Under what condition is a chimney saddle required?

A chimney saddle, also known as a cricket, is a structural component designed to divert water away from the chimney and prevent it from pooling around the base, which could lead to leaks and water damage. This component is required specifically under certain conditions related to its dimensions and position.

The requirement for a chimney saddle arises when the upper side width of the chimney is 750mm or more. In these cases, the chimney is likely to create a situation where water can accumulate on the roof surface, particularly when there is sloped roofing around it. The saddle helps redirect rainwater, minimizing the risk of water-related problems.

In contrast, the dimensions and connection types of the chimney or external weather conditions, such as snowfall, do not dictate the need for a chimney saddle. While these factors may play a role in overall chimney installation considerations, they do not specifically meet the structural requirements that necessitate the installation of a chimney saddle.