I think the basis for the pro sound dampeners, like B-quiet, is not that they are asphalt. It's because they have other mineral particles mixed in with the asphalt. Apparently, as I have read, the asphalt and the particles are of different densities, so they vibrate at different rates. This internal friction dissipates the energy of the vibration, so the vibration stops. For those who have had success with roofing materials, the different densities of metal and asphalt probably gave you some results. I'll bet that with the pro products you would find a higher degree of damping, maybe less than you might notice. I have often wondered if you mixed asphalt and sand, and applied that, if it would do the same thing as the pro stuff. Either way, adding mass or more rigidity to the metal should help in some way. Personally, I would love to fill up all panels with expanding foam and have a rock-solid quiet ride. Bill Marshall 85 GL Tiico Bradenton FL |
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