722.2.1.2 Multi-wythe walls.
BC § 722.2.1.2
For walls that consist of two wythes of different types of concrete, the fire-resistance ratings shall be permitted to be determined from Figure 722.2.1.2. For SI: 1 inch = 25.4 mm. Figure 722.2.1.2Fire-resistance Ratings of Two-wythe Concrete Walls













