ProSaunas ALDER 1X4 (15mm x 90mm) T&G STS4 | Sauna Wood, Tongue & Groove, STS4 Profile, Nickel-Gap, Wall Material
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: $1.00/mo Learn More
Or
Monthly payments start at: $1.00/mo Learn More
Ships in 1-5 days at most
Couldn't load pickup availability
Smooth Panels. Subtle Detailing.
PROSAUNAS Alder 1×4 STS4 T&G is a premium sauna cladding wood designed to deliver a clean, refined finish across walls and ceilings. With its tongue and groove construction and subtle nickel-gap profile, it creates a consistent look while allowing for natural expansion.
Alder is appreciated for its warm color, fine grain, and low resin content, making it comfortable to the touch even in high sauna temperatures. Its stable structure supports long-term performance in environments with constant heat and humidity.
Each board features the STS4 profile, providing tight alignment with a slight shadow gap for visual depth. Its precise dimensions and smooth machining ensure easy installation and seamless integration with other sauna materials.
PROSAUNAS selects high-quality Alder timber to maintain consistent tone, smooth texture, and reliable durability. The result is a practical and elegant wall material suited for both residential and commercial sauna interiors.
Features & Benefits
| Feature | Benefit - Why It Matters to Your Build |
|---|---|
| Alder Sauna Wood | Naturally warm hardwood ideal for sauna interiors - provides a smooth feel, low resin content, and comfort in high temperatures. |
| STS4 Nickel-Gap Profile | Subtle spacing between boards - creates a clean shadow line while allowing for natural expansion. |
| Tongue & Groove System | Interlocking board design - ensures secure installation and consistent panel alignment. |
| Wall & Ceiling Cladding | Designed for full surface coverage - delivers a seamless and uniform interior finish. |
| Performs in Sauna Environments | Withstands heat and humidity changes - maintains stability over time. |
| Smooth Planed Finish | Evenly surfaced boards for a refined look - enhances both comfort and appearance. |
| Consistent Tone & Grain | Fine, uniform texture - creates a balanced and cohesive visual style. |
| Durable & Stable Wood | Less prone to warping or shifting - supports long-term performance. |
| Easy Installation | Precision-cut boards fit together smoothly - simplifies setup and reduces effort. |
| Ideal for Sauna Interiors | Combines function and aesthetics - perfect for both modern and traditional sauna designs. |
Why Select Alder STS4 Cladding for Your Sauna Interior?
Three reasons sauna builders prefer Alder for clean wall and ceiling finishes.
Stable in High Heat
Alder performs reliably in elevated temperatures. Its stable structure helps reduce warping and movement - keeping panels straight and evenly aligned over time.
Resists Moisture Changes
With low resin content and balanced moisture response, Alder handles humidity well. This supports long-term durability and consistent performance in sauna conditions.
Clean, Timeless Look
The STS4 nickel-gap profile adds subtle shadow lines and depth. Paired with Alder’s warm tone and smooth surface, it creates a refined and cohesive sauna interior.
Specifications
What's Included
- Alder 1×4 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.
Why Thousands of Health and Fitness Lovers Choose
Them
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
