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Soundproofing Forum Topics => Soundproofing Windows and Doors => Topic started by: sbkim on August 16, 2012, 02:59:36 PM

Title: Gap around window frame
Post by: sbkim on August 16, 2012, 02:59:36 PM
Hello,

Drywallers recently finished and due to last minute insulation work around the windows, they left a gap of little less than 1" around windows.  Although it's packed with foam and fiberglass, I am concerned with this gap.  I was hoping it was smaller so I can run a bead of acoustical sealant.  So what are my options other than having them re-do this?  Builder thinks it's ok since it will be covered by window casing.

My thoughts were perhaps use backer rod and seal with acoustical selant or perhaps use some vinyl tape?

Thank you!
Title: Re: Gap around window frame
Post by: Randy S on August 16, 2012, 03:01:21 PM
Backer rod or square and then caulk is the correct approach.
The goal is the air tight seal prior to molding.
Title: Re: Gap around window frame
Post by: sbkim on August 16, 2012, 03:12:04 PM
Backer rod or square and then caulk is the correct approach.
The goal is the air tight seal prior to molding.

Good gawd that was quick!  Thanks Randy.  Any thoughts on using vinyl nitrile tape to cover up everything afterwards or is that an overkill. 
Title: Re: Gap around window frame
Post by: Randy S on August 16, 2012, 03:21:06 PM
Did you use MLV on your walls?
Title: Re: Gap around window frame
Post by: sbkim on August 16, 2012, 03:37:40 PM
No I didn't. 
Title: Re: Gap around window frame
Post by: Randy S on August 16, 2012, 03:47:28 PM
You could the tape ...no such thing as overkill but I dont think it will make much of a difference as long as you make sure you fill the space between the rough frame and door jamb with insulation before you seal off both sides...air tight.
Title: Re: Gap around window frame
Post by: sbkim on August 16, 2012, 04:17:44 PM
Got it.  Just didn't know how add mass/density to this cavity without spending arm and leg or redo'ing drywall.  Hopefully, properly sized closed cell backer rod/square + acoustical sealant could do the trick.   Do I also need to put caulk around the trim/window casing?  Thanks!
Title: Re: Gap around window frame
Post by: Randy S on August 16, 2012, 04:40:38 PM
your mass value is only the drywall mass....so creating an air tight seal with absorption in the cavity will be just fine..we normally spec 1/4" around door jambs to be filled with caulking in most every job we do. :)

Always try to caulk around all penetrations even outlets and switches. :)
Title: Re: Gap around window frame
Post by: sbkim on August 16, 2012, 05:27:01 PM
Again, thank you Randy for that practical advice! 
Title: Re: Gap around window frame
Post by: sbkim on August 16, 2012, 08:57:52 PM
I met with the drywall folks and now the are offering to cover up this gap using cement plaster (i presume "mud").  Now I have  a dilemma - do I have them do this and then apply acoustical  sealant whatever gaps there may be or still go with my original idea of backer rod?  I am curious how strong this plaster is and how well it will hold up in a large gap like this...
Title: Re: Gap around window frame
Post by: Randy S on August 16, 2012, 09:18:15 PM
well.....plaster can crack if done wrong...at least if you did the caulking two things would be for sure...no leaks and no cracks because acoustical is not hardening..
Title: Re: Gap around window frame
Post by: sbkim on August 17, 2012, 02:06:53 AM
Great point...