Patent ID: 8650830

Claim:
A method of constructing an inhabitable underground structure comprising the steps: creating a cutout in the earth at a desired location to generally match a desired shape of an interior of the underground structure, the cutout having substantially vertical walls; applying a reinforcement structure to an outer vertical perimeter of the cutout and extending across a bottom of the cutout; applying shotcrete over the reinforcement structure to create a monolithic underground structure, wherein one or more transitions from one or more walls of the underground structure to a bottom of the underground structure comprise concave curvatures; forming an inner surface of the bottom of the underground structure to have a concave curvature from the transitions to a central area of the bottom of the underground structure; and placing a floor structure over the bottom of the underground structure such that a resulting finished floor of the underground structure is spaced apart from the inner surface to allow for draining of moisture between the finished floor and the inner surface.