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At Marvel Builders Inc., we take pride in constructing durable and dependable foundations for our residential projects. One of the key components in many of our builds is the 8″ Concrete Masonry Unit (CMU) block, particularly for garage foundations. Today, we’ll walk you through the process and highlight the importance of incorporating anchor bolts for framing.

Why Choose 8″ CMU Blocks?

Concrete Masonry Unit blocks, commonly known as CMU blocks, are a popular choice for foundations due to their strength, durability, and cost-effectiveness. The 8″ size is ideal for residential garage foundations, providing robust support to bear the load of the structure above and resist various environmental pressures.

Steps to Laying 8″ CMU Blocks

  1. Preparation and Layout
  • Start by clearing and leveling the ground where the foundation will be laid.
  • Mark the perimeter of the garage with stakes and string lines to ensure a precise layout.
  • Excavate the area to the required depth for the footing.
  1. Building the Footing
  • Pour a concrete footing that will serve as the base for the CMU blocks. Ensure it is wide and deep enough to support the weight of the garage.
  • Allow the concrete to cure for at least 24 hours before proceeding.
  1. Laying the First Course
  • Begin at one corner, placing the first CMU block on the cured footing.
  • Use a mason’s line to ensure the blocks are level and aligned.
  • Apply mortar to the ends and bottom of each block to create strong joints.
  1. Subsequent Courses
  • Stagger the blocks in a running bond pattern for added strength.
  • Continue laying blocks, checking for level and alignment regularly.
  • Strike the mortar joints to compact and smooth them for a finished appearance.
  1. Installing Anchor Bolts
  • Anchor bolts are essential for securing the wooden framing to the concrete foundation. For a garage, bolts should be spaced every 6 feet along the top course of CMU blocks.
  • As you lay the top course, insert the anchor bolts into the wet mortar at the designated intervals.
  • Ensure each bolt is positioned vertically and protrudes the correct height above the block to accommodate the framing plate.
  1. Curing and Inspection
  • Allow the CMU wall to cure for several days. This ensures the mortar reaches its maximum strength.
  • Inspect the wall to verify that all blocks are properly aligned and that the anchor bolts are securely embedded.

The Importance of Anchor Bolts

Anchor bolts play a crucial role in the stability of your garage. By securing the wooden framing to the concrete foundation, they prevent lateral movement and uplift, which can be caused by wind loads and other forces. Proper spacing, typically every 6 feet, ensures that the load is evenly distributed, enhancing the overall integrity of the structure.


Laying an 8″ CMU block foundation is a fundamental step in building a sturdy and reliable garage. At Marvel Builders Inc., we emphasize precision and quality in every phase of construction, from the initial layout to the final inspection. By incorporating anchor bolts into the top course, we ensure that your garage will stand the test of time, providing a safe and stable environment for your vehicles and storage needs.

Stay tuned for more tips and insights on residential construction in our weekly blog posts. If you have any questions or need assistance with your next project, feel free to contact us at Marvel Builders Inc. We’re here to help you build your dreams!

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