What are the weights of a normal-strength CMU block and a lightweight CMU block?

• A. 32 lbs normal, 28 lbs lightweight
• B. 40 lbs normal, 35 lbs lightweight
• C. 48 lbs normal, 36 lbs lightweight
• D. 60 lbs normal, 48 lbs lightweight

Answer: (B)

CMU block weight is driven by the material density and design: normal-weight blocks use standard dense concrete, while lightweight blocks use lighter aggregates or hollow cores to reduce weight. In typical practice, a normal-weight CMU block weighs about 40 pounds per unit, and a lightweight CMU block weighs about 35 pounds per unit. The chosen values reflect common published references used for planning, handling, and estimation, making this pairing the best match for standard expectations. Remember that exact weights can vary slightly by manufacturer and block geometry, but 40 pounds for normal-weight and 35 pounds for lightweight are the standard quick-reference figures.