A masonry chimney should extend at least how many feet above the highest point where it passes through the roof?

The correct distance for a masonry chimney to extend above the highest point where it passes through the roof is a minimum of 3 feet. This height is important to ensure that the chimney provides adequate draft and reduces the risk of smoke or harmful gases entering the living space. By extending 3 feet above the roofline, the chimney is less likely to be affected by turbulence caused by the roof's slope, which can disrupt the flow of exhaust gases.

Additionally, local building codes and best practices for masonry chimneys often dictate this minimum height to enhance safety and efficiency in venting combustion byproducts. Chimneys that are too short can also be more susceptible to downdrafts and may not effectively clear any potential obstructions, further complicating ventilation issues and possibly leading to dangerous situations.

Since the height requirement of 3 feet is established by standards in the construction and inspection industry, it is critical for homeowners and inspectors to adhere to this guideline to ensure proper function and safety of the chimney.