This document is a technical drawing by Hilti Firestop Systems (UL/CUL System No. C-AJ-0070) detailing specifications for a blank opening in a concrete floor/wall or block wall assembly with a 2-hour fire rating. The drawing provides precise instructions for creating fire-resistant openings, specifically:
The assembly must use lightweight or normal weight concrete floor/wall or a UL/CUL classified concrete block wall (minimum 4-1/2" thick). 2. The opening requires a minimum 4" thickness of mineral wool (with 4 PCF density) tightly packed. 3. A minimum 1/2" depth of Hilti FS-ONE MAX intumescent firestop sealant must be applied. The maximum diameter of the opening is limited to 7", and the firestop sealant is required on both sides of the wall assembly. This technical specification is part of a VA renovation project for Building 15's 2nd floor at the Asheville, NC location, with solicitation number 36C24625B0007.
