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Two 2-inch (51 mm) nominal width framing members shall be permitted in lieu of any required 3-inch (76 mm) nominal width framing member when the existing and new framing members are of equal dimensions, when they are connected as required to transfer the in-plane shear between them, and when the sheathing fasteners are equally divided between them.

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602.4.3 Types of Construction, Roof Framing
be not less than 3 inches (76 mm) nominal in thickness. Where protected by approved automatic sprinklers under the roof deck, framing members shall ...
602.4.5 Types of Construction, Roof Framing
be not less than 3 inches (76 mm) nominal in thickness. Where protected by approved automatic sprinklers under the roof deck, framing members shall ...
2308.5.5.1 Wood, Openings in Exterior Bearing Walls
with Table 2304.10.1 or of solid lumber of equivalent size. Single-member headers of nominal 2-inch (51 mm) thickness shall be framed with a single flat 2 ...
2308.5.3 Wood, Plates and Sills
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