1406.5 Retrofit of existing buildings.
BC § 1406.5
Combustible materials shall not be permitted for use at the outermost surface of the exterior wall covering for exterior envelope retrofits of existing nonsprinklered buildings over 75 feet (22 860 mm), unless the following conditions are satisfied: 1. The outermost surface of the combustible exterior wall covering shall be interrupted by a noncombustible material at least 3 feet (914.4 mm) high between the top of one opening and the bottom of the opening immediately above to form a continuous band across building elevations.
2.On walls without openings, a 3 feet (914.4 mm) high noncombustible band shall interrupt the outermost surface of the combustible exterior wall covering at least every 15 feet (4572 mm) vertically.
