I'm starting my new project, a 6 foot vinyl privacy fence. a lot of online resources recommend putting gravel into the holes (6 inches worth). Is this really necessary? i figured with a wood fence it would be to prevent rotting. But was wondering if placing them directly in the concrete was bad... seeing as how they're vinyl. i'm in norfolk, va. if climate is a factor.
I don't plan on putting 4x4s down the center of the posts, only at the gate.
also, any tips? I was planning on putting the corners in first, then tying a string corner to corner - then staking out where the posts should go. I was going to do dig all the holes, but do 2 posts/panel at a time to reduce the risk of error. (instead of all the posts at once, which i'm sure i'd screw up).
Thanks for the help everyone!