wkearney99 wrote:
... Generac whole-house generator...
We have a 15kW Generac, too, now almost 10 years old. We saved the neighborhood's frozen foods for three days and nights of no power after Charlie by firing up two garage refrigerators, leaving the garage door open for them. Still, we shut the genset down at 11:00PM or so each night; when there are no other sounds except your genset, like it or not you become a nuisance. We've needed it a number of other times, too, usually for a few hours at a time after a storm. It is nice to have where we are, at the end of the line.
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What did your cork and foam cost? How'd you decide what material to use?
I got the foam sheet from Mermaid, local for me, for $14, and the cork came from
http://www.corkstore.com ~$20 shipped. I have half of the "QuietCORK" 6mm sheet left. I've used cork in the past for several projects (great under turntables and heavy speakers), so it's a favorite material. I chose Weldwood Contact Cement and painted an entire 16oz can on the eight surfaces.
The isolator is an approximation of an electronic high-pass filter, but the actual composition is the result of what was inexpensive, available and seemed rational. I asked both Mermaid and the cork supplier if they had technical specs regarding the materials, but learned little. Lacking other things to do, it would someday be interesting to determine if these can truly be tuned to minimize the conduction of compressor vibration. I was tempted, for example, to use two thinner foam sheets and a sheet of lead in the center, more like an electronic "T". This works very well, though, so the motivation to pursue it further is reduced.
Tom
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