HARVIA 20 Pro Wood Stove in 400x320cm Garden Sauna Build – Layout and Progress Updates

The discussion centers on the construction of a garden sauna with external dimensions of 400x320 cm and an internal sauna space of 300x200 cm, designed to accommodate four lying places. The sauna is heated by a wood-fired stove, specifically the HARVIA 20 Pro initially purchased at a discounted price, later replaced or supplemented by a HARVIA 17 kW stove. The structure uses pine for external walls and frame, spruce for internal walls, and aspen for benches, with plans to install OSB board flooring. Key construction considerations include proper insulation with mineral wool, fire safety, and effective smoke extraction using insulated steel pipes with fireproof materials. The floor must be wooden rather than tiled to avoid excessive heat retention. Temperature regulation in wood-fired saunas is managed primarily through ventilation control and stove operation, with some users noting challenges in maintaining desired temperatures. Ventilation design includes air intake from outside and exhaust through a chimney, with attention to draft issues. Alternative heating methods such as infrared heaters and electric stoves were discussed but wood stoves remain preferred for outdoor saunas. Additional advice covers mosquito control (e.g., bat boxes), use of deciduous woods (poplar, aspen) for interior surfaces, and avoiding metal elements inside the sauna except for the stove. Some users shared experiences with sauna dimensions, insulation thickness (5-10 cm mineral wool), and structural materials like Scandinavian spruce. The discussion also touches on the feasibility of unconventional sauna structures such as concrete cellars or tin plate cabins, with concerns about ventilation, insulation, and durability. Photos and progress updates were shared, illustrating construction stages and interior layouts.
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