The Insulspan Structural Insulated Panel (SIPs) System provides green building solutions for commercial and residential construction that reduce energy usage, take less time to install, and provide an airtight thermal envelope for a healthy, sustainable structure. Ready to install as wall, roof, or floor components, the solid, one-piece, pre-cut structural insulated panels are created using two layers of performance rated oriented strand board (OSB) structurally laminated to a core of closed-cell rigid expanded polystyrene (EPS) insulation.