Re: fiberglass or noise?

[Guest guest]

Carla,

Two issues, fiberglass dust can be very irritating to lungs, eyes, and

skin. In some respects, because of its larger fiber size, these

physical effects are much more pronounced than asbestos fibers at

similar high concentration.

Of course, no one is every exposure to similar high levels of asbestos

fiber any more.

The techniques for controlling asbestos fibers would be the same for

fiberglass.

However, your client may need to rethink the use of Icynene for sound

proofing. Is this a high frequency or low frequency problem? Use of

foam to reduce sound levels would only work if there was significant

holes in the existing wall and many inches of foam are used. Further,

this foam would do nothing to attenuate low frequency.

If the neighbor is using a boom box or other base generating equipment,

only " mass " will attenuate the sound. Double 8 " concrete block works

pretty well, or 3 brick thick walls or 6-8 " of concrete.

Bob

[Guest guest]

Thanks, I will let him know. He was going to use it for low frequency noise and had consulted a sound engineer about.

Carla

Re: fiberglass or noise?

Carla,Two issues, fiberglass dust can be very irritating to lungs, eyes, and skin. In some respects, because of its larger fiber size, these physical effects are much more pronounced than asbestos fibers at similar high concentration.Of course, no one is every exposure to similar high levels of asbestos fiber any more.The techniques for controlling asbestos fibers would be the same for fiberglass.However, your client may need to rethink the use of Icynene for sound proofing. Is this a high frequency or low frequency problem? Use of foam to reduce sound levels would only work if there was significant holes in the existing wall and many inches of foam are used. Further, this foam would do nothing to attenuate low frequency.If the neighbor is using a boom box or other base generating equipment, only "mass" will attenuate the sound. Double 8" concrete block works pretty well, or 3 brick thick walls or 6-8" of concrete.Bob

[Guest guest]

1. Fiberglass is a very sound absorber. Frequency variation aside.

a) I have specified FG in noise reduction.

I prefer it to foam - fills gaps better than rigid foam; will not degrade

compared to vibration effects on sprayed in foam.

c) I prefer it to blown-in cellulose (this settles inside walls over time,

leaving gaps at the top)

2. Few materials are good at low frequencies.

3. Speech is generally in the 1000-4000 Hz range with some toward the 6000 Hz.

These are the critical ranges.

4. If the noise is from inside the building, changing the wall interior material

will do little, better off damping the windows or changing the acoustics of the

surface to minimize reverb.

5. If the noise is from outside it depends on the source - low or high (high is

easier to deal with).

6. If you are trying to minimize room-to-room (inside a building) then the best

ways are:

A) Offest the drywall mounting to the wall (eg. Use different studs on opposing

sides of a wall to minimize transfer)

Put insulation in the walls

C) Eliminate even small openings to the room of question.

7. On the Tox side:

TLV is 2 fibers per cubic centimeter (2 f/cc; certain size restrictions)

However, I know of irritation at very low levels (<0.01 f/cc) under the right

circumstances.

It dissolves (or is transported out) fairly readily in the lungs (1/2 life of

2-90 days depending on the study)

In terms of size, it generally does not have the aerodynamics to penetrate the

lungs very well

8. Determine the source of the noise first.

Tony

...........................................................................

" Tony " Havics, CHMM, CIH, PE

pH2, LLC

PO Box 34140

Indianapolis, IN 46234

cell

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consultant can give you the other 10%â„ 

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Re: fiberglass or noise?

Carla,

Two issues, fiberglass dust can be very irritating to lungs, eyes, and

skin. In some respects, because of its larger fiber size, these

physical effects are much more pronounced than asbestos fibers at

similar high concentration.

Of course, no one is every exposure to similar high levels of asbestos

fiber any more.

The techniques for controlling asbestos fibers would be the same for

fiberglass.

However, your client may need to rethink the use of Icynene for sound

proofing. Is this a high frequency or low frequency problem? Use of

foam to reduce sound levels would only work if there was significant

holes in the existing wall and many inches of foam are used. Further,

this foam would do nothing to attenuate low frequency.

If the neighbor is using a boom box or other base generating equipment,

only " mass " will attenuate the sound. Double 8 " concrete block works

pretty well, or 3 brick thick walls or 6-8 " of concrete.

Bob

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We believe this constitutes a 'fair use' of any such copyrighted material as

provided for in section 107 of the US Copyright Law. In accordance with Title 17

U.S.C. Section 107, the material on this site is distributed without profit to

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for research and educational purposes. For more information go to:

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must obtain permission from the copyright owner.

[Guest guest]



Much appreciatied.

carla

RE: fiberglass or noise?

1. Fiberglass is a very sound absorber. Frequency variation aside. a) I have specified FG in noise reduction. I prefer it to foam - fills gaps better than rigid foam; will not degrade compared to vibration effects on sprayed in foam. c) I prefer it to blown-in cellulose (this settles inside walls over time, leaving gaps at the top)2. Few materials are good at low frequencies.3. Speech is generally in the 1000-4000 Hz range with some toward the 6000 Hz. These are the critical ranges.4. If the noise is from inside the building, changing the wall interior material will do little, better off damping the windows or changing the acoustics of the surface to minimize reverb.5. If the noise is from outside it depends on the source - low or high (high is easier to deal with).6. If you are trying to minimize room-to-room (inside a building) then the best ways are:A) Offest the drywall mounting to the wall (eg. Use different studs on opposing sides of a wall to minimize transfer) Put insulation in the wallsC) Eliminate even small openings to the room of question.7. On the Tox side: TLV is 2 fibers per cubic centimeter (2 f/cc; certain size restrictions) However, I know of irritation at very low levels (<0.01 f/cc) under the right circumstances. It dissolves (or is transported out) fairly readily in the lungs (1/2 life of 2-90 days depending on the study) In terms of size, it generally does not have the aerodynamics to penetrate the lungs very well8. Determine the source of the noise first.Tony.......................................................................... "Tony" Havics, CHMM, CIH, PEpH2, LLCPO Box 34140Indianapolis, IN 46234 cell90% of Risk Management is knowing where to place the decimal point...any consultant can give you the other 10%â„ This message is from pH2. This message and any attachments may contain legally privileged or confidential information, and are intended only for the individual or entity identified above as the addressee. If you are not the addressee, or if this message has been addressed to you in error, you are not authorized to read, copy, or distribute this message and any attachments, and we ask that you please delete this message and attachments (including all copies) and notify the sender by return e-mail or by phone at . Delivery of this message and any attachments to any person other than the intended recipient(s) is not intended in any way to waive confidentiality or a privilege. All personal messages express views only of the sender, which are not to be attributed to pH2 and may not be copied or distributed without this statement.-----Original Message-----From: iequality [mailto:iequality ] On Behalf Of Bob sSent: Thursday, January 05, 2006 10:55 AMTo: iequality Subject: Re: fiberglass or noise?Carla,Two issues, fiberglass dust can be very irritating to lungs, eyes, and skin. In some respects, because of its larger fiber size, these physical effects are much more pronounced than asbestos fibers at similar high concentration.Of course, no one is every exposure to similar high levels of asbestos fiber any more.The techniques for controlling asbestos fibers would be the same for fiberglass.However, your client may need to rethink the use of Icynene for sound proofing. Is this a high frequency or low frequency problem? Use of foam to reduce sound levels would only work if there was significant holes in the existing wall and many inches of foam are used. Further, this foam would do nothing to attenuate low frequency.If the neighbor is using a boom box or other base generating equipment, only "mass" will attenuate the sound. Double 8" concrete block works pretty well, or 3 brick thick walls or 6-8" of concrete.BobFAIR USE NOTICE:This site contains copyrighted material the use of which has not always been specifically authorized by the copyright owner. We are making such material available in our efforts to advance understanding of environmental, political, human rights, economic, democracy, scientific, and social justice issues, etc. We believe this constitutes a 'fair use' of any such copyrighted material as provided for in section 107 of the US Copyright Law. In accordance with Title 17 U.S.C. Section 107, the material on this site is distributed without profit to those who have expressed a prior interest in receiving the included information for research and educational purposes. For more information go to: http://www.law.cornell.edu/uscode/17/107.shtml. If you wish to use copyrighted material from this site for purposes of your own that go beyond 'fair use', you must obtain permission from the copyright owner.