Lighter CMUs are less expensive, require less labor to install, and tend to have better fire resistance properties. There are three classifications of CMU: lightweight (less than 105 lb/ft 3), medium weight (between 105 lb/ft 3 and 125 lb/ft, and normal weight (more than 125 lb/ft 3. The weight of concrete masonry units varies depending on the density of concrete mix used. 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. CMU SIZEĬoncrete Masonry Unit (CMU) SpecificationsĬMU manufacturers must conform to ASTM standards when fabricating concrete blocks. While 4", 6", 8", 10", and 12" are the standard sizes, some manufacturers offer other sizes not listed below. The following table provides concrete block sizes in both nominal and actual dimensions. The architect should always attempt to design buildings using the nominal dimensions to the nearest half-block size to reduce waste and labor due to cut blocks. For instance, a 6" CMU is nominally 6" deep while a 10" CMU is nominally 10" deep.Ĭoncrete 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. They are identified by their depth – i.e. If you have any questions or problems registering online, please contact us via the website or see a staff member in-branch for help.Concrete Block - Nominal vs Actual Dimensions Concrete Block (CMU) SizesĬoncrete Masonry Units (CMUs) are manufactured in a variety of sizes.
We also offer self-build accounts, so if you are not a tradesperson but are planning a self-build project, we can still supply you with the bulk concrete blocks you need.
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Just upgrade your web login using your Jewson Account number to unlock access to your usual trade prices. Trade customers can benefit from personalised prices when you bulk buy concrete blocks on the Jewson website. If you are building masonry that needs to attach to a cavity wall carcass or you want to tie two skins of masonry together, our wall & frame ties are the solution.įor an estimate of how many concrete blocks you will need for your project, use our Brick & Block Calculator, which can work with standard block sizes or custom breeze block dimensions. Whatever you are building, make sure you have sand and cement so that you can mix the correct concrete or mortar for the job. Together, these make it possible to construct a wide range of different walls and structures, from load-bearing, to decorative, to retaining walls built using lightweight blocks. We also have hollow blocks such as breeze blocks and cinder blocks, which are a versatile choice for many different applications. These include lightweight blocks suitable for external walls, as well as dense blocks more appropriate for load-bearing needs and structural walls. Jewson concrete blocks cater to a variety of different applications, so that you can get the building supplies you need for your upcoming project.
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