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The principle reason I advocate the use of foam instead of plywood for sub roadbed is the ease of creating below grade level scenery(roads,rivers,ditches,ect..). I'm in N scale and have had layouts with plywood sub roadbed before I started using extruded styrofoam. I couldn't tell any difference in the amount of sound deadening between the two materials. <br /> The greatest disadvantage to using foam any thicker than an inch is the difficulty created using under layout switch machines.
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