Jay C. White Cloud wrote:Hi Gilbert,
Of all the advice given, (and this being a traditional-natural building forum) I would say the main thing you need is good ventilation. There are several ways to do that, but without wall interstitial schematics and other knowledge about the building and your skill sets I can't really go farther. Ventilation is number one.
Chelle's advice is spot on and I have build several like that. If you have a masonry wall and the skill sets to embrace the work required, greenhouse, solarium or vivarium bathrooms are the very best. Some I know of become the favorite place in the house. Plants, moving water and air can really inhibit "bad molds" and promote a more natural system. Anyone that has spent time inside a nice green house knows just how pleasant they are.
Personally I would stay as far away from many of the mainstream commercial building products like wall board, cement board, and the like. I would support the use of NHL5, cob, natural cements, stone, tile, and several forms of AAZPA approved epoxies to make certain things if the design required it.