Why Is My Luxury Vinyl Plank Flooring Separating?

Why Is My Luxury Vinyl Plank Flooring Separating?

Luxury vinyl plank (LVP) flooring is popular for its durability and waterproof performance, but separation between planks is a common complaint. After decades of installing and inspecting LVP in Oklahoma homes, we help homeowners understand why planks separate and what to do about it.

What Causes LVP Separation?

LVP separation occurs when planks pull apart at the seams. The most common causes:

• Insufficient expansion gaps — flooring needs room to expand; without gaps, it buckles and separates.
• Improper locking — planks not fully engaged during installation.
• Temperature changes — LVP expands and contracts with temperature; extreme changes cause separation.
• Heavy furniture — heavy furniture pinning planks prevents natural movement.
• Subfloor unevenness — uneven subfloors cause planks to flex and separate at joints.
• Moisture — excessive moisture under LVP can cause subfloor issues that affect the floor above.
• Manufacturing defects — rare but possible; defective locking mechanisms.

Expansion Gaps and Temperature

LVP is a floating floor that expands and contracts with temperature changes:

• Expansion gap — manufacturers require a 1/4 to 3/8 inch expansion gap around the perimeter.
• Temperature range — most LVP is rated for 50°F to 85°F; extreme temperatures cause movement.
• Sunlight — direct sunlight heats flooring, causing expansion; shade causes contraction.
• HVAC — maintaining consistent temperature reduces movement.

Without proper expansion gaps, LVP has nowhere to move — it buckles, presses against walls, and separates at seams.

Improper Locking

LVP uses a click-lock system that must be fully engaged:

• Partial engagement — planks not clicked fully will separate under foot traffic.
• Angle errors — planks installed at the wrong angle may appear locked but are not.
• Debris in joints — dust or debris prevents full locking.
• Damaged edges — edges damaged during installation do not lock properly.

Heavy Furniture and Pinning

Heavy furniture can cause separation:

• Pinning planks — heavy furniture like kitchen islands or pianos pins planks and prevents movement.
• Uneven weight — furniture concentrated on one area compresses planks.
• Sliding furniture — dragging furniture damages locking mechanisms.
• Islands on floating floors — cabinets or islands should NOT be installed on top of floating LVP.

Flatness Requirements

Subfloor flatness is critical for LVP:

• Manufacturer standards — most manufacturers require subfloor flatness within 3/16 inch in 10 feet.
• Uneven subfloors — high spots cause planks to flex and separate; low spots cause planks to sink and separate.
• Subfloor preparation — grinding high spots and filling low spots is essential.
• Transitions — uneven transitions between rooms cause separation at doorways.

Moisture Issues

While LVP is waterproof, moisture under the floor causes problems:

• Concrete slab moisture — excessive moisture vapor from concrete slabs can affect the subfloor.
• Subfloor damage — moisture can damage wood subfloors, causing unevenness.
• Mold and mildew — trapped moisture under LVP can cause mold.
• Moisture testing — concrete slabs should be tested for moisture before LVP installation.

Manufacturing Defects

Manufacturing defects are rare but possible:

• Defective locking mechanism — edges that do not lock properly.
• Dimensional inconsistency — planks of different sizes or thicknesses.
• Wear layer delamination — separation of the wear layer from the core.
• Warranty claims — manufacturing defects are typically covered by warranty.

Common Causes Table

Cause	Symptom	Repair vs. Replacement
Insufficient expansion gap	Separation near walls; buckling	Reinstall with proper gaps
Improper locking	Random plank separation	Re-engage or replace planks
Temperature extremes	Seasonal separation	Control temperature; re-engage
Heavy furniture pinning	Separation near furniture	Move furniture; re-engage
Subfloor unevenness	Separation along uneven areas	Prepare subfloor; reinstall
Moisture	Separation with subfloor damage	Address moisture; reinstall
Manufacturing defect	Widespread separation	Warranty claim; replace

Distinguishing Between Causes

Multiple causes can produce similar symptoms. Here is how to distinguish:

• Separation near walls — likely insufficient expansion gap.
• Random separation throughout — likely improper locking or manufacturing defect.
• Separation near heavy furniture — furniture pinning.
• Separation along a line — subfloor unevenness or transition issue.
• Seasonal separation — temperature and humidity fluctuations.
• Widespread separation with subfloor damage — moisture issue.

Repair vs. Replacement

• Minor separation — planks can often be re-engaged without replacement.
• Damaged locking mechanisms — replace damaged planks.
• Systemic issues — if the entire floor was installed incorrectly, partial or full replacement may be needed.
• Manufacturing defects — file a warranty claim for replacement.
• Subfloor issues — the subfloor must be addressed before reinstalling LVP.

Oklahoma Considerations

Oklahoma's temperature extremes and foundation movement affect LVP:

• Temperature swings — Oklahoma's hot summers and cold winters cause LVP expansion and contraction.
• Foundation movement — expansive clay soils cause subfloor stress.
• Sun exposure — south-facing windows heat flooring and cause expansion.
• HVAC consistency — maintain consistent temperature to reduce movement.

Diagnostic Checklist

• Where is the separation located? (Near walls, random, near furniture?)
• Was the expansion gap maintained during installation?
• Is the subfloor flat within manufacturer tolerances?
• Are there temperature or humidity extremes?
• Is heavy furniture pinning the floor?
• Is there evidence of moisture under the floor?
• Was the LVP installed by a professional or DIY?

Key Takeaways

• Most LVP separation is caused by installation errors, not manufacturing defects.
• Insufficient expansion gaps and subfloor unevenness are the most common causes.
• LVP expands and contracts with temperature — maintain consistent HVAC.
• Heavy furniture and cabinets should not pin floating floors.
• Accurate diagnosis determines whether repair or replacement is appropriate.

Common Mistakes Homeowners Make

• Assuming separation is a manufacturing defect without checking installation.
• Not maintaining expansion gaps during installation.
• Placing heavy furniture or cabinets on floating floors.
• Not addressing subfloor unevenness before installation.
• Expecting warranty coverage for installation errors.

Questions to Ask Before Authorizing Repairs

• Has the root cause been identified?
• Is the separation caused by installation, environment, or manufacturing?
• Can individual planks be replaced, or is full replacement needed?
• Does the subfloor need preparation before reinstalling?
• Is there a warranty claim to file?

When to Contact a Flooring Inspector

Contact a certified flooring inspector if the cause is unclear, if the installer disputes the claim, or if a warranty claim is involved. Inspectors can determine whether separation is caused by installation, environment, or manufacturing.

Bottom Line

LVP separation is most often caused by installation errors — insufficient expansion gaps, subfloor unevenness, or improper locking — not manufacturing defects. Accurate diagnosis determines whether planks can be re-engaged, replaced individually, or require full replacement. Address the root cause before attempting repairs.

Related Articles

• Why Is My Floor Squeaking?
• Why Is My Floor Making Popping or Clicking Sounds?
• Can Damaged Flooring Be Repaired Instead of Replaced?
• How Can I Tell If My Flooring Was Installed Correctly?

Still unsure what's causing the problem? Visit your nearest Premier Carpet & Tile showroom to speak with an experienced flooring professional who can help evaluate your flooring and recommend the most appropriate solution.

Key considerations

• Most LVP separation is caused by installation errors, not manufacturing defects
• Insufficient expansion gaps and subfloor unevenness are the most common causes
• LVP expands and contracts with temperature — maintain consistent HVAC
• Heavy furniture and cabinets should not pin floating floors
• Accurate diagnosis determines whether repair or replacement is appropriate

A common misconception

Many homeowners assume LVP separation means the product is defective. In reality, most LVP separation is caused by installation errors — insufficient expansion gaps, uneven subfloors, or improper locking — not manufacturing defects.

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