ProSaunas THERMO-ASPEN 1X5 (15mm x 120mm) 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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Wide Boards. Seamless Finish.
PROSAUNAS Thermo-Aspen 1×5 T&G STS4 is a high-quality sauna wall panel designed for broader wall coverage and refined interior finishes. With its tongue and groove system and subtle nickel-gap detail, it creates clean, consistent lines while adding depth and visual interest to the sauna space.
Thermally modified Aspen provides enhanced durability and dimensional stability, making it well-suited for sauna environments. The heat treatment process reduces moisture movement and deepens the wood’s natural tone, ensuring dependable performance in high heat and humidity.
Each board is precision-milled for an accurate fit and easy installation. The STS4 profile ensures smooth surfaces and defined spacing, offering a modern appearance combined with reliable functionality.
PROSAUNAS selects quality Aspen to achieve uniform colour, fine grain, and long-lasting performance. This makes it an excellent choice for both residential and commercial sauna wall applications.
Features & Benefits
| Feature | Benefit - Why It Matters to Your Build |
|---|---|
| Thermo-Aspen Wide Panels | Heat-treated sauna wood – boosts stability, enriches tone, and reduces moisture movement. |
| T&G STS4 Profile | Tongue and groove system with nickel-gap – forms clean lines and consistent spacing. |
| Wall Cladding Purpose | Designed for larger surface coverage – creates a balanced and uniform interior finish. |
| Secure Board Connection | Interlocking edges fit firmly – ensures alignment and minimises visible gaps. |
| Reliable in Sauna Heat | Withstands high temperature and humidity – retains shape and integrity over time. |
| Smooth Planed Surface | Precisely machined finish – improves comfort and visual appeal. |
| Even Colour & Grain | Uniform thermo-treated look – supports a cohesive design style. |
| Durable & Stable Timber | Limits warping and expansion – ensures long-term performance. |
| Easy Installation Fit | Accurate dimensions – allows quick and efficient placement. |
| Elevates Sauna Interiors | Adds depth and refined lines – enhances overall design quality. |
Why Select Thermo-Aspen Wall Panels for Your Sauna Interior?
Three reasons installers choose this profile for smooth wall cladding and consistent finishes.
Engineered for Sauna Heat
Thermally modified Aspen is built to handle high temperatures. Its enhanced stability limits expansion and contraction, keeping panels aligned and secure.
Resistant to Moisture
The heat-treatment process improves performance in humid conditions. This helps reduce warping and movement, supporting long-term durability.
Defined and Balanced Lines
The STS4 tongue and groove profile with nickel-gap creates even spacing. Its smooth finish and warm tone give a clean, modern sauna interior.
Specifications
What's Included
- Thermo-Aspen 1×5 Wall Board
- 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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