What is the ideal height for the flue liner tile above the roof?

The ideal height for the flue liner tile above the roof is 3 inches. This height is established to ensure that the flue liner effectively extends above the roofline, which is essential for proper venting of gases and to prevent downdrafts that can cause backdrafting of combustion gases into the home. By having the flue liner at least 3 inches above the roof, it also helps to reduce the potential for blockages from debris, snow, or other obstructions that could affect the chimney’s performance.

Additionally, building codes often specify this minimum height as a standard for safety and efficiency in venting systems, ensuring that the chimney draws properly and operates safely. This understanding is crucial for home inspectors when assessing chimney installations and ensuring they meet applicable safety standards.