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I haven't had a model railroad layout for over 30 years. I now have a two year old grandson and am back at for him.....and for me. I have the standard 4 X 8 structure built and have been reading MR to discover that I need to put down 1" of foam plus another 2" of foam. Other than sound deadening I am not sure why. I understand that the foam (pink insulation board) can be used for scenery but don't understand the 1" - 2" thing. I also can't figure out what to do if I want to have an over/under layout and have all this foam insulation to deal with. What's the story? Jim Rochester Hills, Michigan
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