I recently had a company over that installed a deer fence that has 4x4 pressure treated fenceposts set in concrete. They didn't crown the concrete; and with some of the posts the natural level of the ground will eventually cause the posts to come into contact with dirt. I live in California, so it's dry anyways much of the year, but a friend was surprised that the concrete wasn't crowned anyways, to help keep water off the wood and thus to make is less liable to rot. I know this type of PT wood as a 20+ year warranty for direct soil contact, but I'm wondering about anyone's real world experience. I could always put a crown on the concrete, if I'm careful to use the right mix so that it doesn't crack etc. But I'm not going to bother unless I'm convinced that it could make a difference in the lifespan of the fence.
Thanks