Well I found out my home city allows hens on residental property...soo....I have a 5'x15' run and want to line the open bottom with bricks. How deep should I place the bricks? I am lining the lower 4' of the run with hardware cloth , should I place a liner of hardware cloth over the bricks then add some soil and top off with sand? I am sure I am on overkill, but I am so happy that my dream of chickens have come true!