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Proper Drainage Around Foundation Vents

To raise grade without blocking foundation vents, lay landscape fabric, then large rock (2+ inches) to create a drainage layer. Cover with another fabric layer, then soil. For grass, you need ~25 inches of soil over the gravel. This prevents clogging and allows water to move away. Slope the finished grade away from the house.

Landscaping and Design: Waterproofing a Below-Grade Garage: Interior Sealants vs. Exterior Barriers; How to Test Soil Drainage; Planting Shrubs in Slow-Draining Soil; "Plastic Soil" Term: Not a Standard Term; Covering a French Drain in a Clay Yard; Improving Drainage in Container Plants: Why Your Potting Mix Holds Too Much Water; Raising Soil Grade Around a Foundation for Better Drainage; Grading Fill Against Foundation: Soil Type & Compaction; Fixing a Waterlogged Clay Yard: Drainage, Grading, and Planting; Soil Drainage: Testing, Types & Solutions for Healthy Gardens

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