Abstract: A building structure (100) is erected on a concrete slab (105). The structure comprises a rigid beam-and-post frame (110) and a plurality of wall and roof panels (130, 145). A first end of the posts (120) of the frame are secured to the concrete slab. A beam (115) is secured to a second end of the posts. Adjacent wall and roof panels are secured to one-another by interlocking edges joined with adhesive or other fasteners. Wall panels adjacent to the posts of the frame may be secured to the posts. Roof panels are secured to the beam and wall panels. Wall panels are secured to the concrete slab by adhesive sealant (1000), angles (1005), and bolts (1010, 1015). Ceiling panels are secured to the beam by a plurality of bolts (1010), and brackets (1005, 1200). Openings (135) for windows and doors are formed in the wall panels.