Acoustic Treatment on soundproofed walls?

454 Views 5 Replies 3 Participants Last post by Terry Montlick, Dec 19, 2005

globulo

Discussion Starter · Dec 17, 2005

I am soundproofing a room with clips, hat channels and a barrier plus R19. Do I need to treat the walls inside the room after the drywall is applied?

I am confused by this "batting" that I read about. Do I need to do this even if I use the above? And if so, where can I read about how to do it?

Thanks for helping a rookie.

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tonybradley

· #2 · Dec 17, 2005

Quote:

Originally Posted by globulo
I am soundproofing a room with clips, hat channels and a barrier plus R19. Do I need to treat the walls inside the room after the drywall is applied?

I am confused by this "batting" that I read about. Do I need to do this even if I use the above? And if so, where can I read about how to do it?

Thanks for helping a rookie.

Yes, you will most definitely want to treat the inside of the room. The method you are using is good for 'soundproofing' only and doesn't have an effect on how the audio sounds 'inside' the room. Many on the forum use 1" Linacoustic from the floor up to ear level all around the room, and floor to ceiling on the front wall, then cover with Fabric such as Guilford of Maine (GOM). I will be using Owens Corning 703 1" Rigid Fiber Glass Boards, covering with GOM and hanging at the First Reflection Points.

Take a look at the Acoustic Master Thread. TONS of great information on treating the inside of your room.

http://www.avsforum.com/avs-vb/showthread.php?t=255432

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globulo

Discussion Starter · #3 · Dec 18, 2005

Quote:

Originally Posted by tonybradley
Yes, you will most definitely want to treat the inside of the room. The method you are using is good for 'soundproofing' only and doesn't have an effect on how the audio sounds 'inside' the room. Many on the forum use 1" Linacoustic from the floor up to ear level all around the room, and floor to ceiling on the front wall, then cover with Fabric such as Guilford of Maine (GOM). I will be using Owens Corning 703 1" Rigid Fiber Glass Boards, covering with GOM and hanging at the First Reflection Points.

Take a look at the Acoustic Master Thread. TONS of great information on treating the inside of your room.

http://www.avsforum.com/avs-vb/showthread.php?t=255432

Thanks so much. Is this Linacoustic OR the Owens Corning dangerous? Both have fiber glass? What are the health risks involved?

Also, what do you mean by "hanging"? You will hang panels at frp? Why would you need to do that if you do soundboard below and batting on top of everything?

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Terry Montlick

· #4 · Dec 18, 2005

Quote:

Originally Posted by globulo
Thanks so much. Is this Linacoustic OR the Owens Corning dangerous? Both have fiber glass? What are the health risks involved?

There have been no studies which have shown fiberglass to be a human health risk. This isn't to say that there will never be any such data. But the fibers are confined by the fabric covering, and do not freely circulate in the air. Fiberglass does irritate the skin during installation, and acoustical cotton is making rapid inroads because it is a friendlier material to work with.

Quote:

Also, what do you mean by "hanging"? You will hang panels at frp? Why would you need to do that if you do soundboard below and batting on top of everything?

The fiberglass should be at the first reflection points. If your polyester batting doesn't reach this high for your speaker setup, substitute a piece of fiberglass. Polyester batting is a sound absorber, but not nearly as effective as semi-rigid fiberglass for the batting density typically used for home theaters.

Regards,

Terry

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globulo

Discussion Starter · #5 · Dec 19, 2005

Quote:

Originally Posted by Terry Montlick
The fiberglass should be at the first reflection points.

I know you'll laugh about this but, where are these exactly? I read that you use mirror along the side walls to see where the front speakers are reflected and that is where the FRP are.

Quote:

Originally Posted by Terry Montlick
If your polyester batting doesn't reach this high for your speaker setup, substitute a piece of fiberglass.

This part is not clear. I place the linacoustic to ear level, cover it with batting. Above ear level, batting alone. GOM over everything else. What do you mean by "the batting not reaching this high for your speaker setup"? You mean to place fiberglass instead of batting at a certain position?

Quote:

Originally Posted by Terry Montlick
Polyester batting is a sound absorber, but not nearly as effective as semi-rigid fiberglass for the batting density typically used for home theaters.

So, you'd recommend using fiberglass INSTEAD of batting, or just a panel of fiberglass at the first reflection point?

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Terry Montlick

· #6 · Dec 19, 2005

Quote:

Originally Posted by globulo
I know you'll laugh about this but, where are these exactly? I read that you use mirror along the side walls to see where the front speakers are reflected and that is where the FRP are.

Yes, the spots where you can see the front speakers reflected off of a mirror placed on the wall are the first reflection points.

Quote:

This part is not clear. I place the linacoustic to ear level, cover it with batting.

I don't know why you would cover the Linacoustic with batting.

Quote:

Above ear level, batting alone. GOM over everything else. What do you mean by "the batting not reaching this high for your speaker setup"?

Must have misspoke. I meant the fiberglass reaching this high.

Quote:

You mean to place fiberglass instead of batting at a certain position?

Exactly.

Quote:

So, you'd recommend using fiberglass INSTEAD of batting, or just a panel of fiberglass at the first reflection point?

Just panels of fiberglass at the first reflection points (if there isn't already fiberglass there, of course).

- Terry

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