- 1). Dig 8-inch-diameter postholes 48 inches deep, using an auger or posthole digger. Set the holes 8 feet 4 inches apart from hole center to hole center. Check frequently to make sure the holes are perfectly vertical, not at an angle.
- 2). Place two 6-inch-diameter, 8-foot-long posts in the holes. Don't fill the holes, since you'll need to be able to adjust the tops of the posts to match the exact length of the horizontal brace.
- 3). Use the chainsaw to carve notches 1 inch deep and 4 inches long into the sides of the posts facing each other. Place the notches about 6 inches from the tops of the posts. The ends of the horizontal brace post will rest in the notches so the brace post does not slip.
- 4). Position a 4-inch-diameter, 8-foot-long wood post or landscape timber so the ends rest in the notches in the corner posts. Have a helper hold the horizontal brace in place while you drive a nail diagonally through each end of the brace and into the corner posts.
- 5). Fill the postholes with concrete mix. In most climates, it is not necessary to add water; there is sufficient moisture in the soil to set the concrete. Use a level to plumb the posts while filling the holes.
- 6). Drive a large staple into the corner post at the end of the fence--on the face opposite the horizontal brace and 4 inches above ground level. Drive another staple into the other post--on the face opposite the horizontal brace and 4 inches from the top of the post.
- 7). Thread No. 9 galvanized wire through the staples, looping the wire around both posts four times to form a diagonal brace. Twist the ends of the wire together securely, using fence pliers.
- 8). Stick a 2-foot length of rebar or other steel rod through the center part of the wire loops, midway between the two posts. Rotate the bar, twisting the wire until it is quite tight. Rest the end of the metal rod against the horizontal brace to keep it from untwisting. Run a loop of wire around the horizontal brace and the end of the metal rod to keep in place.
- 9). Let the corner post assembly set for at least three days so the concrete hardens. Adding the wire and tightening the fence too soon will cause the corner posts to shift and lean.
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