When I first moved into a place a few years back, the entire shower wall was rotting and moldy. I tore the wall apart. Made sure to make the area well ventilated and to wear breathing masks rated for work like that.I then had to to take a heat gun to the remaining intact wood and dry everything out completely if I didn't want the moisture to start mold on the new wall.I reccommend that you don't seal the mold in too tightly with those bags of yours. I know it's not good if the spores are all over your house air supply, but sealing the mold in can create more problems. Namely, condensation, which speeds up the rotting process and allows the mold to spread faster.