I live in the Philippines, and I can't find cork roadbed here. Currently, I am considering to use gravel as a roadbed. What do you think about this idea? Or there is another material I could use?
Mike, I don't recommended using just any kinda gravel. Some guy's do even sifting dirt for landscape but again, not recommended. The ballast that you buy has undergone a wash process of chemical to clean it and then baked to dry and kill any last living parisites that might be living in it then bagged and shipped. That's just to make a long story short. The parasites can grow and cause discoloration over time or any number of thing's. I saw one layout that it was done with dirt and after a few year's in a different enviorment started growning a white velvet looking mold that was unsightly. Just my $.02 of knowledge.