Building code: rise 7 to 7.75 inches, tread minimum 10 inches. Formula: 2 x rise + run = 24-25 inches for comfort. Number of treads equals risers minus one. Total run critical for space planning. Minimum 2 stringers for 36 inch width, 3 for wider.
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
Rise: 7-7.75 inches max, tread: 10 inch minimum, width: 36 inch minimum.
2 x rise + run = 24 to 25 inches. Example: 7 inch rise + 11 inch run = 25.
Minimum 2 for 36 inch width. Add center stringer for wider stairs or heavy use.