Great question huh? In fact, I need to preserve this half way rotten stump for a possible piece of art to be mounted on top of it. (On a golf course) It is 3' in diameter at the base, 4' tall, but has a rotted center that you could fit a bowling ball into. We are planning a very large and expensive wood carving to be mounted on top of this stump. Will filling the rotten middle with cement stop the rotting process for at least a few years? If you can answer that one, your good.