PROSAUNAS Thermo-Spruce 2X4 S4SEE SHP Bench, Backrest & Skirting – Sauna Wood

Under four dollars a foot to start. The real thing, not a compromise.

The PROSAUNAS Thermo-Spruce 2×4 S4SEE SHP is 1.02″ thick by 3.54″ wide, the standard-width bench board in thermally modified Nordic spruce. Available in lengths of 1, 2, 3, 4, 5, 8, and 10 feet. The S4SEE profile means smooth faces, rounded edges, and a finish ready for bare skin.

Why Thermo-Spruce

Spruce is tight-grained, knotty, and amber-colored. The thermal modification (heat and steam, nothing else, no chemicals ever) takes all of that and makes it stable enough for a sauna environment. The wood is changed at a cellular level so it can’t hold moisture and won’t warp, cup, or rot the way green-treated or kiln-dried lumber does in the heat cycle of a real sauna. Strong rot resistance, low VOC, and the 3.54″ width is the classic board for bench tops, backrests, and skirting where you want a tighter gap pattern than the wide 2×6.

Be honest with yourself about the look first. Thermo-spruce has tight, characteristic knots and an amber color. It’s rustic, not modern. If you want the pale, clean, knot-free Scandinavian look, that’s thermo-aspen. Thermo-spruce is for people who like the natural, figured character. Also: thermo wood has a noticeable smell when new. It fades over the first several sessions but it’s real, and worth knowing about before the wood shows up.

Specifications

• SKU: PS-THERMO-SPRUCE-2X4-S4SEE-SHP
• Species: Thermally modified Nordic spruce
• Profile: S4SEE SHP bench board
• Thickness: 1.02″ (26mm)
• Width: 3.54″ (90mm)
• Available lengths: 1 ft, 2 ft, 3 ft, 4 ft, 5 ft, 8 ft, 10 ft
• Price: $3.88 per linear foot (MAP)
• Made in: Estonia

Where it goes

Benches, backrests, and skirting. The classic pairing: thermo-spruce for the wall cladding and structure, thermo-aspen bench boards for the seating surfaces where you want the pale, smooth, knot-free look. Or run thermo-spruce everywhere and lean into the rustic amber character — it’s the most affordable path to an all-thermo sauna interior. Pair it with the 2×6 for a mixed-width bench top.

Shipping and samples

Sold by the linear foot. Shipping is a flat $795 to the continental US, or free when you order with a heater. Free samples available so you can see the amber color and feel the knot character in person before you commit. Text your name and address to (844) 565-1113.

Call Ben² at (844) 565-1113 if you’d like to talk through the board count before you order.