Addicting
Well-known member
Use 3 ties vertical, outside and 1 center. Attach 1 row on the front to absorb impacts and then the plywood on the back. 8” is more than enough and screwed to the center post cuts out your concern.The challenge would be force at the bottom of an 8' column of sand. Maybe first 2-3ft ties, and plywood above that. I don't want sand breaking out the bottom and leaving voids.
Good unused ties by me are 20ish a tie. That adds up quickly. That’s why I did the cut trees and plywood. I lined the back with slab wood vertically and put all the brush behind that. Some make it thru where the logs meet but have lost so much energy I’m not worried about them. There isn’t anything behind them for 1/2 mile.