[QUOTE=Bluey;7952938]
We generally set posts about 3’ in the ground, 5’ sticking out.
The trouble with getting the rail too high, some horse may try to walk under it and if too low, one that gets scared may try to jump it.
Have seen both happen and it is not good when they are tied to it.
The last one we set, it was 4 1/2 thick wall pipe, set 3’ down in concrete and a horizontal pipe, same size, saddled on the uprights at 4’ 8" high.
It was about 4’ close to the wall of the barn, so horses were not too apt to try to walk under or over it.
Never had a horse get in trouble there and we tied plenty of colts there to teach them to get baths.
What you may find with wood, you may have the rare horse scratch on it and get a splinter and an abscess from it, especially if the wood is treated wood, very caustic.
That is why we went to pipe for ours.
With wood, you don’t need to use concrete, just pound the dirt back in there properly and it will hold a horse pulling on it.
Concrete is also fine, we have had plenty we did that with and if you do, one trick to keep the wood sound longer is to wrap it in some thin, black “roofing felt” material.
As for the cross brace, that metal strip in the picture seems strong enough to hold it there if a horse were to pull back.
I have seen some just cross tied with a 1" rope to the uprights and that seemed to also keep everything in place.[/QUOTE]
Thanks Bluey! The rail will be along a wall, so not likely to have someone try to go over or under it!