Lighter CMUs are less expensive, require less labor to install, and tend to have better fire resistance properties. The weight of CMU blocks varies depending on the density of the concrete mix used.ġ) Lightweight CMU Blocks = Weight less than 105 lb/ft 3,Ģ) Medium weight CMU Blocks = Weight between 105 lb/ft 3 and 125 lb/ft, andģ) Normal weight CMU Blocks = Weight more than 125 lb/ft 3. ASTM C90 covers most conventional CMU construction and is the standard referenced by the ICC codes. The following table provides the ASTM standards that apply to concrete masonry units. The standards identify appropriate materials, compressive strength, dimensional tolerance, moisture absorption, and other performance characteristics.Ĭoncrete brick is made from concrete similar to concrete block, but concrete bricks are fabricated in sizes that match traditional clay bricks (i.e. Read More: 10 Types Of Retaining Wall With Full DetailsĬMU manufacturers must conform to ASTM standards when fabricating concrete blocks. In which CMU blocks having sizes 4″, 6″, 8″, 10″, and 12″ are the standard sizes, some manufacturers offer other sizes not listed below The nominal and actual sizes of CMU blocks are given in the below table. The architect always tries to design buildings using the nominal dimensions to the nearest half-block size to reduce waste and labor due to cut blocks. These blocks also come in half-sizes, which are helpful in reducing the need to cut blocks in the field at corners or the end of walls. the thickness of the wall they create. For Example, a 6″ CMU is nominally 6″ deep while a 10″ CMU is nominally 10″ deep. As a building material, CMU blocks offer several attractive characteristics to designers and builders, including the following:ĬMU blocks are manufactured in a variety of sizes. They are distinguished by their depth – i.e. 10×10 Room Construction Cost Excel SheetĬMU blocks are made from Portland cement, aggregates, and water.Construction Material Testing Menu Toggle.30×40 House Plans | 1200 sq ft House Plan.20*50 House Plan | 1000 sq ft House Plan.
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