When piping conduit or similar obstructions are encountered the insulation shall be packed tightly around the obstruction.
Fire blocking insulation.
Owens corning 15 in.
Insulation materials fire block insulation and foam fiberglass insulation secured tightly batts or blankets insulation cellulose insulation at approved thickness spray foams that are approved for fire blocking.
Fire block and firestop are two different concepts and use different materials.
Great stuff fireblock insulating foam sealant is a ready to use minimal expansion insulating foam sealant that fills and insulates gaps up to 3 4 inch to restrict airflow.
Unfaced fiberglass batt insulation used as fireblocking shall fill the entire cross section of the wall cavity to a minimum height of 16 inches 406 mm measured vertically.
F ire blocking aims to prevent or at least slow the vertical movement of flames smoke and gases by sealing off concealed spaces like stud cavities and soffits.