Minimum 2% slope (1/4 inch per foot) away from foundations for drainage. ADA ramps maximum 8.33% (1:12 ratio). Erosion risk increases above 15% slope. Mowing difficult above 25%. Convert: 2% equals 1:50 ratio or 1.15 degrees.
Quick Tips
- Always order 10-15% extra materials for waste
- Check local building codes before starting
- Measure twice, cut once — verify all inputs
Frequently Asked Questions
2% minimum (1/4 inch drop per foot, 1:50 ratio) away from buildings.
Maximum 1:12 ratio (8.33% or 4.76 degrees) for wheelchair accessibility.
15-25% requires caution. Over 25% difficult to mow and prone to erosion.