LVP Floor Gaps: Why They Happen and When They’re a Problem

Key Takeaways

  • Small seasonal gaps that open in winter and close in spring are normal behavior for LVP in the Western NC climate
  • Gaps that persist year-round, grow larger over time, or appear within the first few months of installation signal a real problem
  • The most common gap causes are low indoor humidity, insufficient acclimation before install, and installation errors
  • Gaps wider than 1/16 inch that persist beyond a season warrant professional assessment
  • Humidity management is both the main prevention and the first response for seasonal gapping

Gaps between LVP flooring planks generate more homeowner concern than almost any other floor issue, and a significant portion of the time, those gaps are entirely normal. LVP is a dimensional material that responds to its environment. In Western North Carolina’s climate, with its pronounced seasonal humidity swings, some degree of seasonal movement is expected in nearly every installation.

The skill is knowing the difference between normal seasonal behavior and a gap that signals something worth fixing.

Why LVP Develops Gaps: The Physics

LVP planks contain vinyl composite materials that are slightly hygroscopic, meaning they respond to the ambient moisture content in the air. In dry conditions, the material contracts very slightly in the cross-grain direction (width of the plank). When planks contract slightly, the click-lock joints between them develop a small space.

This is designed behavior. LVP products are engineered with this dimensional movement in mind. The click-lock joint system accommodates small movement without failing. The expansion gap left around the room perimeter during installation exists precisely to give the floor room to move without pushing against walls when it expands in humid conditions.

The problem arises when movement exceeds the designed range, either because humidity drops well below the normal maintenance range (below 30%) for a sustained period, or because installation issues didn’t allow the floor to start from the right equilibrium dimension.

Normal Gap Behavior vs. Problem Gaps

Normal seasonal gaps:

  • Appear in late fall through winter as indoor heating drops humidity
  • Are small, typically hairline to 1/32 inch wide
  • Close again as humidity rises in spring without any intervention
  • Appear consistently year to year in the same general pattern
  • Are accompanied by no other symptoms (no noise, no lifting, no soft spots)

In the Asheville and Hendersonville area, where mountain homes often run wood stoves or forced-air heating through long, cold winters, seasonal gapping is common. Our post on seasonal temperature changes and your floors explains the Western NC climate context for floor movement.

Problem gaps:

  • Present year-round regardless of season
  • Wider than 1/16 inch (enough to catch a fingernail or trap visible debris)
  • Growing wider over time rather than cycling seasonally
  • Appearing within the first few months of installation
  • Accompanied by noise, lifting, or soft spots underfoot

Cause 1: Low Indoor Humidity

Low humidity is the most common cause of gap development. When indoor relative humidity drops below 35%, LVP contracts more than its normal seasonal range accommodates, and gaps become visible.

In Western NC homes, this primarily happens during:

  • Winter heating season, when forced-air systems or wood stoves run continuously
  • Extended dry stretches in any season
  • Homes with very tight insulation that concentrates heat dryness

Response: Bring indoor humidity back into the 35 to 65% target range. A whole-home humidifier connected to the HVAC system, or portable console humidifiers in primary living areas, addresses the condition. Once humidity normalizes, seasonal gaps typically close within days to weeks.

Our article on humidity and LVP flooring in Western NC covers the specific humidity management challenges and tools for the mountain climate.

Cause 2: Insufficient Acclimation Before Installation

LVP planks must acclimate in the installation environment for 24 to 48 hours before they’re installed. During this period, planks reach equilibrium with the room’s temperature and humidity. If planks are installed without adequate acclimation, they’re placed at a dimension that may not reflect the room’s typical conditions.

Scenario: Planks are stored in a humid warehouse, then installed in a dry winter home without acclimation. The planks installed at their humid-expanded dimension will contract to their equilibrium state in the dry home, developing gaps as they do. These gaps appear within weeks of installation and don’t follow a seasonal pattern.

This is an installation error. If gaps appeared within the first few months of a new installation, document them and contact the installer about the workmanship warranty. Leicester Flooring’s lifetime installation warranty covers acclimation-related installation errors. For installations our team completed, contact us to discuss.

The full professional installation process our team follows, including acclimation protocols, is outlined on our vinyl installation page.

Cause 3: Installation Direction and Subfloor Irregularity

Gaps that appear in specific areas or along specific seam lines, rather than uniformly across the room, sometimes trace to subfloor irregularities or installation direction choices.

Subfloor high spots: An uneven subfloor with high spots causes planks to bridge across them at installation. Over time, as the floor flexes underfoot, click-lock joints in the bridged areas can separate and develop gaps. These gaps are localized to the bridging area and don’t follow seasonal patterns.

Installation direction relative to light: This sounds minor but affects gap visibility significantly. Gaps between planks installed parallel to primary light sources (windows, doorways) are much more visible than gaps in the same floor installed perpendicular to light. This isn’t a structural issue but affects how gaps are perceived.

Cause 4: Failed Click-Lock Joints

Click-lock LVP joints can fail if:

  • Excessive lateral force was applied during the contraction phase
  • The joint was never fully engaged at installation
  • Debris is trapped in the joint preventing full closure
  • The joint sustained impact damage

Failed joints don’t close when humidity rises. They stay at the gap position regardless of season. If gaps near a specific area don’t close in spring when surrounding areas do, a joint failure in that section is likely.

Individual failed joints in floating click-lock installations can sometimes be addressed by a flooring professional who can disengage and re-engage the joint. In some cases, the plank needs to be removed, inspected, and reinstalled.

When Gaps Become a Maintenance or Hygiene Issue

Gaps that are wide enough to collect debris, pet hair, food crumbs, or liquid become a cleaning challenge and, in the case of liquid, a potential moisture intrusion risk. Standard mopping won’t clean material that’s fallen into gaps. If gaps in your floor are consistently collecting debris, that’s a functional problem worth addressing regardless of the cause.

For persistent wide gaps in a floating floor, a professional can sometimes close them by removing a section of planks, pulling the field of the floor toward the wall, and reinstalling with proper gap closure. This is more feasible in smaller rooms and in installations that are relatively recent.

Key Takeaways: Bottom Summary

Seasonal gaps in LVP flooring are common and normal in Western NC’s climate, appearing in dry heating months and closing in more humid seasons. The threshold for concern is gaps that are wide (more than 1/16 inch), persistent year-round, growing larger, or accompanied by other symptoms. The first response to seasonal gapping is always humidity management. Gaps that appeared soon after installation or that don’t follow seasonal patterns point to installation issues worth discussing with the installer. For help diagnosing what’s happening with your floor, visit our Asheville showroom or Hendersonville location or reach out to our team.

Frequently Asked Questions

Are small gaps between LVP planks normal?

Yes, within limits. Hairline to 1/32 inch gaps that appear seasonally and close again are within normal behavior for LVP in climates with humidity variation. Persistent, widening, or large gaps are not normal and warrant investigation.

Can I fill LVP floor gaps with caulk or filler?

No. Filling gaps with a rigid material prevents the floor from moving back to its normal dimension when humidity rises. The filled gap turns into a lifted area as the floor tries to expand. Let seasonal gaps close naturally with humidity management. For structural gaps from joint failure, the solution is joint re-engagement or plank replacement, not filling.

My LVP floor has gaps everywhere after the first winter. Is this a defective product?

Not necessarily. If the gaps are seasonal and close in spring, this is the floor responding to low winter humidity. Bring indoor humidity into the 35 to 65% range. If the gaps are persistent or appeared within weeks of installation, contact the installer about acclimation protocols.

What’s the maximum acceptable gap size in LVP flooring?

Most flooring professionals consider gaps up to 1/32 inch to be within normal movement tolerance for floating LVP. Gaps visible from standing height and wide enough to catch fingernails or trap debris are outside normal range and worth investigating.