Fence Post Footing Detail

Recommended wood fence post foundation details h height of fence above grade feet s spacing of fence posts center to center feet b diameter of round concrete pier hole or dimension of square pier inches d required depth of concrete pier feet and inches p post size wood nominal inches foundation post type and size b 12.

Fence post footing detail.

But surprisingly even digging holes and filling them with concrete is fraught with difficulties. This will seal the gap between the concrete and post that s caused by freeze thaw cycles. You might consider the job done but to further safeguard the fence post against rot. Caulk around the fence post base apply high quality exterior acrylic latex caulk or silicone specifically designed to adhere to concrete at the base of the post.

The depth of your fence post footings will vary according to fence height wind loading and soil type as well as other factors. 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 by250mm wide. The footing should contain reinforcement steel and starter bars. Recommended steel fence post foundation details h height of fence above grade feet s spacing of fence posts center to center feet b diameter of round concrete pier hole or dimension of square pier inches d required depth of concrete pier feet and inches p post size galvanized steel schedule 40 outside diameter od inches center to galvanized steel post.

The standard rule of thumb is to bury at least a third of the length of the fence post in the ground half is better but local building codes may require a minimum depth such as 30 inches so. Do apply caulk to each fence post after only an hour cts rapid set concrete mix will have hardened completely. The bottom of the l is to sit under the load to pull the wall against the lateral forces.