PROSAUNAS Thermo-Aspen 1X5 T&G STS4 Wall Cladding – Sauna Wood

Wider boards. Fewer seams. A quieter wall.

The PROSAUNAS Thermo-Aspen 1×5 T&G STS4 Wall Cladding is 0.59″ thick and 4.72″ wide, with 4.3″ of coverage once the tongue seats into the groove. Available in 6, 7, 8, and 10-foot lengths. The extra width over a 1×4 means fewer board lines across a wall, which reads broader and calmer, and covers a given surface in less linear footage.

Why Thermo-Aspen

Cladding is where thermal modification earns its keep. An untreated board in a hot, humid sauna will pull in moisture, swell against its neighbor, and over a few seasons the seams start to move. Thermo-aspen has already been through extreme heat and steam, no chemicals ever, which changes the wood at a cellular level so it can’t hold moisture and won’t expand and contract. The warm golden-brown color runs all the way through the board, so a cut end at the ceiling line matches the face and the room reads as one piece.

One honest note: every sauna wood is soft and will scratch, and thermal modification doesn’t change that. The upside is you can sand it back and refinish it years from now without hurting a thing.

Specifications

• SKU: PS-THERMO-ASPEN-1X5-TG-STS4
• Species: Thermo-Aspen (thermally modified)
• Profile: 1×5 STS4 tongue-and-groove wall cladding
• Actual width: 4.72" (4.3" coverage per row)
• Actual thickness: 0.59"
• Process: heat and steam only, no chemicals
• Made in: Estonia
• Sold by: the linear foot

Where it goes

Walls and ceilings, especially larger rooms where the wider board keeps the wall from looking busy. Pair it with our Thermo-Aspen or Thermo-Spruce bench wood for a matched interior. Do the math on coverage before you order and reach out if you want us to check the board count.

Shipping and samples

Sold by the linear foot. Shipping is a flat $795 in the continental US, or free with a heater order. Not sure on the board count? Text your name and address to (844) 565-1113 for free samples.

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