Putting insulation in a bathroom, behind shower

[eichelman]

Does this make any sense? I am changing a central, no exterior walled laundry room into a bath room with a shower. I removed the walls, and found insulation, because this was a remodel long ago!

I like the idea of putting back the old insulation in order to reduce sound, because the bathroom ajoins a dining room. But I dont want problems with mold. I plan on using all green board for the walls, and putting in shower walls that mount directly to the studs.

What do you think?
Fred

[joed]

Mold won't be a problem if no water gets in there. Water should not get in there. If it does then it won't matter if there is insulation or not. You will have a problem.

[Fischer]

You should put a continuous vapor barrier on the inside of the bathroom walls. Dining room side no vapor barrier. If you decide to use faced paper in the walls, still use a vapor barrier. If you have a water problem down the road, it will be contained on the inside of the bathroom (visable) as opposed to rot in the walls.

Cheap insurance.

[eichelman]

OK, Im now thinking of putting a 1/8 inch tile board between the acrylic shower wall and the studs. Should I also put in a plastic water vapor barrier, if so where? (The tile board is to give extra protection for the back side of a fuse box that opens up into the other room (NOT the bathroom :alberteinstein:)

[Fischer]

OK, Im now thinking of putting a 1/8 inch tile board between the acrylic shower wall and the studs. Should I also put in a plastic water vapor barrier, if so where? (The tile board is to give extra protection for the back side of a fuse box that opens up into the other room (NOT the bathroom :alberteinstein:)

You won't need anything behind an acrylic shower (if this is a seamless enclosue). Above the shower walls, you should have studs, then vapor barrier, then tile backer or rock.