"Anything can be turned into construction material," Bo told Matt. "We build it up, section by section with whatever we've got, whatever we can find. Then we take it out in pieces and put it together around the perimeter." Bo was confident in his ability to make a mountain - or a wall in this case - out of a mole hill. While the items weren't ideal, there was a lot they could use. Any doors in the school building that weren't being used had been pulled off the hinges and brought to the gym. Those pieces would be the best force they had.
Bo pointed at them.
"The doors are going to be great for the main structure. The rest of the pieces are just going to link them together and any big pieces of wood or metal we can find. Anything to keep the walkers out."