Which pair correctly reflects the code requirement for minimum stair tread depth and maximum riser height?

Which pair correctly reflects the code requirement for minimum stair tread depth and maximum riser height?

• A. 9 Inches; 8 Inches
• B. 11 Inches; 7 Inches
• C. 10 Inches; 7-3/4 Inches
• D. 8 Inches; 8 Inches

Answer: (C)

Stairs must meet code for safe use, with a clear minimum tread depth and a clear maximum riser height. The minimum tread depth is 10 inches, and the maximum riser height is 7-3/4 inches. The pair that matches these exact limits is 10 inches for tread depth and 7-3/4 inches for riser height, which is why it’s the best answer. Other options don’t reflect both limits: they either show a tread shallower than the minimum or a riser taller than the maximum.

Stairs must meet code for safe use, with a clear minimum tread depth and a clear maximum riser height. The minimum tread depth is 10 inches, and the maximum riser height is 7-3/4 inches. The pair that matches these exact limits is 10 inches for tread depth and 7-3/4 inches for riser height, which is why it’s the best answer. Other options don’t reflect both limits: they either show a tread shallower than the minimum or a riser taller than the maximum.