Chimney Sweep Glossary

This Chimney Sweep glossary provides clear definitions for essential terms like creosote and flue liners, specifically for New London homeowners. Knowing what is creosote or a flue liner helps you understand maintenance needs and safety risks, empowering you to make informed decisions about your chimney care and heating system.

Owning a home in New London means preparing your fireplace for our windy coastal winters. Whether you are in a historic district or a new build, understanding these terms helps you talk to your technician with confidence. Explore our full list of services or request a free estimate to keep your home safe. We also help neighbors in Groton, CT maintain their hearths.

Creosote

Creosote is a sticky, highly flammable residue that builds up inside your chimney when wood burns. It ranges from a black powder to a hard glaze and is a leading cause of chimney fires. Regular sweeping removes this dangerous substance to keep your family safe.

Flue

The flue is the vertical passageway inside your chimney that carries smoke and toxic gases out of your home. A clear, correctly sized flue is essential for good airflow and preventing dangerous carbon monoxide from entering your living space.

Flue liner

A flue liner is a protective clay, metal, or concrete sleeve inside the flue that protects the chimney walls from heat and corrosion. If your liner is damaged, gases can leak into your home. Read our blog for more maintenance tips.

Damper

The damper is a metal plate located above the firebox or at the top of the flue. You open it to let smoke out when burning wood and close it when the fireplace is idle to keep warm air inside your house and prevent drafts.

Chimney crown

The chimney crown is the concrete or masonry top slab that seals the chimney's opening from the outside elements. It slopes downward to direct water away from the structure, preventing moisture damage that is common in New London's wet weather.

Chimney cap

A chimney cap is a metal cover with wire mesh screens installed on top of the flue. It stops rain, debris, and animals like squirrels from entering your chimney while allowing smoke to escape. Check our pricing guide for installation costs.

Firebox

The firebox is the interior chamber where you build and maintain the fire. It is built with firebrick and refractory mortar designed to withstand extreme heat. Cracks here can be a serious fire hazard and should be repaired promptly.

Smoke chamber

The smoke chamber is the tapered area above the firebox that funnels smoke toward the flue. Its smooth walls help compress smoke to create a strong draft. A poorly designed or parged smoke chamber can cause smoke to blow back into your room.

Draft

Draft is the suction that pulls air and smoke up the chimney. Proper draft relies on adequate height, temperature differences, and air pressure in your home. If you have smoke backing up, you likely have a draft issue that needs professional attention.

Spalling

Spalling is when moisture enters masonry and causes the brick face to peel, pop, or flake off. This is common due to New London's freeze-thaw cycles and weakens the structural integrity of the chimney. Contact us if you see brick chips.

Tuckpointing

Tuckpointing is the repair process where damaged or missing mortar between bricks is carefully removed and replaced with fresh mortar. This restores the structural stability of the chimney and prevents water from seeping inside the walls and causing damage.

Chimney flashing

Flashing is the metal seal installed where the chimney meets the roof. It creates a waterproof barrier to prevent rain from leaking into your attic or ceiling. Leaking flashing is a frequent cause of water stains in homes near the coast.

Level 1 inspection

A Level 1 inspection is a basic visual check of the easily accessible parts of your chimney and flue. It is performed if you have not changed your heating system and plan to use it as you have in the past.

Level 2 inspection

A Level 2 inspection is more thorough and includes a video scan of the flue interior. It is required during real estate transactions or after a chimney fire. Learn more about this process in our Chimney Sweep FAQ for New London Homeowners.

CSIA certification

CSIA certification means the chimney sweep has been tested by the Chimney Safety Institute of America. This credential indicates the technician has the knowledge to properly clean, inspect, and repair chimneys according to industry safety standards.

Frequently Asked Questions