The report translator

Understand the words in your chimney report.

Use this glossary to ask clearer questions. A term describes a component or condition; it does not establish the severity of a finding.

Flue

The passage carrying combustion products to the outdoors. A chimney may contain more than one flue.

See the related service scope

Liner

The inner system forming the flue passage. Its suitability depends on the appliance, fuel and installation.

See the related service scope

Crown

The sloped top surface of a masonry chimney that sheds water away from its body.

See the related service scope

Cap

A cover or termination at the top of a flue or chimney. Compatibility matters as much as weather protection.

See the related service scope

Flashing

The weather-resistant connection where a chimney meets the roof.

See the related service scope

Creosote

Combustible deposits associated with wood combustion. Their form and removal needs vary.

See the related service scope

Repointing

Removing deteriorated mortar to an appropriate depth and installing suitable replacement mortar in the joints.

See the related service scope

Spalling

Flaking or breaking away of a masonry surface; assessment should consider the underlying cause.

See the related service scope

Smoke chamber

The transition above a masonry fireplace that channels smoke toward the flue.

See the related service scope

Damper

A component that controls an opening in certain fireplace systems. Operation depends on the appliance design.

See the related service scope

Draft

The pressure-driven movement of gases through a venting system. Many building and appliance factors affect it.

See the related service scope

Connector

The section connecting an appliance to its chimney or vent; it has its own installation and maintenance requirements.

See the related service scope