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A206.6 Minimum Member Size
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Wood members used to develop anchorage forces to the diaphragm must be at least 3-inch (76 mm) nominal members for new construction and replacement. All such members must be checked for gravity and earthquake loading as part of the wall-anchorage system.
Exception: Existing 2-inch (51 mm) nominal members may be doubled and internailed to meet the strength requirement.
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