Insulation, Radiant and Vapor Barriers - Interior walls and vapor barriers

Hello,

I just purchased a bunch of insulation for doing my interior walls (new house). Now after reading through the forums I am finding out that I do not need the vapor barrier for interior walls. I was wondering what kind of issues I could run into if I install the insulation with the vapor barrier on my interior walls. Would this be against code?. I am insulating 3 bedrooms, 2 bathrooms, 1 utility room. Would using this insulation in the bathrooms be fine if I faced the barrier towards the inside of the bathroom?

I could alwasys return it but that would be a pain in the butt. Plus I though the insulation with the facing would be easier to install.

I want to insulate my interior walls for sound.

Any suggestions would be great!

Thanks!

No go and use it no problem!

Thanks for the info!

Are their any rules or giudlines I should follow?

I would imagine for the bathrooms I would want the vapor barrier facing the bathroom.

Any other suggestions or tips when doing this?

Thanks!!

If there is green board in the bathroom, you would not want to use faced insulation there. See http://forum.doityourself.com/showthread.php?t=251579

I believe they use standard sheetrock in the bathrooms.

I just rmembered I can use the some of the insulation I already purchased in the garage. That would leave me with about 300 sq feet with the vapor barrier. Were would you recomend I use up the 300 sq ft. left over? Bathroom, bedrooms or utility room?

Sorry for all the questions.

This is my first house and I don't want to make any dumb mistakes that will cost me more in the long run.

Thanks!!

The only reason many people have for insulating interior rooms is for sound dampening. If that's your goal, you should think of which rooms you want to improve the sound dampening in. Many people choose to do the bathroom walls, maybe any shared walls their bedroom has with other rooms, or perhaps the walls adjoining the room your washer/dryer is in. I'd say the priority would be 1) bathroom 2) bedroom 3) utility. But its up to you, its your house! ;)