... a core of rigid foam insulation Definition of SIP: Structural insulated panels (SIPs) are high-performance building materials used in exterior wall ... of rigid foam insulation (EPS, PU, XPS and so on) between two skins of structural/engineered panels like oriented strand board OSB ... : 1220x2440mm,1220x2743mm,1220x3050mm,1220x6100mm,Thickness: 114mm,165mm, 210mm, 257mm. Structural Insulated Panels