Quels sont les effets de l'humidité sur un plancher verni?
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What are the effects of humidity on a varnished floor?

The Effects of Humidity on a Varnished Floor: Understanding and Prevention

In the field of floor sanding and varnishing, the impact of humidity on a varnished floor is a crucial concern. At Plancher Deluxe, located in Montreal and serving Laval, Longueuil, South Shore, and North Shore, we are experts on this subject. This article aims to inform our clients about the consequences of humidity and to provide practical solutions for maintaining the beauty and durability of their floors.

Understanding Humidity and Its Effects

Relative humidity in a home can vary with the seasons and weather conditions. This humidity directly impacts wooden floors, especially those that have been varnished. Here are some notable effects:

  • Expansion and Contraction: Wood is a hygroscopic material, meaning it absorbs or releases moisture depending on its environment. This reaction can cause the wood to expand and contract, affecting the integrity of the floor.

  • Varnish Cracking: When the wood expands or contracts, the varnish can crack. These cracks compromise not only the aesthetics of the floor but can also diminish its protection against other damages.

  • Discoloration: Excessive moisture can also lead to discoloration of the wood and varnish, altering the natural appearance and shine of the floor.

Prevention and Maintenance

To avoid damage caused by humidity, it is essential to maintain a stable humidity level in your home. Here are some tips:

  • Use of a Hygrometer: This device measures the relative humidity in the air. Keeping a humidity level between 40% and 60% is ideal for wooden floors.

  • Dehumidifiers and Humidifiers: These devices help to regulate humidity in the home, especially useful during extreme seasons.

  • Regular Ventilation: Ensuring good air circulation can also help to stabilize humidity levels.

  • Varnish Maintenance: A quality layer of varnish, properly applied, can act as a protective barrier against humidity fluctuations.

Specific Solutions for Each Type of Floor

At Plancher Deluxe, we offer varnishing solutions tailored to different types of floors:

  • Terrace Flooring: These floors are exposed to outdoor elements and require a varnish resistant to UV and climatic variations.

  • Varnished Stairs: Stairs undergo high traffic and require a durable and non-slip varnish.

  • Antique Floors: These floors require special attention to preserve their historical character while protecting them against humidity.


Humidity can have detrimental effects on varnished floors, but with the right knowledge and preventive measures, these effects can be minimized. At Plancher Deluxe, we are committed to providing the best varnishing solutions to our clients in Montreal, Laval, Longueuil, and the South Shore and North Shore regions, ensuring the longevity and beauty of their floors.

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