ProSaunas ALDER 1X5 (15mm x 120mm) T&G STS4 | Sauna Wood, Tongue & Groove, STS4 Profile, Nickel-Gap, Wall Material
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Official Distributor
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.
Starts at: $1.63/mo Learn More
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Monthly payments start at: $1.63/mo Learn More
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Refined Panels. Seamless Style.
PROSAUNAS Alder 1×5 STS4 is a high-quality sauna cladding wood crafted to provide a smooth, consistent finish across sauna walls and ceilings. With its tongue and groove design and subtle nickel-gap profile, it delivers a clean, uniform appearance while allowing for natural expansion.
Alder is valued for its warm tone, fine texture, and low resin content, making it comfortable to the touch even in high temperatures. Its stable structure helps maintain shape and performance under the intense heat and humidity of sauna conditions.
Each board features an STS4 profile, designed for precise alignment and easy installation. The tongue and groove connection ensures a secure fit, while the nickel-gap detail enhances visual depth and airflow between panels.
PROSAUNAS uses carefully selected Alder timber to ensure consistent color, smooth grain, and reliable durability. The result is an elegant and practical wall material suitable for both home and commercial sauna interiors.
Features & Benefits
| Feature | Benefit - Why It Matters to Your Build |
|---|---|
| Alder Sauna Wood | Naturally warm hardwood suited for sauna interiors - provides a smooth feel, low resin content, and comfortable surface in high heat. |
| STS4 Tongue & Groove Profile | Interlocking board design with nickel-gap spacing - ensures a secure fit and visually consistent panel alignment. |
| Nickel-Gap Detail | Subtle shadow-line spacing between boards - adds depth while allowing for natural expansion and airflow. |
| Wall & Ceiling Cladding Use | Designed for full interior coverage - creates a clean, continuous finish across sauna surfaces. |
| Stable in Heat & Humidity | Maintains form under temperature and moisture changes - reliable for long-term sauna performance. |
| Smooth Planed Surface | Evenly finished faces for a refined look - enhances comfort and overall aesthetic quality. |
| Fine, Consistent Grain | Uniform texture with gentle pattern - delivers a calm and cohesive visual appearance. |
| Low Resin Content | Minimal sap presence - prevents stickiness and improves comfort during sauna use. |
| Easy Installation System | Precision-milled boards fit together smoothly - simplifies fitting and reduces installation time. |
| Ideal for Sauna Interiors | Balances durability, appearance, and comfort - perfect for both residential and commercial sauna spaces. |
Why Choose Alder STS4 Cladding for Your Sauna Interior?
Three reasons sauna builders prefer Alder for interior wall and ceiling finishes.
Stable in Sauna Heat
Alder performs reliably in high temperatures. Its stable structure helps prevent warping and movement - keeping wall panels aligned and looking consistent over time.
Handles Moisture Well
With low resin content and balanced moisture behavior, Alder resists humidity-related issues. This helps maintain durability and comfort in demanding sauna conditions.
Warm, Natural Appearance
Its smooth surface, fine grain, and soft color tone create a welcoming look. Ideal for achieving a clean, cohesive, and relaxing sauna environment.
Specifications
What's Included
- Alder 1×5 Cladding Boards
- STS4 Tongue & Groove 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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