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Unread 02-24-2006, 11:22 AM   #1
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Location: Tulsa, OK
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Insulation on interior wall behind Kerdi?

We are getting ready to hang the drywall for our new shower/bathroom. We are making a 48x48 shower with the full Kerdi system (pan and all). One of the walls is common to the master bedroom and while the plumbing isn't running through that wall, I am wondering if adding some insulation in that wall cavity could help with noise in the bedroom while someone is showering.

Am I introducing moisture concerns if I add bat-type insulation between those two interior walls, knowing that a Kerdi shower sits on one side? Would insulation even help with noise? I suppose a second layer of drywall might have been more effective for noise issues, however, I cannot add that now due to the framing I've already done.

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Unread 02-24-2006, 11:40 AM   #2
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Right up my alley Jenni.

Did a lot of research on reducing sound transmission when I was framing out my basement. Adding insulation will help a little but don't expect wonderous results. As you suspect adding a 2nd layer of drywall would provide far more benefit. If there's any way to add a 2nd layer then, by all means, go for it.

Even so, I'd still add the insulation. Since you are doing Kerdi the moisture stops there and you won't have any moisture issues within the wall. Play it safe though and use unfaced insulation, or use faced but slice up the facing.


If I recall correctly my memory is excellent, but my ability to access it is intermittent.
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Unread 02-24-2006, 12:57 PM   #3
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I'm getting ready to tackle a new tile shower (just got John's book in the mail yesterday) right off the master bedroom as well and was hoping to do the exact same thing.

I found a websight:


interesting stuff, though I haven't tried any of it yet. It appears that insullation will only get you part of the way, as a lot of sound is transmitted throught the 2x4's in direct contact with the drywall. They sell some products to put between the studs and the wallboard.

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Unread 02-27-2006, 01:24 PM   #4
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As "luck" would have it...

I was (err....)"doublechecking" my husband's framing work and realized that I can squeeze in another layer of dywall against the bedroom wall. When the extra layer is installed, the drain will be exactly centered in the opening. Wasn't that sweet of him to give me one less thing to worry about?

That should work well...

Thanks for the responses!
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