Perimeter Fire Containment Training: Code Requirements
International Building Code 2018
Section 705.8.5 Vertical Separation of Openings
Openings in exterior walls in adjacent stories shall be separated vertically to protect against fire spread on the exterior of the buildings where the openings are within 5 feet (1524 mm) of each other horizontally and the opening in the lower story is not a protected opening with a fire protection rating of not less than ¾ hour. Such openings shall be separated vertically not less than 3 feet (914 mm) by spandrel girders, exterior walls or other similar assemblies that have a fire-resistance rating of not less than 1 hour rated for exposure to fire from both sides, or by flame barriers that extend horizontal