re: #732 Teukka

Rockwool and glass fiber wool aren’t that harmful provided you use them properly and in a way which contains the fibers if there is a hole in the wall etc. Post-construction cleaning is also key.

As to plaster, NOPE!, I would go with 2 layers of drywall, one of the fire rated variety. On each side of the rockwool.

Is “rockwool” basically asbestos? Hideous shit. Especially dangerous to construction workers who don’t have appropriate breathing apparatus supplied by their employers.