Hello! I have an interior sauna that unfortunately was built without ventilation (🤦‍♂️), which I'm trying to correct now. I could use your advice on where to place vents. Currently there is a shower immediately behind the heater wall, which makes the traditional placement of under or above the heating unit difficult. So I was thinking of placing the incoming air in the wall next to it, but I'm worried this might not work as expected. What do you think? Thank you!

Does anyone have recommendations for Aluminum vapor barrier brands or products in the US?

If you have a barrel or cabin sauna. Have you treated the exterior? And with what? I am trying to decide if I should cover the exterior of my cabin sauna with 1.5 inch insulation and LP siding or just stain it every year. I am worried the boards may warp or open up over time. Also a simple 2 x 6 is only rated at about R-5 insulation. Anyone had issues when its 0 deg outside?

I have a barrel sauna, with a full diameter glass wall behind the electric heater. I have upper and lower ventilation ports on the entry wall, opposite to the heater. Air exchange is ok, but I am wondering if it can be improved further. Based on info here and elsewhere, a low vent port behind the heater would be the final addition, but that's impossible with the glass wall. I am thinking about putting a vent on the floor just to the left of the heater, red spot on the attached pic. I guess it wouldn't do harm, since i will be able to close it if need be. Thoughts?