It can be difficult to select the correct decking material for your project, especially when there are so many choices. Thermowood decking and composite boards are two common outdoor decking materials. Each has unique advantages and both can provide functional and esthetic outdoor spaces. The real question, however, depends on the specific situation: Which option will work best for your needs?
What is Thermowood Decking?
It is natural wood timber treated without the use of chemicals, and instead, heat is used. In a controlled setting, the wood is heated to very high temperatures so that the wood cellular structure can be modified. The end result are improvements to the wood timber’s stability, and resistance to natural rot, while even still being a natural material. The Finnish companies first introduced this method to the world and it has spread to the rest of Europe, gaining popularity, for the last two decades.
The entire treatment process first causes the wood to turn an attractive shade of brown. This visually appealing color makes the natural wood tend to stand out and be noticed. The most common wood varieties used for this process include pine and spruce, both of which are very common and available in the timber industry, and both of which modify thermally to the process very well.
What is composite decking?
Composite decking is where wood fibers are combined with plastic polymers to form decking boards that are supposed to bring together all the benefits of both components. Every supplier has different wood content, but usually, composites have around 50-70% wood fiber. The plastic element gives everything together and provides weather resistance as well.
These boards are the first of their kind as an alternative to timber. They are directed particularly towards those with low maintenance needs and come with different color options and textured finishes. Some try to mimic wood, while others have a more smooth modern look.
How Much Maintenance Does Composite Decking Require?
This is where the two differing materials stand dividing, thermowood decking will require regular maintenance. You will want to wash it and rub a bit of oil on it to maintain that rich color every once in a while. Otherwise, it will fade to a silver-grey over time and some actually really like it.
Composite decking has a bit less regular maintenance to it. Usually, a wash every so often does the trick. It’s maintenance-free, despite the claims some marketing suggests, and can be a bit of a hassle on some stains. It’s pretty easy to scratch some materials, and unlike wood, you can’t sand them down. Longevity and Durability
When installed properly, both materials have the potential to last for decades. Thermowood has been used for Scandinavian Decking for years and has proven to endure harsh, wet and frozen conditions. The thermal treatment improves the natural durability of the woods, yet is still not invincible. Adequate ventilation and proper installation are still critical.
Composites are generally resistant to rotting and insect damage due to the plastic composite contents. However, they are also likely to expand and contract with temperature variances, sometimes more than natural wood. There were issues with fading and staining with early generation composites, although improvements have been made with newer formulations.
Environmental considerations
This is where things get interesting. Thermowood Decking is a natural, renewable resource that has been modified without the use of chemicals. It can also biodegrade and be used as energy once it has reached the end of its useful lifespan. However, considerable amounts of energy are required for the thermal modification process.
Composite decking, along with some plastic, also often has some recycled materials. While it sounds positive, the plastic content is not biodegradable. Some manufacturers will take old boards back, but that is not standard practice. The process of production also involves chemical bonding agents.
The Cost Factor
In terms of pricing for decking materials, Thermowood Decking falls within the upper middle tier. It is pricier than standard pressure-treated wood, but is generally cheaper than the high-end composite materials. If you choose to keep the colour, you will also need to consider the additional costs for oils or protective treatments.
You can find composite decking at a wide range of prices, depending on the type you choose. Some of the cheaper composites may be priced under thermally modified wood, but some of the premium options will be priced higher. If you hired a professional, the installation costs will be about the same for both materials.
Making Your Decision
There is no universally correct answer. If you like the authentic feel of real wood under your feet and don’t mind a little maintenance, then this is a great option, as it does get a little weathering, can be natural and easily repaired, and some people like the connection to natural materials.
Composite is a great option for people who want no hassle and like the consistent colour throughout the life of the deck. It is also good for people who have a situation that doesn’t allow much maintenance, or a situation that will have heavy use and may get some markings on natural wood.
Keep in mind your priorities, budget, and how you would like to use your outdoor area. When both materials are selected for the right reasons, they can both make great decking areas.