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R606.3.1 Bed and Head Joints
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Unless otherwise required or indicated on the project drawings, head and bed joints shall be 3/8 inch (9.5 mm) thick, except that the thickness of the bed joint of the starting course placed over foundations shall be not less than 1/4 inch (6.4 mm) and not more than 3/4 inch (19.1 mm). Mortar joint thickness for load-bearing masonry shall be within the following tolerances from the specified dimensions:
- Bed joint: + 1/8 inch (3.2 mm).
- Head joint: - 1/4 inch (6.4 mm), + 3/8 inch (9.5 mm).
- Collar joints: - 1/4 inch (6.4 mm), + 3/8 inch (9.5 mm).
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