CALNNC, Lowes sells a product called Insulfoam R-Tech. I believe it is the same EPS insulation product as Home Depots PolyPro. It is the type of foam made from thousands of little white foam balls. They add a sheet of foil to one side and a sheet of plastic for a vapor barrier to the other. The foil makes it difficult to cut with a hot knife, but it may help as a ground plane for Lionel command system if a ground wire is attached to it. It cuts with any type of knife, but then sheds the little static charged balls that cling to everything. At one time you could buy 4 x 8 sheets without the facing but I haven't seen it sold like that in a long time, other then the pre-cut pieces that fit between wall studs. Does what I'm describing sound like the same thing. I still have a long way to go on my basement layout and may try substituting with this instead of Homasote sandwiched between plywood.
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