To prevent a post from decaying too quickly as well as to make it easy to remove when it does start.
Metal fence post footing.
Footings for steel posts are often found supporting parking lot lights traffic signal poles and buildings.
When using small steel posts the post can be embedded inside the footing.
Metal fence posts provide strength to the weakest part of your fence.
Depending on your needs you could investigate the use of fiberglass fence post rods and steel t posts if your application permits.
For example an 1800mm fence in wind zone a will require footings of a minimum of 600mm deep by 200mm wide whereas the footing dimensions for the same fence in wind zone d will need to be at least 700 1100mm deep.
Homeowners may use steel posts when building fences.
A wood fence with metal posts that last.
Often times extending the life of your wood fence by 2x 3x or 4x years.
Larger footings have l shaped bolts embedded in them and the steel posts are bolted to the footing.
The depth of your fence post footings will vary according to fence height wind loading and soil type as well as other factors.
Possibly even more so.
Fence posts anchored in concrete footings last for years as long as they re installed properly.
By using metal fence posts with your wooden fence you will extend the life of your fence by multiple years.