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2304.11.2 Partitions and Walls
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Exterior walls shall be permitted to be cross-laminated timber not
less than 4 inches in thickness meeting the requirements of Section 2303.1.4.
Interior walls and partitions shall be of solid wood construction formed by not less than two layers of 1-inch (25 mm) matched boards or laminated construction 4 inches (102 mm) thick, or of 1-hour fire-resistance-rated construction.
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