Finnish Sauna Builders Carbon Smart Sauna Kit - 4 × 4 × 8 ft

The Finnish Sauna Builders Carbon Smart sauna room kit supplies pre-cut interior components for a 4 × 4 × 8-foot room. Thermo Poplar boards and configurable benches create a coordinated wood interior.

Why This Product Stands Out

• Pre-cut interior boards and trim.
• Thermally modified Poplar construction.
• Configurable bench layouts.
• All-glass door and sauna accessories.

Who This Is For

For homeowners or contractors fitting out an indoor sauna room, with framing, insulation, electrical wiring and exterior wall covering supplied separately.

Key Features

• Interior kit: Includes foil vapor barrier, 1 × 4 tongue-and-groove wall and ceiling boards, clear bench boards with supports, backrests, matching corner moldings and duckboard flooring.
• Bench layouts: Choose a configuration with 20-inch-deep benches.
• Door and ventilation: Includes an all-glass door with wood handles and trim, plus upper and lower vent grills.
• Accessories: A bucket with liner and ladle, thermometer, headrest and marine-grade wall-mounted vapor-proof light complete the kit.
• Thermo Poplar: Chemical-free thermal modification at approximately 374°F improves dimensional stability and resistance to humidity and temperature changes.

Specifications

• Brand: Finnish Sauna Builders
• Series: Carbon Smart
• Product type: Indoor sauna interior kit
• Listed room size: 4 × 4 × 8 feet
• Wood: Thermo Poplar
• Wall and ceiling boards: 1 × 4 tongue and groove
• Bench boards: Clear 1 × 4 with supports
• Bench depth: 20 inches
• Door frame: 27.2 × 78.7 inches / 690 × 2000 mm
• Door glass: 24.4 × 77.3 inches / 620 × 1963 mm
• Frame thickness: 1.65 × 3.6 inches / 42 × 92 mm
• Door rough opening: 28 × 80 inches
• Recommended ceiling height: Eight feet per manufacturer safety and clearance guidelines
• Heater choices described in source: Harvia KIP45B 4.5 kW with built-in controls; Harvia KIP45W 4.5 kW with Wi-Fi controls; HUUM Cliff Mini 3.5 kW with Wi-Fi controls
• Heater stones: Included with listed heater options
• Protective railing: Listed with HUUM Cliff Mini only
• Installation instructions: Included
• Customer-supplied components: Framing, insulation, electrical wiring and exterior wall covering

The kit includes an all-glass door, not a full glass wall. Backrests ship flat; on-site spacers can create an angled backrest. Wall boards normally run horizontally; where room width exceeds eight feet, an interior seam joins boards. Follow the recommended ceiling height and manufacturer clearance guidelines.