http://www.cedarbrooksauna.com/how-to-build-a-sauna-convert-room.html
Follow these steps and videos to convert an existing room into a sauna
This informational article and videos demonstrate how to tack up your sauna foil, attach cedar paneling to the interior of your studs, mount your sauna heater, install your sauna benches, hang your sauna door, and finish trim and entry walkway.