Chain Link Fencing: Sagging Prevention And Repair

Loose chain link fencing doesn't just look bad, but it also makes it easier for pets and children to squeeze underneath. Sometimes a fence may even seem to be tight and secure, but over time slack develops. The following can help you determine the cause of the looseness, as well as provide information on how to take up the slack.

Why good fences sag

Over time, sagging and looseness can occur due to a variety of reasons.

Sagging from the top

Likely causes:

  • Loose tension wire through the top of the fence.

  • Warped or deformed fencing from climbing over.

  • Improper attachment to the posts.

Loose or bowed out bottom

Likely causes:

  • Deformed fencing from pets or people climbing beneath the fencing.

  • No bottom support line for the fencing.

  • Loose fence posts.

Loose center or all-over looseness

Likely causes:

  • Leaning items against the fence, which deforms the chain link.

  • Loose posts.

  • Too much fencing.

Once you are sure of the cause, you can fix the problem and prevent it from happening again.


The first part of any repair starts with the anchoring posts. These must be checked and reinstalled, perhaps with concrete, if they are loose. Once they are firmly installed and the chain link is fully attached to them, you can move on to other repairs.

If the top tension line is the culprit, it can be removed and a new one restrung. As for a bottom sag, it is also possible to install a tension line or bar at the bottom to prevent sag and to make it more difficult to crawl beneath. This is especially helpful if you have pets you want to keep in your yard.

When the actual fencing has become bent or deformed, you may need to replace the fencing. In some cases you can simply tighten the fencing to account for the distortion, while in other cases the damage can be so severe that the section will need replaced.

To tighten deformed fencing or just loose overall fencing, a tension bar is used. The bar is inserted through the fence near the first post by the sagging area and twisted until the fence is tight. It is then resecured to the fence post and you move on and repeat the process on the next fencing section. Once the entire fence has been properly tightened, the excess fence is attached to the end posts or removed.

For more help, contact a fence installer or chain link fence repair contractor in your area.