Abstract: An easily transported and erected building structure formed of polystyrene foam blocks. The blocks are reinforced and held together by tension rods extending through the blocks and attached to connector boards between the blocks. Complex, habitable, highly energy-efficient structures are easily assembled and reassembled in various configurations by two workers without special skills or lifting equipment.

Abstract: An easily transported and erected building structure formed in part as a vault made of interlocking voussoirs in the form of identical insulated boxes. Permanent exterior joint connectors prestress the voussoirs for strength. Easily installed interior clips join the voussiers. A floor made of insulated boxes is supported on a quickly-assembled adjustable structural frame. End walls made of insulating boxes close the ends of the vault or vaults. External cladding and interior finishing panels, corresponding generally to the dimensions of the voussoirs, are easily installed and removed. Interior raceways are formed along the joinder lines of the insulated boxes. All of the parts of the structure are designed for erection of the structure in harsh environments, without handling small loose parts.