What is the 3-2-10 Rule for Chimney Height?

3-2-10 Rule for Chimney Height Example

Understanding what the 3‑2‑10 Rule Means 3 feet above the roof surface at the chimney’s shortest side (facing uphill). 2 feet higher than any structure or roof portion within a 10‑foot horizontal radius.This applies whether it’s a dormer, another roof plane, or nearby houses This isn’t just code—it’s physics. Adequate height ensures draft stability, prevents […]