Which practice helps prevent lumber from falling when stacked?

• A. Wrap with plastic
• B. Stack loosely
• C. Cross stack, block, or tier the stack
• D. Store nearby heat source

Answer: (C)

Stability in a lumber stack comes from interlocking and supporting the layers so the stack resists movement. Cross-stacking, blocking, or tiering the stack creates a staggered, interlocked structure that prevents boards from shifting or tipping the whole pile. Cross-stacking places boards in directions that lock into one another, edge to edge, so the stack resists sliding. Blocking adds solid supports at intervals to stop lateral movement and keep ends aligned. Tiering divides the pile into shorter, anchored sections, making it harder for any single layer to cause a collapse. Together, these practices keep the stack stable during handling and storage, reducing the risk of lumber falling.

Wrapping with plastic doesn’t address stability and mainly affects moisture. Stacking loosely invites movement and collapse. Storing near a heat source can cause warping and damage without improving stack safety.