Carlisle's SureMB 90 Base Ply is a premium SBS-modified asphalt base sheet which can be used wherever the specification calls for a membrane base ply in conjunction with a cap sheet of FleeceBACK® EPDM AFX, TPO AFX or KEE HP FRS. It can also be used as an air barrier, vapor barrier, and temporary roof (for up to 60 days). Contact Design and Review if SureMB 90 Base Ply is to be used as a temporary roof for more than 60 days.