How do I fix laminate floor gaps that appeared after my first Calgary winter?

Laminate floor gaps that appear during your first Calgary winter are almost always caused by the extreme dryness of Calgary's heated indoor air, and the good news is that most of these gaps will close on their own when humidity rises in spring and summer. Before attempting any fix, wait until May or June to see if the gaps close naturally — rushing to fill gaps in January will likely create bigger problems when the planks expand.

Why this happens in Calgary specifically. Calgary's indoor relative humidity drops to 15 to 20 percent during winter — well below the 35 to 45 percent range that laminate manufacturers specify for optimal performance. When the furnace runs constantly from November through March, it drives moisture out of the indoor air and out of the HDF core in your laminate planks. As the core loses moisture, it shrinks, and because laminate is a floating floor connected by click-lock joints, this shrinkage creates visible gaps between planks. First-winter gaps are especially common because the laminate is reaching equilibrium with Calgary's indoor climate for the first time. If the material was stored in a warehouse with different humidity conditions or wasn't acclimated in the home long enough before installation, the first-winter shrinkage can be more dramatic.

If gaps close in spring, the fix is humidity management, not floor repair. Install a whole-home humidifier on your furnace, maintaining 35 to 45 percent relative humidity year-round. This costs $400 to $800 installed in Calgary and is the single most effective thing you can do to protect every wood-based product in your home — flooring, doors, trim, and cabinetry. With consistent humidity control, the seasonal gapping cycle will be minimal. Portable humidifiers in individual rooms are a budget alternative but won't maintain consistent humidity throughout the home.

If gaps persist into summer and don't fully close, the issue is likely installation-related. The most common causes are planks that weren't properly engaged during installation (the click-lock joint wasn't fully seated), insufficient acclimation before installation, or a subfloor that isn't flat enough, causing planks to sit at slightly different heights and stress the joints. For gaps caused by unseated joints, you may be able to fix individual planks by carefully tapping them back into engagement using a tapping block and pull bar — the same tools used during installation. Work from the nearest wall inward, removing the baseboard first to access the expansion gap.

Never fill laminate gaps with wood filler, caulk, or any other filler product. This is a common mistake that leads to worse problems. Laminate planks need to move freely with humidity changes. Filling the gaps prevents this movement, and when the planks expand in spring and summer, the filled gaps create pressure that causes buckling, peaking, or permanent joint damage. The gaps exist because the planks contracted — the fix is to address why they contracted (low humidity) or to re-engage loose joints, not to fill the symptom.

If the gaps are widespread (throughout the entire floor) and severe (more than 1 to 2mm), a professional assessment is warranted. The floor may need to be partially disassembled and reinstalled with proper joint engagement, or the subfloor may need levelling in specific areas. In the worst case, if the laminate was a budget product with loose click-lock tolerances, the joints may have permanently degraded from Calgary's chinook cycling, and replacement of the worst sections may be needed.

For a professional assessment of your gapping issue, find experienced flooring contractors through the Calgary Construction Network directory at calgaryconstructionnetwork.com.

---

Looking for experienced contractors? The Calgary Construction Network connects homeowners with qualified professionals:

• Durable Decks
• Keystone Exteriors
• One OAK Flooring
• Canadian Closet
• Jk Stucco