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For our premium products such as hot tubs and saunas, we use thermowood. This is a natural cladding of wooden planks that you see more and more often. This is not only because of its durability, quality and longevity, but also because of its natural dark brown color. Thermowood does not grow directly from a tree, but is created through a thermal process. This is why you often come across this type of wood as thermally modified wood.
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The thermowood we use is made of Scandinavian pine from sustainably managed forests. The properties of this pine wood are improved by thermal modification. This is a natural process in which no chemicals are added to the wood. The treatment takes place only with heat and steam. In this way, thermo wood is a solid wood in its purest form.
During thermal modification, the boards are put into a large oven of at least 200 degrees for a long period of time, at least 30 hours. Here the wood is "treated" with heat and steam.
Often this thermal process consists of three phases. During the first stage, heat is used to extract moisture from the wood, preventing steam burning and cracking.
In the next stage, a constant temperature is maintained to allow chemical and physical changes to take place. Thus the Hemicelluloses contained in wood are drastically reduced and the wood acquires its unique dark brown color during this stage. At the end of this stage, all the moisture is extracted from the wood.
After high-temperature drying, the temperature in the kiln is lowered through the use of steam. This adjusts the moisture content of the finished product, giving the wood a moisture content of 4 to 7 percent. This improves the dimensional stability and durability of the wood without risk of cracking.
Thermally modified wood is known for its excellent insulating properties and high durability rating with a lifespan of 15 to 25 years untreated wood lasts an average of 5 to 10 years. Even if you treat it with a varnish. The thermal modification process thoroughly dries the wood and removes harmful extracts, minimizing the moisture content. This makes the wood highly dimensionally stable and resistant to shrinkage and expansion, which is essential for durability.
In addition,the heat and sound insulation of thermo wood is up to 30% better than that of natural wood. Thermowood is the perfect application to use outdoors and does not need to be treated with toxic substances to give it extra protection. This can be done with wheat oil, for example. The changes that take place during the process make the wood resistant to insects, fungi and rot, which significantly extends its lifespan. In general, thermally modified wood lasts for many years, often much longer than untreated wood, resulting in lower maintenance costs and a longer life.
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Thermo wood is the key to creating a unique, warm and timeless look for our hot tubs. With a strength that is essential for durable construction, the wood provides a solid foundation for our hot tubs. With a thickness of 18 mm, thermo wood not only has a robust look, but also provides excellent insulating value. This means you can enjoy the warmth in your hot tub for longer.
At Welvaere , we go one step further to give you the best possible experience. We manufacture matching accessories, such as stairs, with the same thermo wood. This not only creates a harmonious aesthetic, but also ensures the durability and consistency of the material throughout your hot tub experience. Thermowood not only adds warmth and style to our hot tubs, but also provides the strength and insulation needed for a great spa experience.
Thanks to its excellent insulating properties and durability, thermo-modified wood is the ideal choice for outdoor saunas. With a thickness of 42 mm for the outer walls and 30 for the inner walls, thermo wood offers excellent thermal insulation, which is essential in an outdoor sauna in maintaining heat and, of course, heating costs. This insulating value ensures that the sauna heats up quickly and retains heat, allowing you to enjoy an energy efficient and comfortable sauna experience.
What makes thermo wood even more special is that it offers almost the same quality and properties as the more expensive Canadian Red Cedar wood, which is often used for outdoor saunas. The big advantage of thermo wood, however, is its cost-effectiveness. You get similar quality without the high cost.
But that's not all. Thermowood adds an extra dimension to the sauna experience by giving off a wonderful natural fragrance. This pleasant scent adds to the overall wellness experience and creates a relaxing atmosphere in your outdoor sauna.
In short, thermo wood combines insulation, durability, cost-effectiveness and a pleasant smell, making it the perfect choice for outdoor saunas and we have been using this material for 10+ years.
Do you have to treat the wood? Well, it doesn't have to. But we definitely recommend it. A lick of wheat oil will really make the hot tub or sauna look a lot nicer. If you don't, the wood will turn a gray color.
We recommend checking every change of season. If you see those knots turning gray then it's time for a paint job. We recommend doing this with tar oil. This is because tar oil has a good impregnating effect and a water-repellent effect.
Read below or visit help.welvaere.co.uk
Your questions will be answered by experts with years of experience. We know exactly what you need.
All our products are designed and largely made in Nijkerk and Putten in the Netherlands.
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