Application of mortar should be made to either end of the brick to form a 3/8-inch-full head joint.
IRC: Chapters 4 (https://codes.iccsafe.org/content/IRC2018/chapter-4-foundations) and 6, section 606 (https://codes.iccsafe.org/content/IRC2018/chapter-6-wall-construction), outline types of joints and the joint-required thickness based on materials and structural code requirements.
Process/Skill Questions:
NCCER Standards:
Core Curriculum: Introductory Craft Skills
Masonry: Level One (L1NCCT28)