Before getting carried away with the excitement of removing the forms, we'd better add one more row of bags as a locking row to maintain downward pressure on the keystones. This will ensure the integrity of the arch after removal of the form (Fig. 6.66).


Lay the barbed wire over the top of the whole last row, including the keystones. Lay a final row of bags. Laying a tube (or continuous bag) is an excellent way to lock in the keystones, while integrating the arch with the rest of the wall. Bags or tubes will perform the same function. The wall will continue to become more stable as the fill material cures inside the bags (Fig. 6.67).

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