Which timber defect runs along the rings of timber?

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Study for the NHI Bridge Inspection Course 130055. Prepare with flashcards and multiple choice questions, each question includes hints and explanations. Ensure you're ready for your exam!

Multiple Choice

Which timber defect runs along the rings of timber?

Explanation:
Shakes are cracks that form along the grain of the timber, following the direction of the growth rings. They develop when internal stresses or uneven drying pull the wood apart along those ring lines, so the crack runs parallel to the rings rather than straight across them. This makes shakes the defect that runs along the rings. In contrast, a surface check is a small edge crack on the surface, a split is a through-thickness crack across the grain, and warp refers to deformations like bow, crook, twist, or cup, not cracks along the rings.

Shakes are cracks that form along the grain of the timber, following the direction of the growth rings. They develop when internal stresses or uneven drying pull the wood apart along those ring lines, so the crack runs parallel to the rings rather than straight across them. This makes shakes the defect that runs along the rings. In contrast, a surface check is a small edge crack on the surface, a split is a through-thickness crack across the grain, and warp refers to deformations like bow, crook, twist, or cup, not cracks along the rings.

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