TESLI EXTRA Thermo Basswood Tongue & Groove Sauna Board | Lumber – Premium Wood Cladding for Saunas and Interior Spaces

The TESLI EXTRA Thermo Basswood Tongue & Groove Sauna Board | Lumber is a high-quality sauna cladding material crafted for superior performance and a refined visual appeal. Designed for saunas, steam rooms, relaxation areas, balconies, and indoor wall paneling, this board combines the beauty of natural wood with exceptional functionality in high-humidity environments.

Made from thermally treated basswood, this board offers improved moisture resistance, dimensional stability, and a naturally rich caramel tone. The EXTRA grade quality ensures minimal knots and a smooth, luxurious surface—making it a perfect fit for both residential and commercial sauna designs.

Key Features:

• Premium Thermo-Treated Basswood: Heat-treated for enhanced stability and water resistance, with a rich, caramel-toned finish
• Dimensions: Working width: 70 mm (2 3/4″), thickness: 11 mm (7/16″), lengths: 1,900–3,000 mm (6’3″ to 9’10”)
• Tongue & Groove Fit: Ensures secure installation and a seamless appearance
• Comfort & Safety: Low-density wood remains cool in high temperatures for safe, pleasant contact
• Natural Aroma: Gently aromatic, adding a calming, spa-like ambiance
• EXTRA Grade Quality: Nearly knot-free with up to 3 mm (1/8″) knots, sap-free, and hand-selected for a clean, elegant look
• Custom Finish Option: Can be treated with linseed oil for a deeper tone and added durability

The TESLI EXTRA sauna board is an excellent choice for those who want long-lasting, stylish, and reliable wood cladding in their sauna or interior project. Now available for sale in the United States and Canada. Need help calculating your project needs? Use our DIY sauna kit calculator for a custom solution.