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R607.2.1 Bed and Head Joints
Unless otherwise required or indicated on the project drawings, head and bed joints shall be 3/8 inch (10 mm) thick, except that the thickness of the bed joint of the starting course placed over foundations shall not be less than 1/4 inch (7 mm) and not more than 3/4 inch (19 mm).
R607.2.1.1 Mortar Joint Thickness Tolerance
Mortar joint thickness for load-bearing masonry shall be within the following tolerances from the specified dimensions:
  1. Bed joint: + 1/8 inch (3 mm).
  2. Head joint: - 1/4 inch (7 mm), + 3/8 inch (10 mm).
  3. Collar joints: - 1/4 inch (7 mm), + 3/8 inch (10 mm).
R607.2.2 Masonry Unit Placement
The mortar shall be sufficiently plastic and units shall be placed with sufficient pressure to extrude mortar from the joint and produce a tight joint. Deep furrowing of bed joints that produces voids shall not be permitted. Any units disturbed to the extent that initial bond is broken after initial placement shall be removed and relaid in fresh mortar. Surfaces to be in contact with mortar shall be clean and free of deleterious materials.
R607.2.2.1 Solid Masonry
Solid masonry units shall be laid with full head and bed joints and all interior vertical joints that are designed to receive mortar shall be filled.
R607.2.2.2 Hollow Masonry
For hollow masonry units, head and bed joints shall be filled solidly with mortar for a distance in from the face of the unit not less than the thickness of the face shell.

Related Code Sections

R607.2 Wall Construction, Placing Mortar and Masonry Units
mortar shall be sufficiently plastic and units shall be placed with sufficient pressure to extrude mortar from the joint and produce a tight joint ...
R606.3.7 Wall Construction, Masonry Bonding Pattern
than one-fourth the unit length, or the masonry walls shall be reinforced longitudinally as required in Section R606.3.7.2 ...
R608.2 Wall Construction, Masonry Bonding Pattern
than one-fourth the unit length, or the masonry walls shall be reinforced longitudinally as required in Section R608.2.2 ...