Finnish Sauna Builders
Finnish Sauna Builders Carbon Smart 8' x 9' x 8' Indoor Sauna Kit | Thermo Poplar
Finnish Sauna Builders Carbon Smart 8' x 9' x 8' Indoor Sauna Kit | Thermo Poplar
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Create an inviting, custom-built sauna retreat with the Finnish Sauna Builders Carbon Smart 8' x 9' x 8' Indoor Sauna Kit. Designed for residential wellness spaces and commercial sauna installations, this premium traditional sauna kit combines thermally modified Thermo Poplar wood, customizable bench configurations, and carefully selected interior components for a refined sauna experience.
Unlike a prefabricated sauna cabin, the Carbon Smart Indoor Sauna Kit is designed to finish a properly prepared room. Its precut Thermo Poplar tongue-and-groove boards, matching benches, trim, and accessories provide the materials needed to create a cohesive sauna interior. You supply the framing, insulation, electrical wiring, and exterior wall covering, giving you greater flexibility over the finished space.
The Carbon Smart collection also offers a choice of compatible Harvia electric sauna heaters, including WiFi-enabled models and a combination heater with steam functionality. Whether you're creating a private home sauna or outfitting a dedicated wellness facility, this 8' x 9' sauna kit offers a balance of traditional sauna craftsmanship, customizable design, and modern heating options.
Key Features
8' x 9' x 8' Sauna Room Configuration
Designed for an indoor sauna space measuring 8 feet by 9 feet with an 8-foot ceiling height.
Premium Thermo Poplar Construction
Features thermally modified Poplar wood throughout the interior wall boards, ceiling boards, benches, moldings, and duckboard flooring.
Thermally Modified Wood
Thermo Poplar undergoes a heat modification process at approximately 374°F to enhance dimensional stability and resistance to changing temperature and humidity conditions.
Customizable Bench Layouts
Select a bench configuration that complements your room layout and preferred seating arrangement.
20-Inch-Deep Sauna Benches
Includes Thermo Poplar bench boards and supports, custom-built for the selected configuration.
All-Glass Sauna Door
A full-glass door with wood handles and trim creates a clean, contemporary entrance while complementing the natural wood interior.
Foil Vapor Barrier Included
The kit includes a foil vapor barrier for moisture management within the sauna construction.
Integrated Ventilation Components
Upper and lower ventilation grilles are included to support the sauna's planned air circulation.
Traditional Sauna Accessories
Includes a sauna bucket with liner, ladle, thermometer, headrest, and wall-mounted sauna light.
Optional Harvia WiFi Sauna Heaters
Choose from compatible Harvia Cilindro, Club, Virta, and Virta Combi electric heaters, or select the kit without a heater.
Optional Interior Upgrades
Available accessory configurations include bench skirting, LED under-bench lighting, or a combined luxury package.
Product Specifications
Brand: Finnish Sauna Builders
Collection: Carbon Smart
Product Type: Traditional Indoor Sauna Room Kit
Room Dimensions: 8' W x 9' D x 8' H
Recommended Ceiling Height: 8 Feet
Primary Wood Material: Thermo Poplar
Wood Modification Temperature: Approximately 374°F
Wall and Ceiling Boards: 1 x 4 Tongue-and-Groove Thermo Poplar
Bench Material: Thermo Poplar
Bench Depth: 20 Inches
Bench Configuration: Customizable
Interior Trim: Thermo Poplar Corner Moldings and Baseboards
Door Type: All-Glass Sauna Door with Wood Handles and Trim
Door Frame Dimensions: 27.2" x 78.7"
Glass Dimensions: 24.4" x 77.3"
Door Frame Thickness: 1.65" x 3.6"
Required Door Rough Opening: 28" x 80"
Flooring Component: Thermo Poplar Duckboard Flooring for Walk Area
Ventilation: Upper and Lower Ventilation Grilles
Lighting: Marine-Grade, Wall-Mounted, Vapor-Proof Sauna Light
Heater: Optional, Selected Separately
Installation Type: Indoor Room Build-Out
Premium Thermo Poplar Wood Construction
Thermally Modified Poplar
Carbon Smart sauna interiors are crafted from Thermo Poplar, a wood material that undergoes a controlled heat treatment process at approximately 374°F.
Dimensional Stability
The thermal modification process improves the wood's resistance to dimensional changes associated with heat and humidity.
Rich Natural Appearance
Thermo Poplar develops a warm, rich wood tone that complements both traditional and contemporary sauna interiors.
Chemical-Free Thermal Modification
The manufacturer describes the modification process as using heat rather than chemical wood treatments.
Coordinated Interior Finish
Matching Thermo Poplar components provide a consistent appearance across the walls, ceiling, benches, moldings, and walk-area flooring.
Available Harvia Sauna Heater Options
No Heater
Choose this configuration when purchasing the Carbon Smart sauna interior kit without a heater.
Harvia Cilindro 11kW WiFi
An 11kW electric sauna heater with WiFi-enabled controls and heater stones included.
Harvia Club 10kW WiFi
A 10kW electric sauna heater with WiFi-enabled controls and heater stones included.
Harvia Virta 10.5kW WiFi with Railing
A 10.5kW electric sauna heater featuring WiFi-enabled controls, heater stones, and a protective railing.
Harvia Virta Combi 10.5kW WiFi with Railing
A 10.5kW combination electric sauna heater with WiFi-enabled controls, heater stones, protective railing, and integrated steam functionality.
Important Heater Selection Information
The sauna heater is not included when the No Heater option is selected. Heater stones and railings are included only with the applicable heater configurations. Electrical requirements, installation clearances, and heater suitability must be confirmed before installation.
Optional Accessory Packages
No Accessories
Includes the standard sauna kit components without the optional interior upgrades.
Bench Skirting
Adds decorative bench skirting for a more finished interior appearance.
LED Under-Bench Lighting
Adds LED illumination beneath the sauna benches.
Luxury Package
Combines bench skirting with LED under-bench lighting.
Optional accessory packages must be selected when configuring the sauna kit.
What's Included
Thermo Poplar Wall and Ceiling Boards
Precut 1 x 4 tongue-and-groove boards for the specified sauna room configuration.
Thermo Poplar Benches
20-inch-deep bench boards and supports, tailored to the selected layout.
Ergonomic Backrests
Backrests supplied flat for installation and optional on-site adjustment.
Thermo Poplar Moldings
Matching corner moldings for walls, ceiling, and baseboards.
All-Glass Sauna Door
Glass door with wood handles and trim.
Foil Vapor Barrier
Foil vapor barrier material for the sauna construction.
Thermo Poplar Duckboard Flooring
Duckboard flooring for the designated walking area.
Ventilation Grilles
Upper and lower vent grilles.
Traditional Sauna Bucket and Ladle
Sauna bucket with liner and matching ladle.
Sauna Thermometer
A thermometer for monitoring sauna temperature.
Headrest
A headrest for added comfort during sauna sessions.
Sauna Light
Marine-grade, wall-mounted, vapor-proof sauna light.
Installation Instructions
Detailed assembly instructions for the sauna kit.
Selected Heater and Upgrades
Harvia heater equipment and optional accessory packages are included only when the corresponding configurations are selected.
Installation Requirements
Prepare the Room Structure
The Carbon Smart sauna kit requires suitable framing, insulation, electrical wiring, and exterior wall covering. These structural and electrical materials are not part of the standard interior kit.
Confirm Room Dimensions
The kit is designed for an 8' x 9' room with an 8-foot ceiling height. Confirm final construction dimensions before installation.
Install the Vapor Barrier
Install the included foil vapor barrier according to the manufacturer's construction instructions.
Install the Wood Interior
Fit the precut Thermo Poplar tongue-and-groove boards, ceiling materials, and matching trim within the prepared room.
Configure the Benches
Assemble and install the benches according to the selected layout.
Install the Sauna Door
Provide the specified 28" x 80" rough opening for the included all-glass sauna door.
Install Ventilation Components
Position the upper and lower ventilation grilles according to the installation instructions and selected heater requirements.
Complete Electrical Installation
Have a qualified electrician install the sauna heater and electrical lighting in accordance with applicable codes and manufacturer requirements.
Install Optional Accessories
Fit selected bench skirting, LED under-bench lighting, and other configuration-specific accessories according to their instructions.
Inspect Before Use
Verify that the heater, ventilation, lighting, benches, and door operate safely before using the sauna.
Care and Maintenance
Clean the Wood Surfaces
Wipe benches and other accessible interior surfaces using cleaning products approved for sauna wood.
Allow the Sauna to Dry
Provide appropriate ventilation after sessions to help moisture dissipate.
Protect the Thermo Poplar Finish
Avoid harsh chemicals, abrasive cleaning tools, and unnecessary standing water on the wood surfaces.
Maintain the Benches
Inspect the bench boards, supports, and fasteners periodically.
Clean the Glass Door
Use a glass cleaner suitable for the door and surrounding wood trim.
Inspect Ventilation Grilles
Keep ventilation openings unobstructed and free from accumulated debris.
Maintain the Sauna Heater
Follow the maintenance and sauna stone inspection requirements for the selected Harvia heater.
Inspect Electrical Components
Have qualified personnel inspect damaged or malfunctioning electrical equipment.
Frequently Asked Questions
Is the Carbon Smart 8' x 9' x 8' Sauna Kit a complete freestanding sauna cabin?
No. It is an indoor sauna room kit designed to finish a properly prepared space. The package includes the specified interior wood components, benches, glass door, ventilation grilles, and sauna accessories. Framing, insulation, electrical wiring, and exterior wall covering must be supplied separately.
Does the Carbon Smart Sauna Kit include a heater?
A heater is optional. You can select the kit without a heater or choose from compatible Harvia Cilindro 11kW, Club 10kW, Virta 10.5kW, and Virta Combi 10.5kW WiFi models.
What type of wood is used in this sauna?
The sauna interior uses Thermo Poplar, a thermally modified wood selected for its dimensional stability, resistance to temperature and humidity changes, and warm natural appearance.
Can I customize the benches and lighting?
Yes. The kit offers customizable bench layouts and optional accessory packages, including bench skirting, LED under-bench lighting, and a combined luxury package.
What size room and door opening are required?
The sauna kit is designed for an 8' x 9' room with an 8-foot ceiling height. The included glass door requires a rough opening of 28" x 80". Confirm all final construction dimensions and heater clearances before installation.
