My layout is being built with a combination of 1/2 inch OSB, 3/4 INCH high density foam and a second layer of 1/4 INCH FOAM. Frame work is 1x4's on a 24 inch spacing. I use 2 inch drywall screws to hold gargraves turnouts in place, going into the OSB. I paint the foam flat black before installing the track, therefore cutting down on the amount of ballast I would need. The flex track is glued to the foam using black latex caulk that has silicone in it. The 1/4 INCH FOAM is used to make the ties disappear into the scenery as if the rail has worked itself into the ground. Since mine is a switching layout, the track looks like it is poorly ballasted. The high density foam holds up to the weight of the trains very well.
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