Luxury vinyl plank (LVP) flooring is prized for durability, moisture resistance, and the ease of a floating installation. When planks start separating, it can reveal underlying issues with installation, climate, moisture, or subfloor conditions. Understanding the root causes helps homeowners decide whether reseating, replacing damaged boards, or professional remediation is required. This article explains common causes, diagnostic steps, and practical fixes to restore a seamless, long-lasting floor.
Common Causes Of Luxury Vinyl Plank Separation
Separation in LVP typically happens along the edges or seams where boards meet. The most frequent culprits are improper acclimation, inadequate expansion gaps, and movement from temperature or moisture changes. Misaligned tongues and grooves, or boards that were not fully clicked into place during installation, can also leave gaps that grow over time. In many homes, a combination of factors creates visible separation rather than a single issue.
- Expansion and contraction driven by temperature swings or seasonal humidity changes.
- Insufficient expansion gaps around the room perimeter or near fixed objects like cabinets.
- Inadequate acclimation of the flooring to room conditions before installation.
- Subfloor imperfections such as unevenness or moisture pockets beneath the laminate.
- Moisture intrusion from spills, leaks, or high humidity that affects the adhesive or substrate, even with floating floors.
| Issue | Impact | Typical Fix |
|---|---|---|
| Expansion gaps too small | Boards push against each other, causing buckling or gaps along edges | Reopen the perimeter, install proper spacing, and reseat boards |
| Improper acclimation | Boards expand or contract after installation | Ensure proper room acclimation per manufacturer guidelines |
| Moisture under subfloor | Delamination or edge lifting | Address moisture source, dry area, and replace affected boards |
Temperature And Humidity Factors
Home climates in the United States vary widely, and seasonal temperature shifts can drive noticeable expansion and contraction in LVP. In areas with high summer heat or cold snaps, the floor can move enough to reveal seams that had been barely visible. Humidity also plays a critical role; moisture absorbed by certain substrates or underlayment can cause edges to rise or boards to separate. Maintaining stable indoor conditions helps protect the floor’s integrity over time.
Preventive steps include using a dehumidifier in humid climates and a humidistat in moisture-prone rooms like kitchens, basements, or laundry spaces. Avoid placing LVP in areas with direct sun exposure without UV-protective window treatments, as ultraviolet rays can accelerate material expansion in some products. Manufacturers’ recommendations on climate range should be followed closely to keep warranties valid.
Subfloor And Installation Issues
Problems beneath the visible surface often drive separation. An uneven subfloor, slab moisture, or residual adhesive from previous floors can prevent a smooth click or glue-down bond. If the subfloor was not properly prepared, a high spot or low spot can push boards apart or cause gaps to form as the floor settles. In addition, using the wrong underlayment or skipping acclimation steps can compromise joint integrity and long-term performance.
In many cases, a simple inspection of the subfloor reveals the culprit. Look for soft spots, staining, or bubbling that indicates moisture accumulation. If the room’s base perimeter has too-tight a seam, or if a plank has not fully engaged its locking mechanism, reseating may restore a tight appearance. For concrete subfloors, a moisture barrier and proper acclimation are especially crucial to prevent final-day separation.
Water Damage And Moisture
Water intrusion is a frequent cause of LVP separation. Small leaks under sinks, around appliances, or from plumbing can soak the subfloor and underlayment, weakening the floor’s support and allowing edges to lift. Even in dry-looking rooms, rising damp in basements or crawl spaces can affect floating floors. Persistent moisture can also cause swelling at the plank edges, creating visible separations that persist until the moisture source is eliminated and the material dries out.
Address any signs of water damage promptly. Dry any affected areas completely, then evaluate whether the separated planks can be reseated or require replacement. If mold or mildew is present, remediation may be necessary before repairing the floor. For water-related damage, ensuring a dry, stable environment is essential to prevent reoccurrence of separation.
How To Diagnose And Fix
Diagnosing separation involves a systematic check of installation, environment, and condition of the planks and subfloor. Start by inspecting the edges of the separated boards to determine if the tongue-and-groove joints are still intact. Check for gaps along the room perimeter and near fixed objects. Confirm there is adequate expansion space by measuring the gaps at multiple walls. Test the room’s humidity and surface moisture with a moisture meter or manufacturer-approved methods to assess substrate conditions. If damage is widespread, replacement of affected boards may be necessary.
- Identify whether the separation is at the edge of a wall, near a doorway, or across multiple boards.
- Check if boards can be reseated by gently tapping with a mallet and using a scrap block to avoid damage.
- Verify that the room has proper expansion gaps per manufacturer instructions; if not, restore gaps and re-install.
- Assess acclimation by confirming the flooring was stored and acclimated in the room for the recommended period.
- Test subfloor moisture and ambient humidity; address any excessive moisture before proceeding.
- For glue-down LVP, inspect adhesive integrity; for floating floors, ensure joints are properly locked and replace any damaged planks.
If DIY attempts do not restore a tight fit or if extensive separation occurs, professional assessment is recommended. A contractor can evaluate substrate moisture, verify product compatibility, and replace affected areas without compromising the entire floor. For warranties, preserve original materials and receipts, and document the findings of moisture tests and installation details.
Preventive Tips For Future Installations
Prevention reduces the likelihood of future separation and helps keep LVP looking seamless. Begin with careful product selection that matches climate and subfloor type. Use the recommended underlayment for floating floors and follow the manufacturer’s installation guidelines precisely. Acclimate the flooring to room conditions for the recommended duration, typically 48 to 72 hours, before installation. Maintain consistent indoor temperatures and humidity levels to minimize movement after installation.
- Leave expansion gaps of at least the manufacturer’s minimum around the room perimeter.
- Acclimate the flooring in the installation space before cutting or clicking planks together.
- Address any moisture issues in the subfloor or room before installation.
- Use an appropriate underlayment and avoid penetrating the vapor barrier unless advised by the product guidelines.
- Limit direct sun exposure with UV-protective window treatments to reduce heat-driven movement.
When To Call A Professional
Consult a flooring professional if separation is extensive, if moisture concerns persist after remediation, or if there is visible damage to the substrate. A pro can perform a thorough moisture assessment, verify subfloor integrity, and determine whether board replacement, subfloor repair, or adhesive reapplication is necessary. In some cases, the floor may be eligible for warranty service, provided installation and environmental conditions align with manufacturer requirements.