US Patent 10132077 Fast construction of energy-efficient buildings

Described embodiments include a method, including arranging one or more frames (22) and one or more boards (24), such that the frames, together with the boards, enclose a space (26). The method further includes pouring first concrete (28) into the space, and, after the first concrete solidifies, within the space, into a structure (42), removing the boards from the structure. The method further includes pouring second concrete (70) over the frames, such that the second concrete solidifies, over the frames, into respective walls that are adjacent to the structure. Other embodiments are also described.