Originally Posted by horsecrazygirl13
The ground at our place is dark dirt and clay deeper down. Some of the posts can be 'wiggled' a little bit. Would that be a problem? How thick should the posts be?
You don't really want any wiggle in your posts. If they move, they need to go in deeper or you need to cement or tamp dirt around them to make them more secure. As to how thick, I prefer the 4-5" posts because I could safely tie any or my horses to these and they wouldn't likely pull it out or break the post if they pulled back. How heavy your posts need to be depends on what you are using for fencing and how far apart they are. If you are stringing 3-4 strands of rope, you can get away with a thinner post, but will need more of them. If the clay in your ground is shallow, you may have difficulty pounding in thinner posts without breaking them. In this case, you can use heavier posts, metal posts or auger your post holes.
As another alternative, you could put in heavier posts further apart (say 50') and then fill the gaps with lighter or step in posts every 12-15'. This isn't my preference, but doable.
I use step in plastic posts to cross fence inside my paddocks, but would never use these for the perimeter or for permanent fencing. Two strands of rope is a out all they can handle without bending.