2025-10-11
Outdoor saunas blend natural scenery with heat therapy, becoming a sought-after leisure space. However, they require weather-resistant and durable designs—here’s the condensed English guide.
I. Core Materials
1. Structural Wood
Nordic Red Pine (kiln-dried): Resin-rich with low thermal conductivity, 12-15% moisture content to prevent cracking.
Canadian Hemlock: Dense and stable for frames; requires ACQ treatment (compliant with outdoor wood preservation standards). Many premium saunas use it—check hemlock sauna models.
2. Insulation & Waterproofing
Insulation: XPS boards (water absorption <1%, 50-70mm thick) or glass wool wrapped in waterproof membranes.
Waterproofing: Asphalt shingles (wind-resistant up to Level 8) or metal roof panels; use silicone sealant (-40℃ to 150℃) for joints.
3. Heating & Safety
Heating: IPX4-rated far-infrared panels (compact and safe) or 304 stainless steel biomass stoves.
Safety: 10mm+ fireproof cotton around heaters; rubber anti-slip mats.
4. Foundations
Fixed: C25 concrete (10-15cm thick, 20cm larger than sauna base) with anchor bolts.
Movable: 10cm anti-corrosion wooden beams + 15cm cement blocks.
II. 4-Step Build Process
1. Planning
Size: 2-3 people (3㎡), 4-5 people (5㎡); height 2.2-2.4m.
Location: 5m from buildings, avoid low-lying areas (dig 30cm drains); prioritize privacy/views.
2. Foundation & Frame
Excavate 20cm (below frost line in cold regions), add gravel + C15 concrete base.
Build wood frames (8cm×8cm) fixed to concrete; erect 10cm×10cm wall posts.
3. Insulate & Panel
Fill wall/roof gaps with XPS; cover roofs following waterproof membrane installation guidelines.
Nail anti-corrosion wood panels (5mm gaps for thermal expansion).
4. Install Equipment & Test
Mount far-infrared panels 1.2-1.5m high (with fireproof cotton); add 16A leakage protectors.
Test: Simulate rain for leaks; run heaters 30 mins to check safety.
III. Use & Maintenance
Wood: Apply outdoor wood oil every 3-6 months; sand blackened areas.
Equipment: Check electric connections monthly; clean biomass stove ash after use.
Daily Use: Preheat 15-20 mins, keep vents slightly open; air out post-use.
For certified materials or prefabricated options, refer to sauna industry best practices.
