How many cinder blocks for a 10×10 shed?
Quick Answer
For a simple pier/skid foundation, a 10×10 shed uses 9 solid concrete blocks (typically 4×8×16") placed in a 3×3 grid pattern. For a full perimeter block wall foundation (2 courses high), you'll need approximately 44 standard 8×8×16 CMU blocks.
Quick Reference Table
| Foundation type | Block count for 10×10 shed |
|---|---|
| Pier/skid (3×3 grid) | 9 solid concrete blocks |
| Perimeter wall, 1 course | 22 CMU blocks (8×8×16") |
| Perimeter wall, 2 courses | 44 CMU blocks |
| Full perimeter, 3 courses | 66 CMU blocks |
How to Calculate It Yourself
- 1
For pier foundation: place blocks in a 3×3 grid (corners, midpoints, center).
- 2
For perimeter wall: perimeter = 4 × 10 = 40 linear feet.
- 3
One 16" block = 1.33 linear feet → 40 ÷ 1.33 = 30 blocks per course.
- 4
Subtract corners already counted once, net ~22 blocks per course.
- 5
Multiply by number of courses: 2 courses = 44 blocks.
Pro Tip
For most residential sheds, a 9-block pier/skid foundation is adequate and much cheaper than a perimeter wall. Ensure blocks are level — use a string line and adjust gravel or sand base under each block.
Assumptions to Check
Before ordering materials, confirm the dimensions, product coverage, waste factor, and local installation requirements for your project. Manufacturer coverage tables and local code rules can change the final quantity, especially for structural work, exterior projects, and irregular layouts.
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