This guide will provide some basic construction information to help you build a good fence. Good fences start with good materials.

Corner and brace assemblies

Once the fence line has been cleared of brush and other obstructions, the first step is locating and installing corners and brace assemblies. This is the most important part of the fence construction process. A fence is no better than its corners and braces. Installation of these assemblies frequently takes up to half the total fence construction time.

Figure 1 shows proper construction of double-span wood-anchor post assemblies. The double span assembly is more than twice as strong as the single span and should be used whenever fence length exceeds 200 feet. A corner post will need a brace assembly for each fence line leading to it. Post depths shown in Figure 1 are minimums. Use deeper settings for clay or wet soil conditions.

The proper method of securing brace wire is shown in Figure 2.

Figure 2
Correct procedure for threading the nine gage smooth wire used as a diagonal in the brace assembly.

When a fence is more than 650 feet between corner posts, put braced-line post assemblies every 650 feet in the fence line. A braced line assembly is the same as a single-span braced corner except that a second diagonal brace wire is used to take fence pull in the opposite direction.

Steel corner post and brace assemblies are available and can be used in place of wooden assemblies. Both posts and braces should be anchored in concrete. The concrete anchor for corner posts should be 20 inches square and extend 3-1/2 feet below ground. Braces may be anchored in 20-inch square blocks extending 2 feet below the ground.

Line posts

Stretch a cord or wire between the completed corner and brace assemblies to help guide the alignment of line posts.

Locate line posts 15 to 20 feet apart. Use the 15-foot spacing for steel posts or wooden posts with less than 3-1/2-inch diameter tops.

Posts may be driven or set with either power or hand tools. If you have more than a few hundred feet of fence to build, use a power driver or auger. Line posts should be set or driven to a minimum depth of 2-1/2 feet.

Steel line posts must be oriented for proper wire placement when installed. Wires normally are placed on the inside, or pasture side, of the post. In some cases, however, wires may be placed on the outside of the post to improve the appearance of the fence. One example of this is where fence lines run along a highway.

Installing fence on posts

The last step in fence construction is installation of the wire. Use the following general procedure:

1.       Install and stretch the wire in sections running from one corner or brace post assembly to the next.

2.       Always work from the top down when installing wire; install the top wire first, then the next highest, etc.

3.       Attach wire to the side of the post closest to the livestock being fenced except where appearance is important.

4.       Use galvanized staples or the wire clips that come with steel posts to attach wire to posts. Minimum staple size should be 1-1/2 inches. Staples should not be driven in so far that they will prevent the wire from moving without moving the post.

Special instructions for installing woven wire are:

1.       Attach the end of the wire to the anchor post by removing a few vertical wires and wrapping the wires around the post and splicing them back onto themselves.

2.       Unroll wire along the ground adjacent to the row of posts and stand the roll on end at the next anchor post.

3.       Prop the wire up against the line posts.

4.       Attach the stretcher unit to the fencing. Use a single jack for fencing under 35 inches and a double jack for higher fencing.

5.       Stretch the fence slowly, making sure tension is being applied evenly to all points. Continue stretching until tension curves in the wire are straightened about one-third ( Figure 3 ).

6.       Fasten wire to line posts starting at the end farthest from the stretcher.

7.       Fasten the end of the wire to the anchor post assembly.

Figure 3
Typical tension curve in woven wire. This curve should be straightened by 1/3 when fence is properly stretched 

Follow the same general procedure for barbed wire with these precautions:

1.       Unroll wire straight off the roll, not off the side.

2.       Stretch wire until it is fairly tight, being careful not to break it. There are no tension curves in barbed wire to aid in stretching.

3.       Wear protective clothing and use extreme caution when working with barbed wire.