Chimney Sweep Glossary

This chimney sweep glossary explains the terms Seattle homeowners hear most — in plain English. Knowing what these words mean helps you understand quotes, ask better questions, and recognize quality work, so you're never in the dark when hiring a chimney sweep professional in Seattle.

Brandon L. Chimney Co. believes an informed customer is a confident one. This glossary defines the chimney sweep terms that come up during our services and on every written estimate. Bookmark it, and reach out anytime a term isn't clear — we're always glad to explain.

Creosote

A tar-like, highly flammable residue that builds up inside a chimney flue as wood smoke cools and condenses. Heavy creosote is the leading cause of chimney fires, which is why annual sweeping matters.

Flue

The vertical passage inside a chimney that carries smoke, gases, and combustion byproducts safely up and out of the home.

Flue liner

A protective inner layer (clay tile, metal, or cast-in-place) inside the flue that contains heat and corrosive byproducts, protecting the surrounding masonry and improving draft. If it shows up on your quote, Brandon L. Chimney Co. will walk you through it in plain language.

Damper

A movable metal plate that opens to let smoke escape during a fire and closes to stop heated or cooled air from leaking out when the fireplace isn't in use.

Chimney crown

The sloped concrete slab at the very top of the chimney that sheds rainwater away from the flue and masonry to prevent water damage. Brandon L. Chimney Co. is glad to explain how this affects your Seattle home during a free estimate.

Chimney cap

A metal cover with mesh sides fitted over the flue opening that keeps out rain, animals, and debris while acting as a spark arrestor. If it shows up on your quote, Brandon L. Chimney Co. will walk you through it in plain language.

Firebox

The chamber where the fire actually burns, built from heat-resistant firebrick and refractory mortar to withstand extreme temperatures. If it shows up on your quote, Brandon L. Chimney Co. will walk you through it in plain language.

Smoke chamber

The angled area just above the firebox that funnels smoke from the wide fireplace opening up into the narrower flue. If it shows up on your quote, Brandon L. Chimney Co. will walk you through it in plain language.

Draft

The upward flow of air that pulls smoke and gases out through the chimney; poor draft lets smoke spill back into the room. Our technicians point terms like this out to Seattle homeowners as part of the work we do.

Spalling

Flaking, chipping, or crumbling of brick caused by trapped moisture freezing and thawing — a sign the masonry needs repair before it worsens.

Tuckpointing

Grinding out deteriorated mortar joints and refilling them with fresh mortar to restore the strength and weather-resistance of the masonry. Brandon L. Chimney Co. is glad to explain how this affects your Seattle home during a free estimate.

Chimney flashing

The metal sheeting that seals the joint where the chimney meets the roof, preventing water from leaking into the home along that gap. Brandon L. Chimney Co. is glad to explain how this affects your Seattle home during a free estimate.

Level 1 / Level 2 inspection

Standardized inspection tiers from the NFPA: Level 1 is a basic visual check of accessible areas; Level 2 adds a video scan of the flue and is required after chimney changes, property sales, or a chimney fire.

CSIA certification

Credentialing from the Chimney Safety Institute of America, indicating a technician has passed a national exam on chimney and venting safety. Our technicians point terms like this out to Seattle homeowners as part of the work we do.

Frequently Asked Questions