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.
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
Ships in 1-5 days at most
Includes $373.99 in bonuses with your order
The Primal Reset Guide
$24.99Free
Freight Protection, Fully Covered
$349Free
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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.
| 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. |
Three reasons sauna builders prefer Alder for interior wall and ceiling finishes.
Alder performs reliably in high temperatures. Its stable structure helps prevent warping and movement - keeping wall panels aligned and looking consistent over time.
With low resin content and balanced moisture behavior, Alder resists humidity-related issues. This helps maintain durability and comfort in demanding sauna conditions.
Its smooth surface, fine grain, and soft color tone create a welcoming look. Ideal for achieving a clean, cohesive, and relaxing sauna environment.
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.
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
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.
Support
Nearly impossible to reach a real person. Endless chatbot loops, auto-replies, and unreturned emails.
Real humans. We answer quickly. Always here, always helpful
Order Processing
Orders often sit for days before being acknowledged. No clear confirmation, updates, or timelines.
Orders are processed immediately. You'll receive confirmation, tracking, and real-time updates within hours.
Shipping
Slow, vague, and unoptimized. Basic carriers, minimal tracking, and delayed delivery windows.
Fast, insured, and fully trackable shipping — optimized for speed and visibility every step of the way.
Pricing
Hidden fees, bait and switch tactics, post purchase price increases.
Our relationships guarantee the lowest prices. Transparent and fair. No surprises at checkout, and no shady
tactics after the sale.
Returns & Warranty
Policies are confusing and designed to frustrate, delay, and deny returns with zero accountability.
Clear, honest, and fast. Our return policy is built to protect your investment, not dodge responsibility.
Support
Frustrating automated responses
Fast, helpful and always supportive
Order Processing
Delays and lack of communication
Instant processing and updates
Shipping
Slow, unreliable and delayed service
Fast, insured, trackable shipping
Pricing
Deceptive pricing practices
Lowest prices, no surprises
Return & Warranty
Frustrating, misleading return policies
Clear, honest return policy
Read their reviews where they can't curate them, Trustpilot, not their own widget; read the one-star reviews and watch how they respond when freight goes sideways. You can see our Trustpilot reviews here
Ask what happens when a unit arrives damaged, you're listening for a person who owns it, not store-blames-manufacturer ping-pong.
Get the delivered price in writing before payment, "freight quoted after purchase" is the oldest move in the category.
Ask for a name, if nobody owns your order, nobody owns your problem.
What comes with every order
Bonus 1
Stop guessing and start your wellness journey with a plan. The Primal Reset Guide gives you a clear framework for building consistent routines, understanding your sessions, and staying on track as you progress. Instant delivery to your inbox after purchase.
Bonus 2
Your large order ships fully insured, so you're covered from our warehouse to your door. If something goes wrong, you don't have to spend hours on the phone with FedEx or the manufacturer. Our Shipping Concierge Service handles the calls, claims, and coordination for you, using our established relationships to get solutions moving faster. Inspect your delivery before signing off and document any damage right away.
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