I want to build a quick little outdoor sauna up here in Canada, using just a simple tarp structure. What do I need for the heat source? Charcoal briquettes and rocks? Does anyone have any experience building one?
The rough saunas I have seen use a small steel (not cast iron) wood stove that heats a bunch of rock on top. A dipper is used to pour water on the rocks and make steam.
I would be careful about the rock though. Some forms absorb a lot of moisture and kind of explode when heated the first time.
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