Heat-treated and untreated interior panels for various spaces and needs differ from each other in terms of appearance, durability, moisture resistance, and applications. Heat treatment turns wood brown, improves its moisture and rot resistance, and reduces wood movement. Untreated panels, on the other hand, retain the wood’s natural light color and are particularly suitable for dry indoor spaces. The choice between these depends on the application, desired appearance, and durability requirements.
What does heat treatment of wood mean?
Wood heat treatment is a natural process where wood is heated in a controlled manner to temperatures of 175-210 degrees without chemicals. In the first phase of treatment, the lumber is dried completely by rapidly raising the temperature to 100 degrees. Once the wood is dry, the temperature is slowly raised to 175-210 degrees for 1.5-3 days depending on the wood species, raw material thickness, and desired color shade.
The process uses water vapor and hot air, which change the chemical structure of the wood. Water vapor acts as protection by preventing the wood from cracking and igniting. Finally, the lumber temperature is lowered back to normal. The result is a beautifully brown, pleasantly fragrant, and durable material. Heat treatment is completely non-toxic and ecological, using only heat and water vapor.
How does heat treatment change the properties of wood?
Heat treatment significantly changes the properties of wood. The most important changes are visible both in the wood’s appearance and its performance characteristics:
- Color and appearance: The wood becomes thoroughly colored in an elegant brown. The color shade depends on the treatment temperature – higher temperature produces a darker result.
- Moisture movement: Heat treatment reduces wood moisture movement by up to 40-50%. This makes the material more stable in various moisture conditions.
- Moisture and rot resistance: The wood’s ability to absorb moisture weakens, which improves its durability in humid spaces and prevents decay.
- Thermal insulation: Heat-treated wood insulates heat better than untreated wood.
- Resin-free quality: The treatment removes resin from the wood, making it an excellent material for sauna bench wood, for example.
- Fragrance: The treatment creates a pleasant, caramel-like wood fragrance that lasts for a long time.
- Weight: Heat-treated wood is lighter than untreated wood.
Untreated wood, on the other hand, retains the natural color and structures characteristic of the wood species. It is often lighter and more flexible material than treated wood, which may be easier to work with.
Which spaces are heat-treated panels best suited for?
Heat-treated panels are excellently suited for spaces with high moisture stress or temperature variations. These spaces include especially:
Saunas: Heat-treated aspen and alder are ideal materials for sauna panels and bench wood. They withstand heat and moisture well and don’t become unpleasantly hot. Their resin-free quality makes them safe and pleasant to use.
Bathrooms: Thanks to their moisture and rot resistance, heat-treated panels are well suited for bathrooms where moisture stress is continuous.
Terraces and exterior cladding: Due to better weather resistance, heat-treated panels are a good choice for outdoor spaces as well.
Interior applications: The elegant brown color suits many interior solutions, such as accent ceilings, walls, and other design elements where visual impact is desired.
The reduced moisture movement of heat-treated wood makes it an especially good choice for spaces where moisture conditions vary. This reduces cracking, warping, and other moisture-related problems.
When should you choose untreated panels instead of heat-treated ones?
Untreated panels are an excellent choice in many situations. They should be chosen especially in the following cases:
Dry indoor spaces: In living rooms, bedrooms, and other dry spaces, untreated wood works well since moisture problems are minimal.
When you want to preserve the wood’s natural color: If the interior design aims for a light, Scandinavian look, untreated aspen or alder is a naturally light alternative.
Budget-limited projects: Untreated wood is generally more affordable, making it a cost-effective choice for larger projects.
Surface-treated applications: If the panels are intended to be painted or varnished in specific colors, heat treatment may not necessarily add value.
Easy workability: Untreated wood is often softer and easier to work with, which can be an advantage in customized solutions.
Untreated panels also offer more possibilities for personal surface treatment and customization. With them, you can create exactly the look you want.
How does heat treatment affect the price and availability of wood panels?
Heat treatment affects both the price and availability of panels in several ways:
Price impact: Heat-treated panels are typically 20-40% more expensive than corresponding untreated products. This is due to the costs of the heat treatment process, longer production time (1.5-3 days), and the specialized expertise required for the treatment.
Availability: The availability of heat-treated products may vary more than untreated ones. Specialty products and rarer wood species may require longer delivery times. On the other hand, manufacturers with their own heat treatment facility can offer more reliable availability.
Long-term cost effectiveness: Although heat-treated products are more expensive, their longer lifespan and better durability often make them a more cost-effective choice in the long run, especially in demanding conditions.
High-quality and responsibly produced wood panels and lumber products are an investment that pays for itself in durability and satisfaction. Heat-treated products manufactured on modern production lines meet high quality requirements and offer consistent quality for construction and interior design.
We at Pieksäwood manufacture high-quality heat-treated panels and bench wood with over 20 years of experience. In our modern heat treatment facility in Pieksämäki, we ensure that our products meet the highest quality requirements. Whether it’s a sauna, bathroom, or spectacular interior solution implemented with high-quality wood panels, we help you find exactly the right material for your needs. Contact us for expert guidance on choosing the perfect wood panels for your project.