Why Has My Laminate Flooring Bulged

Recognize The Symptoms And Immediate Signs

Moisture And Water Exposure

Improper Acclimation And Expansion Gaps

Underlayment And Subfloor Conditions

Temperature And Humidity Fluctuations

Installation Quality And Material Defects

Diagnostic Steps To Identify The Cause

• Inspect for visible water sources: leaks, spills, or damp under furniture.
• Check humidity levels with a hygrometer; aim for 30-50% relative humidity.
• Look for uneven subfloor or high spots using a straightedge or level.
• Feel for warmth or moisture behind the baseboards at bulged sections.
• Assess installation details: was there an adequate expansion gap and proper acclimation?
• Test for air leaks around plumbing penetrations or vents that could introduce moisture.

What To Do About A Bulged Laminate Floor

• Address moisture first: Locate and repair leaks, clean spills promptly, and dry the area thoroughly. Use dehumidifiers in humid climates to reduce moisture levels.
• Remove moisture-trapped sections: In severe bulging, affected planks may need to be replaced. Carefully lift the baseboard, remove the bulged boards, and replace with matching planks after confirming the subfloor is dry.
• Improve ventilation and climate control: Maintain consistent humidity and temperature to prevent recurrence.
• Check and enhance installation gaps: Ensure expansion gaps are present and unobstructed. Reinstall baseboards after adjustments to preserve a clean look.
• Evaluate underlayment: If moisture has affected the underlayment, replace it with a proper moisture barrier and allow the subfloor to dry before reinstallation.
• Consult a professional for significant damage: Persistent bulging over large areas may require a professional assessment to prevent subfloor damage and ensure structural integrity.

Prevention Tips To Minimize Future Bulging

• Choose laminate products with water resistance or waterproof cores for moisture-prone areas.
• Acclimate flooring in the installation environment for 48 to 72 hours, as recommended by the manufacturer.
• Maintain a stable indoor environment: avoid rapid humidity swings and use a humidifier or dehumidifier as needed.
• Use protective measures around water sources: seal bathrooms and kitchens, and promptly clean spills.
• Ensure proper installation: follow manufacturer guidelines for expansion gaps, locking systems, and subfloor preparation.
• Inspect for leaks regularly, especially in bathrooms, basements, and laundry rooms.

Choosing The Right Repair Path

Frequently Overlooked Considerations