[TheForge] Acoustical baffling

[Grover Richardson]

There are 2 ways.  Either redirect the noise (point it at the sky), or
baffle, as noted below.  Some cheap hanging material could be good, or old
egg crates.  Or build a couple of walls, insulate between the walls and
leave the sheetrock off.


-----Original Message-----
From: theforge-bounces at mailman.qth.net
[mailto:theforge-bounces at mailman.qth.net] On Behalf Of Peter Fels And Phoebe
Palmer
Sent: Monday, July 26, 2004 11:32 PM
To: terry l. ridder; Sponsored by ABANA
Subject: Re: [TheForge] Acoustical baffling


Don,  perhaps the generalized way to think about stopping sound is to 
put a lot of mass with an irregular surface between the neighbor and the 
machine. A big compost pile would do for example.
 My old friend Art Beal  RIP would have suggested a big steaming pile of 
cow ship and then told you that they'd never notice the compressor 
then....PF

terry l. ridder wrote:

>hello;
>
>comments intermixed below.
>
>On Sun, 25 Jul 2004 PlumDon at aol.com wrote:
>
>don>  
>don> My 7.5 hp T-30 compressor is located outside my shop and under a 
>don> roof but
>don> not enclosed. But it is close (100') to a neighbor. It comes on
frequently when  
>don> I am using the Old Blue hammer or sand blasting cabinet. I'm afraid it
is  
>don> beginning to irritate them and I would like to head off any problems. 
>don>  
>
>an inexpensive way to shield noise is to berm a structure which 
>contains the air compressor. this could be as simple as a section of 
>corrugated galvanized steel pipe set on a bed of crushed rock at grade 
>and mound with sand than top soil. the open ends can be easily capped 
>with sheet metal or wooded doors.
>
>another method would be to plant fast growing bushes or trees between 
>the air compressor structure and your neighbor. the foliage would act 
>as a sound break and look nice at the same time. would beat the look of 
>those concrete sound barriers that seem to be sprouting up everywhere 
>along the expressways ( oxymoron ) in northern illinois.
>
>another example, which a company here used to isolate their backup 
>generator is given below in ascii art::
>
>                  /\
>                /    \
>              /        \
>            /            \
>          /                \ <- simple gable roof
>          [][            ][] <- 3ft high wall 
>          [][            ][]
>          [][            ][]
>          [][            ][]<- railroad ties
>     /----[][            ][]----\  <-- the actual slope is 
>    /     [][            ][]     \     not this steep it is a more
>   /      [][            ][]      \    gentle slope.
>  /       [][            ][]       \
> / earth  [][            ][] earth  \
>/         [][            ][]         \
>----------------------------------------- <-- grade
>
>the railroad ties were drilled so that rebar could be driven through 
>them and into the ground. also deadman anchors were used for every 
>third railroad tie. the deadman anchors were nothing more than 1 inch 
>threaded rod with a three foot section of 10 inch diameter concrete. 
>the 1 inch threaded rod goes through the railroad tie to 1/4 inch steel 
>plate 6 inches heigh by 12 inches wide and tighten down with a lock 
>washer and nut.
>
>another company did something similar but used 12 ft i-beams spaced 
>vertically so that the railroad ties could be slid in between them.
>
>        ---          ---         ---
>         |[          ]|[         ]|  <- top view
>        ---          ---         ---
>
>        | |[        ]| |[       ]| |
>        | |[        ]| |[       ]| |
>        | |[        ]| |[       ]| |
>        | |[        ]| |[       ]| | <- side view
>        | |[        ]| |[       ]| |
>        | |[        ]| |[       ]| |
>        | |[        ]| |[       ]| |
>------------------------------------ <- grade
>        | |          | |         | | <- 4ft of i-beam below grade
>
>my 2 cents.
>
>don>  
>don> I put up a 4' x 8' wall with T-111 and home insulation. Helps but 
>don> still a
>don> lot of noise going to the neighbors. I was thinking some kind of
convenient  
>don> roll-up sound insulating blanket might be available that I could just
drop down,  
>don> like a shade or curtain when in use. Any one have any experience or 
>don> suggestions?  They would be greatly appreciated. 
>don>  
>don>  
>don> Don  Plummer
>don> 
>
>  
>


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