The Cinder Block vs Concrete Block Guide: When To Use Each
- srcustommasonry
- Jul 21
- 4 min read
If you’ve ever tackled a building project or wandered through a hardware store, you’ve probably seen all kinds of landscaping and building blocks lying around. Cinder block vs concrete block might not seem like a big decision at first, but the choice actually matters quite a bit. Continue reading to learn when it’s better to use one kind of block over the other so you’ll be prepared when it comes time for your next big project.
What is a Cinder Block?
A cinder block is a heavy, rectangular building block made from concrete and coal cinders. It’s basically a hollow brick. Most are about the size of a small backpack. They usually have two open cells in the center. You’ve probably seen them stacked in walls or lying around construction sites. They're solid, tough, and kind of ugly, but super useful in the right situation.
Cinder Block Dimensions
Cinder blocks come in a few standard sizes, but the most common one is around 16 inches long, 8 inches tall, and 8 inches deep. That’s the outside measurement. The inside is hollow, which helps keep the weight down. There are also half-blocks and thinner versions for smaller spaces. Some are made longer or shorter depending on the job. Even though they’re not all the same, most are close to this general size.
Common Uses For Cinder Blocks
These blocks are super versatile and show up in all kinds of places. People use them for more than just big buildings. You’ll see them in DIY projects, landscaping, and even furniture.
Here are some of the most common uses for cinder blocks:
● Building walls and foundations
● Creating raised garden beds
● Making outdoor benches or shelves
● Constructing fire pits
● Supporting workbenches or tables
● Forming retaining walls
● Weighing down outdoor equipment
● Building outdoor stairs or steps
● Creating makeshift parking barriers
● Forming compost bins or planters
What is a Concrete Block?
A concrete block is similar to a cinder block but made entirely from solid concrete. It’s heavier, denser, and usually much stronger. These blocks feel more solid when you pick them up. There are no coal cinders mixed in, just cement, gravel, and sand. They’re built to handle more weight and pressure. They’re kind of like the more serious, bulked-up cousin of the cinder block.
Concrete Block Dimensions
Most concrete blocks are about 16 inches long, 8 inches high, and 8 inches deep. They’re pretty similar to cinder blocks in size. Some versions are solid all the way through, while others have hollow cores. You can also find larger or specialty sizes depending on the project. They’re made to fit together easily, especially in large-scale construction. Even though the materials are different, the shape is pretty similar.
Common Uses For Concrete Blocks
These blocks are generally used in heavy-duty construction where strength really matters. They’re preferred for projects that need serious support and durability. Unlike cinder blocks, these can handle a lot more stress and weight, so they show up in bigger jobs.
Some common uses include:
● Building load-bearing walls
● Constructing basements or foundation walls
● Creating commercial and industrial buildings
● Forming retaining walls for heavy soil
● Reinforcing sound or fire-resistant walls
● Supporting highway or bridge structures
● Building secure storage or utility spaces
● Installing underground shelters or storm bunkers
● Creating structural cores for tall buildings
● Reinforcing embankments or flood barriers
Key Differences Between Cinder Block vs. Concrete Block
If you stacked a cinder block next to a concrete block, you might not see much of a difference. But once you lift them or take a closer look, the differences are fairly obvious. One is easier to move around, while the other feels solid and built for hefty work. That’s because cinder blocks are made with lighter materials like coal ash, while concrete blocks use gravel and sand for extra strength.
Cost can also play a role. Cinder blocks are usually a bit cheaper, which makes them appealing for smaller projects. But concrete blocks offer more strength, which can be worth the extra money in the right situation. It all depends on what the job calls for.
When Not To Use Cinder Blocks
Cinder blocks shouldn’t be used for projects that need a lot of strength or long-term support. They’re not the best for foundations, basements, or structural walls. In wet or humid environments, they may not hold up well over time. For anything that needs to stay solid and secure, it’s better to choose something stronger.
When Not To Use Concrete Blocks
Concrete blocks aren’t always the right choice, especially for small or decorative projects. They’re heavy and harder to work with, which can make simple jobs more difficult. If you’re doing light landscaping, furniture builds, or anything that doesn’t need a lot of strength, they might be overkill. For quick or creative projects, something easier to handle is usually a better fit.
The Cinder Block vs Concrete Block Guide Conclusion
Choosing between cinder blocks vs. concrete blocks mostly comes down to what your project really needs. Some jobs call for staying power, while others are all about ease and flexibility. Knowing the difference helps you plan smarter and avoid surprises later.
If you’ve got a project coming up and you're in the Salt Lake area, S&R Masonry is here to help. We know our way around building blocks, whether it’s something simple or a full-scale structural job. Our crew is also experts at brickwork, stone veneers, outdoor kitchens, and more. Whatever you're building, we’ll help you do it right.
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