Julia Diamond wrote: My question is, what are good natural alternatives to sheet rock, backerboard, tape and mud.
MgO board is a cementitious wall board ideal for those with chemical sensitivities.
It is non-toxic, VOC-free, and a very impervious to mold. If you have a wood-framed
wall it will be easy to attach the board to that. Good brands are Dragonboard, Mag Board and Magnum Board
You can plaster, paint or tile over MgO walls. Here are some tips on using plaster.
If not painting, the MgO boards would need to be primed.
Somebody else mentioned no tile next to exterior wall so I will skip the tile on that wall and stucco with a lime wash.
I have a question. I converted a garage into a guesthouse in los Angeles. For the bathroom walls including surrounding the tub, we just "stuccoed" over the drywall--just like you would with exterior stucco-flashing, chicken wire and then three coats (brown, scratch and top coat) and then I painted with old fashioned oil based enamel paint on that--12 years later its still beautiful and impermeable