Insulating my inside walls, vabor barrier or not?

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Old 04-10-19, 01:21 PM
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Insulating my inside walls, vabor barrier or not?

Putting insulation in my new addition walls to deaden the sound, I believe R-13 should do it. Would I use faced insulation or non faced?
 
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Old 04-10-19, 01:54 PM
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For exterior walls use a faced insulation with the vapor barrier toward the side that's warm in winter. For interior walls use bare non-faced insulation. An insulation like rock wool is better for sound control than fiberglass.
 
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Old 04-10-19, 03:40 PM
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It doesn't matter which you use since the kraft paper won't hurt anything on interior walls. It's not "needed" but if you like to staple it up the kraft facing helps with installation. Either way, you want a tight fit. If unfaced insulation falls out you've cut it too loose.
 
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Old 04-11-19, 05:32 AM
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Thanks for all the help guys...
 
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Old 04-11-19, 08:29 AM
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My experience is that R13 fiberglass does nothing for noise.

Have used Soft touch for internal walls, does great, never tried rock wool!
 
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Old 04-14-19, 08:58 AM
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I mostly wanted to insulate my inside walls for a little extra heating protection between rooms and air infiltration, it kinda takes care of any little drafts you may get in your inside walls, I live in a cold and windy area. Another question that I wanted to ask was I put 4' faced batts in my ceiling, at the seams where they are butted together, do I have to use vapor barrier tape or can I tape the seams with tyvek or duct tape?
 
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Old 04-14-19, 09:42 AM
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wanted to insulate my inside walls for a little extra heating protection between rooms
Insulating interior walls of a conditioned space does nothing beneficial!

do I have to use vapor barrier tape or can I tape the seams with tyvek or duct tape?
You don't need to, the batts should be pressed close enough that they touch, I doubt any tape would survive long in a hot attic environment!
 
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