Alder Sauna Wood

About

Alder Sauna Wood Alder is one of the most popular sauna woods in Scandinavia and the Baltic states, prized for its calm beige tone, pleasant smooth texture, and excellent performance in high-heat environments. It's naturally water-repellent, doesn't overheat (stays comfortable against bare skin at sauna temperatures), and produces no resin. The light, neutral color makes alder a versatile choice that pairs well with darker accent woods or stands on its own for a bright, clean Scandinavian-style sauna interior. All of the alder sauna wood we carry is sourced from ProSaunas — select grade, milled specifically for sauna applications. Wondering which wood species is right for your build? Read our guide: Best Sauna Wood Types . Wall & Ceiling Cladding Alder wall cladding comes in tongue-and-groove profiles that interlock for a seamless surface. We carry three gap profiles — the difference is visual, not structural — so choose based on the look you want: 1×4 Nickel Gap — A small flat-bottomed gap (about the width of a nickel) separates each board. Clean, contemporary lines with subtle shadow gaps. Coverage is 3.1" per board. The most popular profile for modern sauna builds. 1×4 Medium Gap — A slightly wider gap between boards for a more defined shadow line. Same 3.1" coverage per board. Adds a bit more visual rhythm to the wall compared to nickel gap while still looking refined and modern. 1×3 Large Gap — Dramatic, broad grooves between narrower boards create a bold, textured wall surface with strong shadow lines. Use on a flat wall for a striking design statement. This profile is the most visually distinctive of the three and works especially well as an accent wall when combined with a tighter profile on surrounding walls. Bench Material Alder bench boards are milled smooth on all sides for a comfortable, splinter-free surface against bare skin. No tongue-and-groove — boards lay flat across a bench support frame with small gaps between them for air circulation and wa