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I don't know if I can provide any scientific reason for building with or without plywood but here is my experience. I built a shelf section 2' by 10'. I did not use ply wood. Operating trains on that section always seemed to produce much more sound than my later additions were I used plywood first and then placed the foam on top. The second reason that I placed plywood down first was for easier instalation of switch machines. I now use the plywood first and then the foam. I only use 1/4" plywood ( 6mm ) but it is doing what I want it to do I hope this can help a little.
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