SC Wood Frame Structures Practice Questions - South Carolina Wood Frame Structures Contractor Examination Exam

A nail is overdriven so the shingle surface is cut and the head sits below the mat. Why is that a defect?

Overdriven nails are preferred because they hide the fastener IBC requires all heads to be countersunk 1/4 inch Overdriven nails increase required penetration below the sheathing The head no longer clamps the shingle; water can enter the cut, and the shingle can tear off in wind

Correct Answer:

The head no longer clamps the shingle; water can enter the cut, and the shingle can tear off in wind

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