Calculating Topsoil and Organic Matter for Lawn Installation

Introduction

Achieving a 4–6 inch depth of amended soil over 100 square feet requires a specific volume of topsoil and organic matter.

Material Estimates

• 1–2 inch depth: 10–20 one-cubic-foot bags per 100 sq ft.
• 4–8 inch depth: 40–80 one-cubic-foot bags per 100 sq ft.

Installation

Rototill or spade the topsoil thoroughly into the top 3–4 inches of existing soil. This blends the layers and creates a uniform root zone.

Conclusion

Use the bag-count guide to order the right amount, then incorporate deeply for optimal lawn establishment.