North Carolina Building Contractor License Practice Exam

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Which lumber defect is characterized by a lengthwise grain separation between or through the growth rings?

Knots
Shake
Splits
Checks

The correct answer is: Shake

The lumber defect characterized by a lengthwise grain separation between or through the growth rings is known as "shake." This defect occurs when the wood fibers separate along the growth rings, often due to stress or changes in moisture content. Shakes can weaken the structural integrity of the lumber and may affect its appearance and usability, especially in construction where strength is critical. Understanding this defect is important for contractors and builders, as it can impact the choice of materials and the overall quality of a construction project. By recognizing shakes in lumber, professionals can make informed decisions that ensure the safety and durability of their structures.