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Questions on isolation of doors in staggered stud walls

2128 Views 5 Replies 2 Participants Last post by Ted White, Feb 11, 2010

LewisCobb

Discussion Starter · Feb 11, 2010

Hi -

I'm currently looking at some sound isolation possibilities for my future basement theater. Until such time I have the time (and money) to start the build, I figured I'd get all the planning in place. This has led me to puzzling over sound isolation with existing structural walls. I am planning to isolate those walls with staggered studs and risc-04 clips but there's still something that's unclear to me.

The following render shows the situation -

The wall on the left is a 2x6 carrying wall for the entire house and it already has 2 doors that are framed into it. The other side of this wall is a finished room.

The wall on the right at 90 degrees to the previous wall is a stairwell to upstairs. It's 2x4 and the other side is a finished stairwell.

The opening shown between the 2 walls is about 41" wide and I am planning a 32" door in there with the framing etc.

If I was to stagger stud the wall on the left as well as the one on the right with offset studs and -04 clips, I am puzzled about how I might continue the decoupling theme for the new door. I can see how to fasten the jamb to a couple of decoupled studs in between the existing ones on the left in the 2x6 wall, but on the right, it has to fasten to the end of the existing wall that's "hard" into the framing of the house.

Questions -

1) Is there any obvious ways to accomplish the decoupling of the new door in this situation?

2) Perhaps it's a waste of time given that the other 2 doors on the 2x6 wall are framed into the existing structure and probably can't be decoupled anyway?

Thanks

Lewis

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Ted White

· #2 · Feb 11, 2010

Great diagram.

The DC-04 clips are primarily for double stud wall construction. If you were to build new 2x4 walls inside the perimeter of existing walls.

In your case, you would simply modify the existing single stud walls to staggered: http://www.soundproofingcompany.com/..._construction/

No use for the DC-04 clips in this scenario.

The doors create a great big acoustic hole, so having so many may defeat your decoupling efforts.

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LewisCobb

Discussion Starter · #3 · Feb 11, 2010

Quote:
Originally Posted by Ted White /forum/post/18115776

Great diagram.

The DC-04 clips are primarily for double stud wall construction. If you were to build new 2x4 walls inside the perimeter of existing walls.

In your case, you would simply modify the existing single stud walls to staggered: http://www.soundproofingcompany.com/..._construction/

No use for the DC-04 clips in this scenario.

The doors create a great big acoustic hole, so having so many may defeat your decoupling efforts.

Hi Ted !

I was going to e-mail you with this issue but then figured I would toss it up here and not torment you any more than I have

I have seen some staggered stud walls with the offset studs and the -04 clips in my travels on the PAC website, that's why I figured they should be used in this situation.

I'm not looking for a "dome of silence" but want to plan to make the room as quiet as practical given my existing situation. I am going to replace the doors with solid core ones at a minimum, and can seal the edges with a floor threshold as well. Is there a preference for the side of the door to apply an additional layer of mdf with respect to the swing of the door (i.e. hinge side or other) ?

Thanks,

Lewis

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Ted White

· #4 · Feb 11, 2010

Quote:
Originally Posted by LewisCobb /forum/post/18115879

...and not torment you any more than I have

Certainly no torment on this end...

I have seen some staggered stud walls with the offset studs and the -04 clips in my travels on the PAC website, that's why I figured they should be used in this situation.

Given the extreme use of clips it's not practical.

I'm not looking for a "dome of silence" but want to plan to make the room as quiet as practical given my existing situation. I am going to replace the doors with solid core ones at a minimum, and can seal the edges with a floor threshold as well. Is there a preference for the side of the door to apply an additional layer of mdf with respect to the swing of the door (i.e. hinge side or other) ?

If you had planned to use damped surfaces, they would be best placed on the sound-producing side of the wall.

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LewisCobb

Discussion Starter · #5 · Feb 11, 2010

Quote:
Originally Posted by Ted White /forum/post/18115960

If you had planned to use damped surfaces, they would be best placed on the sound-producing side of the wall.

ok - that answers my question. I'm going to be going with DD/GG as much as practical when I do the build so I'll put the mdf on the theater side of the doors. This will mean I have to adjust the size to clear the seals etc. and end up with a small gap all around, but that's not an issue for me.

Thanks Ted,

Lewis

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Ted White

· #6 · Feb 11, 2010

You have good questions, Lewis. Keep in mind that for every person that posts questions, there are dozens if not hundreds that read and don't ask. They are asking vicariously through you!

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