@Richie C. posted:John, FWIW, I used 3/4" blue foam on my layout and secured it to the plywood top using Liquid Nails construction adhesive applied with a caulking gun. After gluing, I immediately placed heavy books and objects on top to make sure it stayed flat and let it dry overnight.
I inserted screws through the track and into the foam, but not long enough to penetrate the plywood decking. I put some CA glue on the tip of each screw to help hold it into the foam. My experience is that you don't really need to overtighten the screws in the foam. They're just there to keep the track from shifting around.
Richie, Thanks a ton for the details and pics! I noticed you did not cookie cutter the track you elevated. What did you use for roadbed on the elevated sections? How did you get the transition from flat to start to elevate? It appears you just used some gradualted blocking supports for the fastrack. Again thanks for the info.
