Thermally Modified Ayous T&G Lumber – 1x6 Fineline (120 Grit Sanded)

Looking for that clean, modern sauna look without the maintenance headaches? Our thermally modified Ayous 1x6 tongue and groove boards deliver premium performance with a sleek, refined finish.

Heat-treated for enhanced durability and stability, this lightweight hardwood resists warping, rot, and moisture — even through seasonal temperature swings. The precision-milled tongue and groove profile locks together tightly for smooth, flush joints and a professional finish every time. And with a 120-grit sanded surface, these boards are ready to stain or left to weather naturally.

If you love the look of cedar but want a more stable, sustainable alternative, Ayous is a fantastic choice — especially for sauna builds where performance really matters.

Whether you're finishing a sauna interior, accent wall, ceiling, or exterior cladding project, this lumber combines natural beauty with low maintenance and long-term durability.

Features

• Thermally modified for superior durability and dimensional stability

• Resistant to warping, rot, and moisture

• Precision-milled tongue and groove for seamless installation

• Smooth 120-grit sanded finish

• Lightweight and easy to work with

• Sustainable alternative to Western Red Cedar

• Ideal for sauna interiors and exterior cladding applications

• Available in lengths from 4' to 20'

### Includes

• 1x6 thermally modified Ayous tongue and groove boards

• Sold by the linear foot

• Random lengths (4'–20') unless otherwise requested

Need specific cut lengths? No problem — reach out for a custom quote and we’ll help you get exactly what your project calls for.

Specifications

• Material: Thermally Modified Ayous

• Profile: 1x6 Tongue & Groove (Fineline)

• Finish: 120 Grit Sanded

• Thickness: 1" nominal

• Width: 6" nominal

• Lengths: 4'–20' (random lengths)

• Use: Interior or exterior applications, including sauna construction

• Sold By: Linear foot