u/Different_Baseball20

Hello all. I am currently in the planning phase for my outdoor sauna. Is a slightly vaulted ceiling a no no or would a 4/12 pitch on ceiling be okay? I know for purists, flat is recommended. Would a slightly vaulted ceiling pitch have significant effect on my loyly?

Rough internal dimensions will be 8 ft walls, 7 feet deep and 8 feet wide including wall thickness. Plan on 12 kw heater and insulating floor, ceiling, and walls well. Glass front.

Thanks in advance.