According to the International Residential Code (IRC), when is a cricket required?

• A. In a chimney wider than 20 inches
• B. In a chimney with a width over 30 inches
• C. On all chimneys
• D. Never required

Answer: (B)

A cricket is required in the context of roof and chimney design to prevent water accumulation and facilitate proper drainage. The International Residential Code specifies that a cricket is necessary when a chimney's width exceeds 30 inches. This necessity arises because larger chimneys can obstruct the flow of water, leading to potential leaks and damage to the roofing system if not properly managed.

Using a cricket helps redirect the water away from the chimney, reducing the risk of buildup and enhancing the overall longevity and effectiveness of the roofing system. Therefore, understanding this requirement is crucial for ensuring compliance with building codes and promoting effective water management in chimney installations.