At Eco Grizzly, we believe every homeowner should understand how a masonry chimney diagram helps visualize the parts that make up your fireplace system. Knowing how your chimney works isn’t just informative—it helps you spot potential issues early and ensures your fireplace runs safely and efficiently. Below is a detailed diagram and explanation of each essential chimney component.

Masonry Chimney Diagram & Anatomy Explained

How to Read a Masonry Chimney Diagram

1. Chimney Cap

The chimney cap is a protective cover at the very top of the chimney. It keeps out rain, debris, and animals, while preventing downdrafts and helping control sparks.

2. Chimney Crown

Sitting just below the cap, the chimney crown is a concrete or cement layer that slopes outward to direct water away from the flue and masonry structure.

3. Flue Tile

The flue is the inner liner of your chimney—typically made of terra cotta—that channels smoke and gases safely out of the home. Properly lined flues improve draft and protect the masonry from corrosive byproducts.

4. Mortar Joint

Mortar joints are the bonding layers between the flue tiles. If these deteriorate, it can lead to dangerous gas leaks or chimney fires.

5. Smoke Chamber

This area funnels smoke from the firebox into the flue. Its smooth, angled walls improve draft and minimize turbulence.

6. Damper

Located just above the firebox, the damper opens to allow smoke to escape and closes to conserve energy when the fireplace isn’t in use.

7. Smoke Shelf

Positioned behind the damper, the smoke shelf catches debris and helps deflect downdrafts, aiding in proper smoke flow.

8. Face Brick

These are the visible exterior bricks of your chimney. In addition to providing structural support, they offer aesthetic appeal.

9. Lintel

A horizontal support beam above the firebox opening that prevents the bricks from collapsing inward.

10. Firebox

The heart of the fireplace—where the fire burns. It must be built with fire-resistant materials to withstand extreme temperatures.

11. Hearth Extension

This is the brick or stone area in front of the firebox that protects your flooring from heat and stray embers.

Why a Masonry Chimney Diagram Matters

Routine chimney inspections and cleanings are crucial to maintaining the safety and longevity of your fireplace system. At Eco Grizzly, our expert technicians are trained to inspect every part of your chimney, from the cap to the hearth extension, ensuring your system functions efficiently and safely.