The stability of the fence is dependent on post placement. On wood fencing our post spacing is 8 feet. On aluminum fencing it’s 6 feet. Each post is set in dry pack sakrete in order to stabilize the fence. The depth of the holes for each post is determined by the height of the fence. For instance, on a 6 foot fence the depth of the holes is 27-36″. On a 4 foot fence, the depth of the holes is 20-24″. Here at LDFCo, we follow these standards.