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Hello ksax73, I've built three layouts using foam board as a subroadbed, and I can recommend two roadbed materials. Cork roadbed works well if glued to the foam board with yellow carpenter's glue or Liquid Nails for Projects. I then glue my track to the roadbed with a bead of Walther's Goo or a thin layer of Liquid Nails for Projects. Homasote is also quite suitable. You can cut out the roadbed from a 4 x 8-foot sheet (available at most home-improvement stores) or use a commercial product such as Homabed. Glue the Homasote to the foam board with yellow's carpenter glue. The advantage Homasote offers is that it holds spikes very well, so gluing the track isn't necessary. Whether you choose cork or Homasote, have some long T-pins handy, like the kind Woodland Scenics offers, to pin the roadbed to the foam board while the glue dries. Hope this helps, Paul Schmidt Contributing Editor Trains.com
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