Staircase Geometry and Safety Codes
Designing stairs requires precise math to ensure they are comfortable and safe to walk up. The International Residential Code (IRC) enforces strict tolerances for riser heights and tread depths to prevent tripping hazards.
Key IRC Stair Code Requirements
- Maximum Riser Height: 7-3/4 inches.
- Minimum Tread Depth (Run): 10 inches (or 11 inches depending on local code).
- Headroom: A minimum vertical clearance of 6 feet 8 inches along the staircase path.