US lawWashingtonRegulationsTitle 296 — LABOR AND INDUSTRIES, DEPARTMENT OFChapter 296-24 — GENERAL SAFETY AND HEALTH STANDARDS296-24-76521WAC 296-24-76521WAC 296-24-76521. Open risersLast amended: 1973Year: 2026Length: 12 wordsOfficial source Stairs having treads of less than 9-inch width should have open risers.PreviousWAC 296-24-76519NextWAC 296-24-76523