How do you get into that area??? It looks like it is only about 24" between the floor and ceiling. I've been using a number of things. To put my extruded foam down on the bench, I use the Liquid nails for foam. To place anything on top of the foam, like roadbed, I use the el cheapo white latex caulk. I use the clear el cheapo latex caulk to put the track onto the roadbed. It all works out really well.