If your site has no soil you can buy it from the same companies who sell
gravel, sand, and bricks, or from a landscape supplier.
Topsoil is sold by the cubic yard (3 ft. X 3 ft. X 3 ft.) (DRAWING?)
- screened: all the rocks taken out
- unscreened: with rocks, but less expensive.
How much will you need?
First, determine the square footage of the area you need to add soil to by
multiplying the length times the width. For example: a 10' by 8' garden
bed contains 80 square feet.
Here are two formulas to calculate the amount of topsoil you will need to
EXAMPLE: We want 12 inch deep soil in our 8' by 10' garden bed.
- For a layer 9 inches deep: LENGTH X WIDTH divided by 36.
- For a layer 12 inches deep: LENGTH X WIDTH divided by 27
8' X 10' =80"
80' divided by 27 = 2.96
So why don't we order three cubic yards of topsoil?
Another way to figure:
For 9 inches, each cubic yard will cover 36 square feet.
For 12 inches, each cubic yard will cover 27 square feet.
Remember: You don't need topsoil for pathways, other paved areas, or in
utility areas, so subtract those areas from your calculations.