AZ ROC R-22 House Moving Practice Questions - Arizona ROC R-22 House Moving Examination Exam

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A structural mover constructs a standard 2x2 box crib tower using sound 6x6 inch (nominal) hardwood timbers (actual dimensions 5.5 in x 5.5 in). If the allowable compression stress perpendicular to the grain for the wood species is 500 psi, what is the safe working load capacity of the cribbing tower based on the 4 bearing contact points?

60,500 lbs (approx. 30.25 tons) 121,000 lbs (approx. 60.5 tons) 30,250 lbs (approx. 15.1 tons) 90,750 lbs (approx. 45.4 tons)

Correct Answer:

60,500 lbs (approx. 30.25 tons)

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