Thermo-aspen keeps everything people like about aspen, the resin-free surface, the cool touch, the smooth grain, and thermally modifies it with heat and steam in controlled kilns until it turns a warm honey-brown. That thermal modification drives out the moisture and sugars that cause movement, so the boards resist rot, cupping, and shrinkage far better than natural aspen and hold their shape through years of heat and humidity. The darker tone reads as finished without any stain. It is our most popular sauna wood, milled into tongue-and-groove wall cladding and S4SEE bench, backrest, and skirting stock with eased edges.

The boards marked Thermory come from our friends at Thermory. See where they’re made, and everything else they make for your sauna, on our Thermory page.

Not sure how much you need? Send us your wall and ceiling dimensions and we will work up an exact board count and one delivered price, so you can order once and clad it clean. Call or text the shop at (844) 565-1113.

*Free samples available! Select ‘sample’ and ‘free shipping for samples’ under any wood profile.
*Most wood orders qualify for free shipping with any heater purchase.

Clear filters
No products were found matching your selection.