English Ivy produces very good hold-fasts that will help it cling. Unless the wood is pressure treated preserved wood humidity will build up and rot it in very short time.
I would never choose ivy, as it seldom stops and has designs on the entire planet.
Despite the extra trouble, I would build a fence or screen that allows air to flow behind it and plant some other of the many beautiful vines that will grow in your zone. I can think of several that are evergreen or not, some liking shade and some liking sun.