Chimneys must be provided with crickets when the dimensions parallel to the ridgeline exceed how many inches?

Chimneys must be provided with crickets when the dimensions parallel to the ridgeline exceed 30 inches to ensure effective water drainage. Crickets, or saddle structures, are designed to redirect water away from the chimney to prevent pooling and potential water damage, which can lead to leaks or deterioration of the roofing materials around the chimney.

When the width of the chimney is greater than 30 inches, the risk of water accumulation increases, making the installation of crickets essential for maintaining the integrity of the roofing system. This requirement is grounded in best practices for roofing design and helps mitigate the risk of structural damage and moisture intrusion, which can adversely affect both the chimney and the surrounding roof space.

Understanding these specifications is important for maintaining compliance with building codes and ensuring the durability and safety of residential structures. Therefore, the correct answer reflects industry standards aimed at enhancing the functional performance of chimneys in relation to the roof design.