Secure-Lock Structural Insulated Panels (SIP’s) are high-performance building panels for floors, walls and roofs in residential and commercial buildings. Structural Insulated Panels use expanded polystyrene (EPS) foam insulation sandwiched between two structural skins of steel (used in the patented Secure-Lock panel). The result is a building envelope system that is hurricane, seismic, fire, pest and mold-resistant, as well as energy efficient, fast to erect, and cost effective.