Key takeaways
- The crown seals the top of the masonry and sheds water
- The cap covers the flue and blocks animals and rain
- The liner protects the masonry and house from heat and gases
- Each can be replaced without rebuilding the stack
A chimney is a small system of parts working together.
The crown
The crown is the cement slab at the top of the masonry. It should slope away from the flue and overhang the brick so water drips clear.
The cap
The cap sits over the flue. It keeps out rain, birds and animals, and its screen stops sparks.
The liner
The liner is the inner pipe. It contains heat and smoke and shields the brick. Old clay tiles crack and a new liner can be installed from the top.
Together
When all three are sound, the chimney lasts far longer and draws better.
Related services
Questions about your own masonry? Call or text 800-224-9245, or use the estimate form below.