Posted by Mike Carroll, Wireless Communications Consultant on March 31, 2004 at 13:28:43:
In Reply to: sound proofing posted by iyke on February 02, 2004 at 11:05:56:
My response may be too late, judging by the date of your posted message.
Air is not your main enemy, unless the airspace is completely closed and without significant ventillation. If the two structures are not connected, some noise and vibration can be conducted via gravel, soil, a common foundation (e.g. concrete slab), subsurface materials like rock, etc. Also, if the generator you are referring to uses an engine with an external exhaust system, that can cause a lot of noise radiation. If the noise is not being conducted as mentioned above, external and internal treatment of walls with dense but cellular foam sound absorbing and reflecting materials might help. If the interior walls of office bldg. are sheet rock, it can be removed and then cork or high density foam may be put on the wall studs and the sheet rock re-attached. Also, minimizing the contact of your interior walls with the structure can be achieved by adding a second, "fake" interior wall that is only suspended from the top (i.e. hung by steel hardware at as few places as possible for support) and secured to the floor using materials that don't conduct sound well. An air space of 3 to 6 inches should be left between the two walls with nothing connecting one to another. Stability in the cavity can be had using glued-in blocks of high density poly foam. It will also help if the two walls are not completely parallel to one another.
'Hope this helps.
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