No joints in any _______ adjacent courses in a wood shingle roof should be in direct alignment.

No joints in any _______ adjacent courses in a wood shingle roof should be in direct alignment.

• A. two
• B. three
• C. four
• D. five

Answer: (B)

Joints in wood shingles must be staggered so a seam never runs straight through multiple courses. This prevents a continuous vertical line of weakness where water can infiltrate and the shingles may not be fully supported. The rule specifies that in any three consecutive courses, the joints should not be directly aligned. By offsetting the joints across successive courses, you break up the seam line, improving weather resistance and ensuring better coverage and nail support for the courses above and below. If joints were allowed to align across three adjacent courses, a clear path for water could form, increasing the chance of leaks. The emphasis here is on preventing that three-course alignment to maintain a durable, weather-tight roof.

Joints in wood shingles must be staggered so a seam never runs straight through multiple courses. This prevents a continuous vertical line of weakness where water can infiltrate and the shingles may not be fully supported.

The rule specifies that in any three consecutive courses, the joints should not be directly aligned. By offsetting the joints across successive courses, you break up the seam line, improving weather resistance and ensuring better coverage and nail support for the courses above and below. If joints were allowed to align across three adjacent courses, a clear path for water could form, increasing the chance of leaks. The emphasis here is on preventing that three-course alignment to maintain a durable, weather-tight roof.