Building a Concrete Block Wall (Cinder Blocks)

Building a Concrete Block Wall (Cinder Blocks): Complete Guide

Building a concrete block wall requires proper pattern and reinforcement. The key is the "running bond" pattern (overlap blocks). Fill every 3rd cell with concrete and rebar for strength. Understanding these techniques ensures a strong, stable wall.

The Running Bond Pattern

Running bond is essential:

What It Is

• Overlap pattern: Blocks overlap like bricks
• Staggered joints: Joints don't align vertically
• Standard pattern: Standard block laying pattern

Why It Matters

• Strength: Creates interlocking structure
• Stability: Prevents weak vertical seams
• Prevents failure: Overlap prevents separation

How to Create Running Bond

1. First row: Lay full blocks
2. Second row: Start with half block (or cut block)
3. Continue pattern: Stagger each row
4. Maintain overlap: Each block overlaps blocks below

Filling Cells with Concrete and Rebar

Fill every 3rd cell for strength:

Why Fill Cells?

• Adds strength: Concrete provides structural strength
• Reinforcement: Rebar adds tensile strength
• Creates columns: Filled cells act as columns
• Prevents failure: Critical for structural walls

How to Fill

1. Place rebar: Insert vertical rebar in cells (every 3rd cell)
2. Fill with concrete: Pour concrete into cells
3. Vibrate: Tap or vibrate to consolidate
4. Continue pattern: Fill every 3rd cell vertically

Spacing Pattern

Typical pattern:

• Every 3rd cell: Fill cells at regular intervals
• 4 feet on center: Typically every 4 feet
• Or every 3rd block: Adjust based on wall size

The Bottom Line

Build concrete block walls using the running bond pattern (overlap blocks like bricks) and fill every 3rd cell with concrete and rebar for strength. Running bond creates interlocking strength, and filled cells provide structural reinforcement. Without running bond, walls are weak. Without filled cells, walls lack structural strength.

Need help building a block wall? Contact Local Concrete Contractor. We build block walls correctly with proper running bond and reinforcement.