I will be demolishing the old tile (and underlying lath and plaster) around
my bathtub, to replace it with cementboard and new tile. My living room is
on the other side of the wall, and I would like to install something to
reduce the sound transmission from the bathroom.
Any suggestions for appropriate materials and techniques?
I would insulate the walls with fiberglass batts (sound attenuating if
you can get them easily). also install the drywall on resilient
channel. both sides (bathroom and living room) is best, though this
might not be possible on the bathroom side. also, make sure that the
screws that hold the drywall to the resilient channel do not go through
the rc and into the stud--this will negate the effectiveness of the
channel. hold the drywall up from the floor by 1/4" +/- and fill this
gap with flexible caulk such as acoustical sealant. for stopping
bathroom sounds, this approach should be adequate. further reduction
can be had by using sound board.
Consider adding more studs between those already there, and adding a firring
strip on the outsides of each alternating stud, and then insulating between
the studs. When you put on the wallboard, each side will have its own set
of studs and the sound against one wall will not vibrate a stud that has
contact with the other wall.
No. They are good suggestions, but not do-able in my circumstances.
The tub is staying where it is, and I can't add another inch of thickness
to the wall surrounding it. The only soundproofing solutions I could
consider would be (a) stuff I can put inside the wall cavity and/or
(b) something really think I can put between the studs and the
I might add one thought. If this was a lath and plaster tearout
it is probably 3/4" thick. There used to be a fiber board called
Celatex that would deaden it some. It's 1/2" thick and drywall
1/2" thick would lose you only 1/4". Plain old fiverglass
insulation in the wall will help some but nothing I can think of
is going to help a lot. I don't even know if they still make
Celatex or not. If you haven't seen it, it looks like it was made
out of horseshit.
So what was wrong with the 1/4" ToughRock Sound Deadening Gypsum Board I
suggested? It works, on 1/4" thick, you overlay with 1/2" cement board and
your back to a 3/4" wall with excelent sound deading properties. (They
normally use this on Party Walls.)
You could also consider spray foam.
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