How to Regrade a Lawn to Prevent Basement Flooding

Grading Standards

• Final slope: 1–2% away from foundation (1–2 ft drop per 100 ft).
• Remove all debris, rocks, and construction wood (causes future mushrooms).
• Eliminate depressions and high spots.

Soil Preparation

1. Rototill 6+ inches deep.
2. Amend heavy clay with compost, rotted manure, peat, or quality topsoil—incorporate, don't layer.
3. Avoid sand for clay amendment.
4. Incorporate starter fertilizer (10-10-10 or 12-12-12) based on soil test.

Establishment

Seed or sod after grading. Soil test via Extension is strongly recommended to address pH and nutrient deficiencies before planting.