What is the minimum required chimney width for which a cricket is required?

The minimum required chimney width for which a cricket is required is indeed 30 inches. A cricket, also known as a saddle, is a construction feature used to divert water around the chimney. It is particularly necessary when the chimney width exceeds a certain size, as this reduces the risk of water pooling on the roof, which can lead to leaks and water damage.

When chimneys are wide enough, specifically starting from 30 inches, they create a situation where simply relying on the chimney's design may not adequately manage water runoff. By using a cricket, it helps to channel rainwater away from the base of the chimney, thus preventing potential issues such as deterioration of roofing materials or rot in the surrounding area.

Understanding this threshold is important for compliance with building codes and for ensuring long-term integrity and performance of the roofing system around chimneys. The other options reflect widths that are either smaller or larger than this critical measurement for requiring a cricket, which do not align with standard building practices.