a few questions about finishing walls and accoustics

[mjfoster77]

Ok so I'm beginging to plan for my dedicated home theater room in the basement and I have been thinking about a few things that I want to bounce of some of the experts here. This is what I'm thinking. The room will be roughly 20 L X 13 W X 9 H. Now here is my delema, I was thinking of using Foam board insulation on the unfinishined concrete wall and then frame with 2X6's and pink insulation and maybe double drywall with green slime. My question is should I also use foam board on the three non concrete walls as well? I want to keep as much sound in the room as possible, without spending a fortune. Also I was looking on the green slime website and saw their noise proofing clips. ANyone used these or know someone who has? Are they effective?

When you double dry wall should you use different thickness sheets? I also have some duct work that will be in the room what the best way to sound proof that. ? Just stuff as uch insulation around it as you can?

Any suggestions would be appreciated thanks.

 

[bpape]

The foam board will do nothing for soundproofing. On the concrete, it's purely a heat insulator. Use pink in all the walls.

No need to use 2 different thicknesses. The more mass the better. 2 layers of 5/8 is best.

The clips can work very well. If you really want good isolation, use something like PAC International DC-04 clips to tie the walls to the joists above. Build the walls 1/2" short so they're not physically touching the joists and use the DC-04's every 2' around the perimeter.

Now that the walls are decoupled, you only need to do clips and channel on the ceiling.

Also, you'll need to pay very close attention to any openings in the room (outlets, switches, lights, HVAC, etc.) or all your effort is for naught.

Lastly, make sure you use a solid core wood door with a threshold and seals.

Bryan

 

[mperfct]

You can't add much more to what Bryan said. He knows a thing or two.

Here's a copy of my build thread. http://www.avsforum.com/avs-vb/showthread.php?t=758891 I used double 5/8"ths with green glue, like Bryan talked about.

I didn't decouple with clips, and am still pretty happy with the isolation. It's not perfect, but it was a fun project with a big payoff.

 

[Bryce_H]

Bryan covered most. If you search my username for posts here on audioholics you will find most of my build process. One of these days I will get a digital journal up.

 

[mjfoster77]

Mr Perfect my theater will roughly be the same dimensions as yours, how much green glue did you use on the project? Did you use what the recomend per sheet of drywall?

 

[mjfoster77]

I was just looking at those clips so you screw it to the joist and then screw it to the wall which is build 1/2 inch shorter. What's a good place to buy the clips? Oh and there seems to be different weight ratings to these, is the light weight one fine or would I need the heavy duty.

 

[lsiberian]

I was thinking when the time came I would use mineral wool instead of fiber.

Might be harder to find though.

 

[mperfct]

Mr Perfect my theater will roughly be the same dimensions as yours, how much green glue did you use on the project? Did you use what the recomend per sheet of drywall?

It's mperfct, as in imperfect, not Mr. Perfect.

I used two tubes per piece of rock, as such I used about 4 cases.

 

[bpape]

PAC DC-04's only come in one variety and are not designed to support weight. They're meant to provide a place to turn movement into a shearing force.

On the ceiling, again, if you do the PAC RSIC-1, it's only one rating. You just change how many you need per unit area if you go with 3 layers isntead of 2.

I have the clips available if you need them.

Bryan

 

[mjfoster77]

Bpape I was looking in the basement last night and noticed that a perimeter wall that runs parrallel with the floor joist has two air ducts that run the length of my room. I would guess the two ducts combined are over 4 ft wide. I couldn't be able to use the dc o4's there, is there a work around? I could take pictures if I didn't make it real clear. So the duct would affect the front and rear walls.

 

[mjfoster77]

It's mperfct, as in imperfect, not Mr. Perfect.

I used two tubes per piece of rock, as such I used about 4 cases.

ooppss. My eyes must have failed me, man I'm way to young for that? LOl

 

[bpape]

Bpape I was looking in the basement last night and noticed that a perimeter wall that runs parrallel with the floor joist has two air ducts that run the length of my room. I would guess the two ducts combined are over 4 ft wide. I couldn't be able to use the dc o4's there, is there a work around? I could take pictures if I didn't make it real clear. So the duct would affect the front and rear walls.

Do you have a couple of pics so I can see what's happening? There are ways around the ducting and still allow for the isolation depending on how things are laid out.

Bryan

 

[mjfoster77]

Do you have a couple of pics so I can see what's happening? There are ways around the ducting and still allow for the isolation depending on how things are laid out.

Bryan

I took some pics I'll try and get them up tonight... thanks

 

[mjfoster77]

http://s112.photobucket.com/albums/n161/mjfoster77/?action=view&current=DSC01850.jpg

http://s112.photobucket.com/albums/n161/mjfoster77/?action=view&current=DSC01849.jpg

Let me know if you need better pics. Thanks again for you help