Build Better with Expertly Crafted Sauna Wood

The key difference between regular and thermo sauna wood lies in how the timber is treated. Thermo timber, such as thermo pine,  thermo radiata pine, thermo aspen and thermo alder, is naturally treated using heat to improve its durability, stability, and resistance to moisture. This process removes resins and saps, meaning no hot sticky resins burning your skin and a lower risk of resin bleed-through when applying paraffin oil treatment to your sauna. 

Thermo-treated cladding also reduces the warping and cracking of your sauna, meaning it ensures longevity and reduces the need for maintenance. This makes thermo-treated timbers the most popular choice for high-performance sauna construction. Thermo-treated wood also develops a deeper, richer colour and a pleasant toasted aroma,  giving it a more refined, luxurious appearance. 

While regular types of wood like spruce, common aspen, and red cedar are all excellent for sauna walls, sauna doors, and bench timber. Both options are used in sauna construction, but thermo timber offers added performance and longevity for those seeking a premium finish.

At Finnmark, we know how important it is to keep your sauna looking fresh. That's why we offer a range of top-quality sauna timber cleaning products to maintain hygiene and cleanliness in every sauna room. We stock products such as sauna paraffin oil, sauna cleaner eucalyptus, to work on every type of sauna wood. These products help preserve the natural beauty of your sauna timber, reducing sweat stains, moisture damage, and long-term wear across sauna walls, wall panels, and timber cladding. 

From regular upkeep to deep cleans, our treatment range supports every stage of sauna maintenance, helping you enjoy a fresh, long-lasting retreat. For more information on cleaning treatment, read our complete guide to cleaning your sauna. 

Finnmark also offer sauna maintenance and servicing services to take your cleaning to the next level.

The main difference between thermo pine and thermo radiata pine is their appearance and grain structure. Both sauna wood types appear slightly different, but they do still have the same amount of knots. Thermo pine offers a more traditional look with a pronounced grain, bringing a rustic, natural feel to your sauna design. While thermo radiata pine has a smoother, more uniform grain, making it ideal for sleek, modern sauna rooms. 

Both are thermally modified for improved durability, making them excellent for sauna walls, bench timber, and timber cladding in any high-quality sauna construction project.

Building your DIY sauna using high-quality sauna timber starts with careful planning and the right materials. At Finnmark, we can support you when it comes to DIY and Build Your Own Sauna projects, designed to support you through every stage of the process. We can provide expert advice and guidance on how to assemble your kit free of charge. Whether you’re creating a compact home sauna or a spacious retreat, our team of specialists is here to help you choose the right materials for your space. For further information, explore our comprehensive how to build a sauna guide. 

Our team of professionals will work with you to create and design your dream sauna from start to finish, with the help of our detailed design presentation and knowledge of materials to ensure peace of mind on your project. Start your journey toward creating your own bespoke sauna experience and contact Finnmark today.