To install a doorway, place a strong box or block form at the desired height and location. Level, square, and plumb the form. Construct door and window forms a couple of inches wider than the tamped width of the bag wall. This keeps the bags from wrapping around the edges of the forms, which would prevent the forms from being removed later. One way to create a form that is easy to work with (and remove later) is to use a split box form or side wedge-box form (Fig. 6.44). (See Chapter 2 for details on a variety of window and door forms).
Rather than build multiple box forms to accommodate the height of a door, consider using straw bales to elevate a single set of split box forms after the walls have been thoroughly compacted (Fig. 6.45).
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