Tip 6: Don't overspan your sections. After you have the post set, depending on the type of fencing, you're going to bring the sections in and attach them between the posts. Since the sections usually come in six- to eight-foot lengths, you don't want to set the posts any more than eight feet apart. If you set them too far apart, the section is without any type of support, so there's a good chance it will be susceptible to wind damage.
