Abstract: A building structure that is a one-piece extruded building that can simultaneously build inner and outer walls, roof, reinforcement and optionally even floors. Said structure is made up as a composite of an inner and outer encapsulating building material that provides structural strength, plus an inner core material composed of a highly expanding closed cell foam material for insulation. The building material is polymer based, but can also be a polymer-concrete, wherein traditional fibers are minimized and substituted for other aggregates. The polymer in the encapsulating material can have the catalyst encapsulated and premixed into a slurry form activated at the injection point by mechanically rupturing the capsule, or can be mixed and added at the injection point with a specially designed metering injectors. All comers and joints allow the encapsulating building material to join between inner/outer walls forming columns and evenly spaced beams or studs made from the same encapsulating building material.