How many inches should the flue liner tile project above the crown?

The correct amount for the flue liner tile to project above the crown is four inches. This projection is crucial for several reasons. First, a proper projection helps to create a reliable draft by ensuring that any smoke or gas can escape easily without obstruction. Additionally, this height helps to protect the crown from damage, as it prevents water from pooling at the top of the chimney, which can lead to deterioration over time.

Having a consistent and adequate height makes it more difficult for downdrafts or rain from entering the flue system, thereby maintaining optimal operation and efficiency of the chimney. The four-inch guideline is established by codes and best practices to promote safety and functionality of chimney systems.

Inadequate projections may not provide sufficient clearance for moisture and could lead to various issues, including water intrusion or compromised chimney effectiveness.