Concrete Block

Concrete block—also known as CMU or cinder block—offers a strong, cost-effective way to build walls, foundations, retaining structures, fire pits, and planters. Its modular design speeds layout, its durability stands up to weather and pests, and its fire resistance and sound-dampening properties make it a smart choice for both residential and commercial projects. With the right block type and accessories, you can create load-bearing walls, decorative facades, and landscape features that last.

Popular options include:
- Standard hollow CMU for structural walls that accept rebar and grout
- Solid block for anchors, caps, and applications needing higher mass
- Split-face block for a textured, architectural finish
- Lintel and bond beam units for spanning openings and tying courses
- Corner, half, and jamb blocks for clean transitions
- Slump block and architectural units for distinctive appearances

Common sizes include nominal 8 x 8 x 16, with 4, 6, 10, and 12-inch widths to match design loads. Blocks are available in normal, medium, and lightweight densities to balance strength, thermal performance, and handling. Look for products meeting ASTM C90, with compressive strength and absorption ratings appropriate to your code and exposure. Benefits include high thermal mass, fire ratings, and excellent STC sound control when grouted.

Installation tips:
- Start with a level, reinforced footing and accurate string lines
- Dry-lay the first course to confirm bond pattern and openings
- Use Type S or N mortar with 3/8-inch joints; tool for weather resistance
- Place vertical rebar per plan and fully grout cells where required
- Add control joints per code to manage shrinkage and temperature movement
- Cut blocks with a masonry saw; wear eye, ear, and dust protection

Helpful tools: masonry trowels, jointers, levels, line blocks, rubber mallets, mortar mixers, rebar cutters, and wet saws.

Search, compare, and buy concrete blocks, CMU, split-face block, retaining wall block, and foundation block by size, strength, finish, and price to match your project.