°F.
- Flatten the subfloor. 3/16 inch over 10 feet maximum.
- Leave the expansion gap. 1/4 inch around the perimeter, every doorway, every pipe.
- Limit room size without transition. Most LVP needs a T-moulding every 30 to 40 feet of run.
Real-World Notes
Field experience matters more than spec sheets here. Installers who do this work week-in week-out will tell you the same things: the substrate is everything, the acclimation step is non-optional, and a single missed prep detail will show up six months later when the seasons change.
Climate also plays a bigger role than most homeowners expect. A floor that performs perfectly in coastal Florida might cup in dry Denver winters. Match the product to the climate zone, and your warranty terms to your actual indoor humidity range.
Insurance and resale considerations are worth a mention too. Document the install with photos, keep the receipts, and save the lot numbers. Future buyers ask, and future repairs need them. Separating vinyl plank flooring repair is a long-term decision, treat it like one.
One last note from the trade: cheap is rarely cheap. The lowest-priced product on the shelf usually has the thinnest wear layer, the loosest click, and the worst warranty terms. A mid-priced product from a known brand will outlast the budget option by 50 percent or more on average, which works out cheaper per year of service.
Frequently Asked Questions
Does the answer change for rental properties? The general guidance holds, but landlords usually optimise for durability over aesthetics, so they lean to the cheapest waterproof option that will survive turnover after turnover.
What about radiant heat? Always confirm your flooring choice is rated for radiant heat (most rigid-core LVP is, solid hardwood usually is not). Manufacturers publish a maximum subfloor temperature, typically 82°F (28°C).
How long should I let the materials sit before installing? 48 hours in the room of installation is the safe default for laminate and LVP. Engineered hardwood needs longer, often 7 to 14 days, until its moisture content is within 2 to 4 percent of the subfloor.
Does the same answer apply in the UK? Mostly yes. UK retailers like B&Q, Wickes and Carpetright sell the same product categories with similar specs, though pricing and brand names differ.
Pro Tips From the Trade
- Buy 10 percent extra. You will cut waste at every wall and inside every doorway. Pros budget 10 percent overage on rectangular rooms and 15 percent on rooms with diagonals or lots of cutouts.
- Keep a few planks aside. Future repairs need a colour and lot match. Stash at least one full carton in the garage or basement, ideally from the same production run.
- Photograph the install. Snap pictures of the subfloor, vapour barrier, expansion gaps, and any transitions before the baseboards go on. Warranty claims often hinge on documentation.
- Save the receipts and lot numbers. Almost every flooring warranty requires proof of purchase and the production lot to be honoured.
If you take just one thing from this guide, take this: prep work decides 80 percent of the outcome. Spending an extra hour on subfloor inspection, moisture testing, acclimation, and laying out a dry run pays back ten times over the life of the floor. Skipping prep to save an afternoon almost always costs a weekend later.
And when in doubt, call a flooring contractor for an hour-long paid consult. A pro walking your room will spot issues you might miss, and the fee is trivial compared to a botched install.
Bottom Line
Flooring decisions sit at the intersection of budget, lifestyle and resale value. Get the prep right (flat, dry, clean subfloor; correct underlayment; proper acclimation) and even a mid-priced product will look and perform like a premium one. Cut corners on prep and even the most expensive plank will telegraph every flaw underneath.