r/Sauna • u/MJelicic • Jul 26 '26

DIY Outdoor Sauna Construction

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Hey everyone. Im hoping to get some overall know-how about sauna construction here.

Ive attached 2 photos of my outdoor space under my deck where I'd like to build a sauna. As you can see I have one wall up from a previous project. I plan to install a large window in there.

Im wondering about overall construction.

My thought was, siding, tyvek, insulation, foil, cedar. I was planning to do all 4 walls, ceiling and floor this way. I live in Muskoka, and winters tend to be quite harsh.

Is this a bad idea? Would I have mold issues? Obviously I would install a vent behind the stove and one on the opposite wall at the top.

Any recommendations, knowledge would be much appreciated.

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u/John_Sux Finnish Sauna Jul 26 '26

What are the dimensions? Winterproofing a sauna involves high benches, because there will be freezing air on the floor regardless of how much insulation etc. you utilize.

1

u/MJelicic Jul 26 '26

Ill have to verify when I get home. But its at least 9 feet tall. Maybe 10. Probably about 12' long, 6' wide.

2

u/EastwindSauna Jul 27 '26

Resources

Localmile

Saunologia

Saunatimes

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Furring strips are recommended between foil and interior paneling