Why is my laminate flooring buckling?

Laminate flooring buckling is almost always caused by moisture issues or improper installation, with the most common culprit being water infiltration that causes the planks to expand beyond their normal limits.

Moisture is the primary enemy of laminate flooring. When water gets underneath the planks or seeps through gaps, the fiberboard core swells and pushes the planks upward, creating that characteristic buckling or peaking effect. This can happen from spills that weren't cleaned up quickly, humidity changes, plumbing leaks, or moisture wicking up from the subfloor. In Ottawa's climate, seasonal humidity swings between our dry winters (thanks to heating systems) and humid summers can exacerbate this problem, especially in basements where moisture control is already challenging.

Installation issues are the second major cause. If your flooring wasn't given proper expansion gaps around the perimeter (typically 1/4" to 3/8"), the planks have nowhere to go when they naturally expand and contract. This forces them to buckle upward. Similarly, if the subfloor wasn't properly prepared - meaning it was uneven, had moisture issues, or lacked proper underlayment - buckling becomes almost inevitable. Many DIY installations skip the crucial step of checking subfloor moisture levels with a moisture meter before installation.

In Ottawa homes, basement installations are particularly susceptible because concrete slabs can wick moisture upward, especially in older homes without proper vapor barriers. Our freeze-thaw cycles can also create foundation settling that affects subfloor levelness over time. If your buckling is happening in a basement, there's likely a moisture infiltration issue that needs addressing before any flooring repair.

For immediate assessment, check if the buckling feels spongy (indicating water damage to the core) or if it's rigid (likely expansion issues). Look for water sources - check around toilets, under sinks, near exterior walls, or basement areas prone to seepage. Small areas of buckling from minor spills might settle back down once dried, but widespread buckling typically means the affected planks need replacement.

Professional intervention is recommended because proper diagnosis requires moisture testing, subfloor assessment, and potentially addressing underlying water issues before any flooring repair. Attempting to fix buckling without addressing the root cause will result in the problem recurring.

For a thorough assessment of your flooring situation and underlying moisture issues, contact Justyn Rook Contracting for a free consultation - we can identify whether this is a simple repair or part of a larger moisture control project.