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<blockquote data-quote="Rudy" data-source="post: 5647389" data-attributes="member: 568035">The foil absolutely matters - the thicker the better. Rubbery deadeners depend on stresses between the adhesive and the constraining layer (foil). Extensional dampers - liquids, etc. are much stiffer and use a completely different damping mechanism.Products like the one you are describing (butyl with a plastic or Mylar facing) provide almost no damping at all. You may be able to get good results if you can find a rigid and thin adhesive and glue some heavy foil on top of it but that depends entirely on the composition of the butyl layer. Roofing products are designed to be weather proof. The facing is meant to protect the butyl. If they damp vibrations, it is just a coincidence.Adding mass is not an effective way to deal with vibration in this context. All it does is lower the resonant frequency of the panel. To lower it enough to be inaudible, you will have to add more weight than is practical. You are just as likely to lower the RF into a more troublesome range as you are to improve things.The results that people who use Peel &amp;amp; Seal and similar materials get are a slight stiffening of the panel and isolation of adjacent panels from each other - a result that can best be described as: slightly better than nothing. Then it falls off or melts.</blockquote>

[QUOTE="Rudy, post: 5647389, member: 568035"] The foil absolutely matters - the thicker the better. Rubbery deadeners depend on stresses between the adhesive and the constraining layer (foil). Extensional dampers - liquids, etc. are much stiffer and use a completely different damping mechanism. Products like the one you are describing (butyl with a plastic or Mylar facing) provide almost no damping at all. You may be able to get good results if you can find a rigid and thin adhesive and glue some heavy foil on top of it but that depends entirely on the composition of the butyl layer. Roofing products are designed to be weather proof. The facing is meant to protect the butyl. If they damp vibrations, it is just a coincidence. Adding mass is not an effective way to deal with vibration in this context. All it does is lower the resonant frequency of the panel. To lower it enough to be inaudible, you will have to add more weight than is practical. You are just as likely to lower the RF into a more troublesome range as you are to improve things. The results that people who use Peel & Seal and similar materials get are a slight stiffening of the panel and isolation of adjacent panels from each other - a result that can best be described as: slightly better than nothing. Then it falls off or melts. [/QUOTE]

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