Originally Posted by Trinity
Well I guess I was a little blunt on how I said mounted 4x4's. I mounted them directly to the concrete with brackets, this is probally temp. so I did'nt want to cut, dig, $ pour the existing concrete. Just Anchor Holes only.
You already know this is not the way to do it. You cannot hang a dynamic load like that.
You dig the hole down at least 36" or below the frostline. You dig the hole at least 3x wider then the post. You fill the bottom of the hole with gravel so it drains away from the post bottom. Depending on the weight of the gate, you can concrete the post in or you can fill the space around the post with an angular gravel, tamping every 6" or so. This keeps the water away from the post and will keep the post anchored. If you're uncertain about the weight, dig the hole 4x the post and fill with gravel. I've hung 3'x5' cedar gates from this without an issue.