Which statement correctly describes joint alignment across three adjacent courses?

Which statement correctly describes joint alignment across three adjacent courses?

• A. Joints may align on two consecutive courses
• B. No joints in any three adjacent courses should be in direct alignment
• C. Joints must align across all three courses
• D. Joints align on every third course

Answer: (B)

Joints should be staggered so there isn’t a straight vertical seam running through three consecutive courses. If joints in three adjacent courses line up, you create a continuous seam from eave to ridge, which can become a predictable path for water ingress and may weaken wind resistance. The best practice is to ensure that across any three successive courses, joints are not directly aligned. You can have joints align on two consecutive courses, but not across three. This staggered pattern breaks up potential leak paths and improves overall roof durability.

Joints should be staggered so there isn’t a straight vertical seam running through three consecutive courses. If joints in three adjacent courses line up, you create a continuous seam from eave to ridge, which can become a predictable path for water ingress and may weaken wind resistance. The best practice is to ensure that across any three successive courses, joints are not directly aligned. You can have joints align on two consecutive courses, but not across three. This staggered pattern breaks up potential leak paths and improves overall roof durability.