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.
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