A CMU is nominally 8"x8"x16", is this statement true?

The statement that a CMU (Concrete Masonry Unit) is nominally 8"x8"x16" is indeed true. In the context of construction and masonry, the nominal dimensions of a CMU refer to the dimensions as they are marketed for use, which is typically rounded to the nearest whole number for simplicity and ease of communication in plans and specifications.

The nominal size of 8"x8"x16" describes a block that is designed to measure 8 inches in height, 8 inches in width, and 16 inches in length. It's important to note that actual dimensions of CMUs may be slightly less than the nominal sizes due to the manufacturing processes, which account for the mortar joint in installations. However, in terms of nominal dimensions, the statement is correct and provides standard reference for builders and architects when planning and designing masonry structures.

Understanding that nominal sizes are standard helps in ensuring that all parties involved in construction are on the same page regarding the dimensions of materials being used. Such consistency is critical in architectural drawings and construction documents.