Porter Structural insulated panels (SIPs) are a high performance building system for residential and commercial construction. They consist of an insulating layer of rigid EPS (Expanded Polystyrene) sandwiched between two layers of OSB (Oriented Strand Board). SIPs are a unique building product that combines structure and insulation in one large rigid panel – up to 8′ x 24′, use up to 50% the energy of conventional buildings and can be erected in half the time For more info please visit https://www.portercorp.com.