Just had my fence built. Heartwood redwood fence with the brown treated post and a six inch 2x6 kicker of treated wood. And there are some corrosive material in the treated wood. So the framing was done with coated screws. Make sure they mix your concrete and not just dump and add water at hole. And last, make sure the concrete is mounded around post, not to hold water. Hope this helps, DK , CA