Thermowood Aspen — Interior & Sauna

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Aspen (Populus tremula) is the classic wood for sauna benches and interior paneling. Low thermal conductivity — it never gets hot to the touch — plus a light, bright grain that ref lects light and warms a space. We offer it in two sizes for walls, ceilings, benches, and feature interior surfaces. Sizes 3/4×4 — 3/5" × 3-1/2" (15 mm × 90 mm), the sauna bench standard 1×4 — 1" × 3-1/2" (25 mm × 90 mm), slightly heavier for wall and ceiling use Specifications Species: Nordic Aspen (Populus tremula) Treatment: Thermally Modified Timber (premium grade) Color: Light honey-caramel, lighter than Pine Finish: Unfinished Common uses: sauna benches & walls, interior paneling, ceiling planks Why aspen for sauna Aspen is the traditional choice of Finnish sauna builders. It has the lowest thermal conductivity of any readily available softwood — meaning benches remain comfortable even at 90 °C / 195 °F air temperatures. It's knot-light, splinter-free, and does not leach resin under heat. Show more