I've started a new stack, for oak that I can leave in the vault for three years. First I weeded out a garden bed, and laid down two layers of water-permeable pool safety cover. I secured the edges with old patio blocks. Then pallets on top of that. On each long side, I set up metal 2x4 brackets with stringers 12 feet long. I was worried about the pallets collapsing under the weight of the stacks, so I laid down some long splits of green oak to absorb some of the load. Then the fun part, stacking! The side facing my neighbor is birch, to look pretty. Then inside all the oak chunks. This is where I knocked off, and tarped up before the rain.