- There is an iron nail in the middle of a concrete slab. As it rusts, will this rust stain travel with gravity, or could it possibly travel up toward the sky?
Main Question or Discussion Point
I work in the swimming pool industry. We often lock lumber into concrete by hammering hot galvanized nails half way into the lumber for the concrete to grab a hold of. In an "argument" with my boss, I told him if we set the nails at least an inch below the top of the concrete, the rust will not travel up to the visible deck. He argues that it can. I assume this "liquid rust" (if you will) would follow the path of least resistance, like most liquids do. I just can't imagine the path of least resistance would be up when there are just as many gaps beneath the nail as above. Just looking for somebody to back me or correct me.