METACAULK® Composite Sheet Metacaulk® Composite Sheet is a rigid, fi re resistive panel used to seal penetrations and restore the fire-rating to floors, ceilings or walls in which a large opening has been made for the passage of penetrating items. It is made of a reinforced, highly intumescent material which is bonded on one side to a galvanized steel sheet. Light weight & Easy to install Thinner sheet cuts & bends with standard sheet metal hand tools Systems rated to 4 hours Saves time & money Sheets come 36” x 36” x 0.2”