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BC § 2109.4.3
The minimum thickness for partitions shall be as follows: Table 2109.4.3Minimum Thickness of Masonry Partitions Height of WallsThickness8 ft. and under2 in. Over 8 ft. to 12 ft.3 in. Over 12 ft. to 16 ft.4 in. Over 16 ft. to 20 ft.6 in. Over 20 ft. to 24 ft.8 in. For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
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