Ibhodi le-PVC elicwebezelayo Lefenisha lenziwe ngenqubo ye-Co-extrusion, okuyinguqulo ethuthukisiwe yenqubo evamile yokukhipha.I-co-extruded foam board yenza ishidi lihlanganiswe nezingqimba ezintathu: izingqimba ezimbili zangaphandle ze-PVC eqinile, futhi ungqimba oluphakathi luyi-PVC yegwebu.