ProSaunas THERMO-ASPEN 1X4 (15mm x 90mm) T&G STS4 | Sauna Wood, Thermally-Modified, Tongue & Groove, STS4 Profile, Nickel-Gap, Wall Material
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An Important Note on Pricing and Returns:
We believe in upfront pricing and fair policies—no hidden fees, no surprises, and easy,
transparent returns. If you're comparing options, we encourage you to review
competitors’ fine print carefully.
We've helped countless customers who had issues elsewhere, and we’re here to make sure
that never happens to you.
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Clean Lines. Seamless Walls.
PROSAUNAS Thermo-Aspen 1×4 T&G STS4 is a premium sauna wall panel designed for consistent wall cladding and refined interior finishes. Featuring a tongue and groove system with a subtle nickel-gap detail, it creates clean, uniform lines while enhancing the overall visual depth of the sauna space.
Thermally modified Aspen offers superior durability and dimensional stability, making it ideal for sauna environments. The heat treatment process reduces moisture movement and enriches the wood’s natural tone, ensuring reliable performance under high temperatures and humidity.
Each board is precision-milled for accurate fit and straightforward installation. The STS4 profile ensures smooth surfaces and defined spacing, delivering a balanced combination of modern detail and practical performance.
PROSAUNAS carefully selects high-quality Aspen to achieve consistent colour, fine grain, and long-lasting durability. This makes it a dependable choice for both residential and commercial sauna wall applications.
Features & Benefits
| Feature | Benefit - Why It Matters to Your Build |
|---|---|
| Thermo-Aspen Wall Boards | Heat-treated sauna wood – improves stability, deepens colour, and limits moisture movement. |
| T&G STS4 Profile | Tongue and groove design with nickel-gap – creates clean lines and defined spacing. |
| Wall Cladding Use | Designed for full wall coverage – delivers a uniform and structured interior finish. |
| Interlocking Board System | Boards fit tightly together – ensures secure alignment and minimal gaps. |
| Performs in Sauna Heat | Handles high temperature and humidity – maintains shape over time. |
| Smooth Planed Finish | Carefully machined surface – enhances comfort and visual quality. |
| Consistent Tone & Grain | Even thermo-treated appearance – provides a cohesive interior look. |
| Stable & Durable Wood | Reduces warping and expansion – supports long-term performance. |
| Quick Installation Boards | Precision-milled sizing – allows efficient and accurate fitting. |
| Enhances Sauna Interiors | Adds depth and clean detailing – elevates overall design appeal. |
Why Choose Thermo-Aspen Wall Panels for Your Sauna Interior?
Three reasons installers prefer this profile for smooth wall cladding and consistent finishes.
Built for Sauna Heat
Thermally modified Aspen is designed for high temperatures. Its improved stability reduces expansion and contraction, helping panels stay aligned and secure.
Manages Moisture Well
The heat-treatment process enhances resistance to humidity. This helps minimise warping and movement, ensuring long-lasting wall performance.
Clean and Uniform Lines
The STS4 tongue and groove profile with nickel-gap creates defined spacing. Its smooth surface and warm tone deliver a modern, polished sauna interior.
Specifications
What's Included
- Thermo-Aspen 1×4 Wall Panel
- STS4 T&G Nickel-Gap Profile
Shipping Information
Wood products ship via standard freight. Shipping cost is calculated based on order quantity, board lengths, and your delivery location — it is not included in the listed price and will be quoted separately.
- Standard freight shipping on all wood orders
- Shipping cost varies by order size and destination
- Contact PROSAUNAS for a freight quote before ordering
- Bulk orders may qualify for volume pricing
- All orders inspected before shipment for quality assurance
📞 Have Questions?
Our team has 55+ years of experience helping builders select the right wood. We're happy to help you calculate quantities, confirm sizing, or get a shipping quote.
Call: (800) 957-2862
Email: info@peakprimalwellness.com
Mon–Fri 8:00am–5:00pm CT
The PROSAUNAS Quality Promise
PROSAUNAS carefully selects only the finest wood from Northern Europe and Canada, ensuring quality and consistency that meets our stringent standards. Every board is inspected before it ships — because a great sauna starts with great materials.
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