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Sound Absorbent Material for Enclosure


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  #11  
Old 10-21-2018, 07:39:19 PM
turtmaster turtmaster is offline
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Default Re: Sound absorbent material for enclosure

What about rockwool insulation Batts?
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  #12  
Old 10-21-2018, 07:47:12 PM
Zephyr7 Zephyr7 is offline
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Default Re: Sound absorbent material for enclosure

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Originally Posted by Ed Radtke View Post
foil backed duct board.its 1/2 or 3/4" styrofoam with foil on the front and I think its flame retardent.get it at your local hvac supply house maybe even the big box stores.
Nope, it’s flammable and requires a thermal barrier (1/2” drywall usually) per code. It also can’t handle high temperatures so isn’t suitable for generator enclosures.

Bill

The commercial sound attenuated enclosures usually use rigid mineral wool panels. It’s important to not enclose the panels on the inside since you want the sound to “see” the soft mineral panel and not steel. This is probably the cheapest way to go, and the stuff is easy to order through places like Home Depot. Note that rigid mineral wool panels are quite different from the mineral wool batts that are more commonly stocked in the box stores and both are very different from fiberglass. Mineral wool has the advantage of being pretty much fireproof.

You can also get MLV (mass loaded vinyl) sheets that have a foil face and are rated for high heat. The last time I used this stuff I got it from aircraft spruce (online dealer). The aircraft guys use it to soundproof parts of their aircraft.

You can also use lead sheet but I’d stay away from that since it’s difficult to work with.

DO NOT use packing foam panels or the stuff they use for stuffing seat cushions. That stuff is crazy flammable and dangerous for this application. There have been night club fires that have killed people because of people using cheap materials for DIY sound proofing that caught fire. Be careful.

Bill

Last edited by Zephyr7; 10-21-2018 at 09:47:39 PM.
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  #13  
Old 10-21-2018, 08:12:21 PM
Newoldstock Newoldstock is offline
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Default Re: Sound absorbent material for enclosure

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As already said , the only thing that really works is mass.
My wife has quite a bit of mass and there is no end to irritating noises she makes....
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  #14  
Old 10-21-2018, 09:22:27 PM
Jim Tremble Jim Tremble is offline
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Default Re: Sound absorbent material for enclosure

Try 2'x4' ceiling tile. The kind that goes into the grid type ceiling.

Fire proof and deadens sound. I have used it on several projects. AND, cheap.

Jim
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Old 10-21-2018, 09:27:59 PM
Thaumaturge Thaumaturge is offline
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Default Re: Sound absorbent material for enclosure

Best thing I know of is high density fiberglass sheet. Looks very much like acoustic ceiling panels, except about an inch thick. Got exposed to it in my first stint in commercial broadcasting at a top 40 AM-FM station when the chief engineer specified its us to line several recording studios. Amazing stuff. You vould put your head in a corner facing corner and barely hear someone talking righr behind you.
Was also very pricey stuff. As I recall it was about $75 per 48"x96" (4'x8') sheet. This was in 1979. Faced with white highly pourous material. Fiberglass back was dense enough to be simply glued to wall with building adhesive.
Doc

Think this is the stuff, or very similar:http://www.buyinsulationproductstore...avy-density-6/

Wow, Amazon MUCH cheaper. 48 sq/ft of 2" for ~$67 +45 sh, so total ~$112 https://www.amazon.com/Owens-Corning.../dp/B005V3L834
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Last edited by Thaumaturge; 10-22-2018 at 02:46:43 AM. Reason: Add s/h fees
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Old 10-21-2018, 09:43:16 PM
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Jim McIntyre Jim McIntyre is offline
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Default Re: Sound absorbent material for enclosure

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My neighbors have been supportive since they noticed I did all that, then the power company never came....

How far away are they? Any chance of buying power off them?
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Old 10-21-2018, 09:51:52 PM
trukinbear trukinbear is offline
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Default Re: Sound Absorbent Material for Enclosure

Too far, I wish!
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Old 10-22-2018, 07:08:21 AM
willie1959 willie1959 is offline
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Default Re: Sound Absorbent Material for Enclosure

http://www.kayelaby.npl.co.uk/genera...2_4/2_4_4.html


Excellent guide for sound reduction I used drywall with the split cavity .

have to laugh but snow is the cheapest and the best .


https://inspectapedia.com/BestPracti...ansmission.php

found it shows pictures
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Old 10-27-2018, 09:09:15 PM
DMeed DMeed is offline
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Default Re: Sound absorbent material for enclosure

Quote:
Originally Posted by Thaumaturge View Post
Think this is the stuff, or very similar:http://www.buyinsulationproductstore...avy-density-6/

Wow, Amazon MUCH cheaper. 48 sq/ft of 2" for ~$67 +45 sh, so total ~$112 https://www.amazon.com/Owens-Corning.../dp/B005V3L834
I think you want to look at http://www.buyinsulationproductstore...tic-board-2-3/ at $59 for comparison to the amazon stuff. The first link is 706 board (6 lbs density) vs 703 board that is 3 lbs density.
Basically twice as much material compressed into the same space so the price doubling is no surprising.

One of the most important things is to realize that leaving any openings will defeat much of the purpose of this stuff, unless they lead into ducts, ideally serpentine, that are also coated with sound absorption on all surfaces that the sound can bounce off. Air for cooling will have to be handled carefully and appropriately.

There is a rigid duct board for lining a/c ducts that would be worth investigating - check for fire retardant properties before buying a lot. Hit anything you want to use with a blowtorch for several minutes and see how it reacts.
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Old 10-27-2018, 10:35:38 PM
EnginePat EnginePat is offline
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Default Re: Sound Absorbent Material for Enclosure

When I ran the djc I used 2 layers of 4" rigid insulation and a heavy foil over it. And 4' galvaneal sheetmetal around the bottom of the wall. And a ground muffler made out of 4" dia clay pipe buried 12" deep 12' long.
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