For chimneys with a dimension parallel to the ridgeline, a chimney cricket is required for what minimum size?

A chimney cricket is a sloped surface constructed on the high side of a chimney that helps divert water away from the chimney and prevent water pooling on the roof. This is essential in preventing water penetration that can lead to deterioration of the chimney and roof.

In the case of chimneys with dimensions parallel to the ridgeline, building codes generally specify the size at which a cricket is required. The minimum size for a chimney that necessitates a cricket is typically defined as 30 inches. If the dimension of the chimney parallel to the ridgeline exceeds this measurement, a cricket is required to manage water runoff effectively.

Smaller chimneys (under 30 inches) may not require this modification because the slope of the roof can typically handle the amount of water runoff without needing additional assistance in redirecting it. As chimneys increase in size, the risk of water accumulation increases, making it prudent to incorporate a chimney cricket to maintain the structural integrity and longevity of both the chimney and the surrounding roof area.