Chimney Sweep Glossary

This quick-reference glossary decodes the 12 most important chimney sweep terms every Colorado Springs homeowner should know—especially if your house was built before 1980. Learn what to watch for, when to call a pro, and how masonry quirks in older neighborhoods like Old Colorado City can hide costly trouble.

If your Colorado Springs home has a fireplace or wood stove, you’ll hear words like “creosote,” “damper,” and “Level 2 inspection.” Armadillo Chimney Inc. put together this plain-English glossary so you can spot issues early and book the right chimney sweep service before small problems become big repairs. We’ve been keeping older masonry safe in neighborhoods from Manitou Springs to Monument for years—let’s make sure your chimney stays in top shape.

Creosote

Creosote is the black, tarry, or flaky buildup that coats the inside of your chimney whenever you burn wood. It’s made of unburned wood particles and can look like shiny soot, sticky tar, or even hardened glaze. Creosote is highly flammable and the leading cause of chimney fires in Colorado Springs homes, especially in older masonry flues that don’t draft as well as modern ones. Read up on our full list of services page.

Flue

The flue is the vertical passage inside your chimney that carries smoke and gases from the fireplace or stove up and out of your home. In Colorado Springs, older flues are often single-wythe brick without a liner, which can crack and leak dangerous carbon monoxide. A properly sized and intact flue keeps heat in the firebox and protects your walls from heat damage. Read up on book a visit or ask a question.

Flue liner

A flue liner is a protective layer—made of clay tile, metal, or poured-in-place material—that lines the inside of your chimney’s flue. In older Colorado Springs homes, clay tiles often crack from freeze-thaw cycles on Pikes Peak’s foothills. A damaged liner can expose brick to heat and corrosive gases, risking a house fire or carbon monoxide leak.

Damper

The damper is the metal plate inside your chimney that you open to let smoke out and close to keep heat in when the fireplace isn’t in use. In many Colorado Springs homes built before 1980, the damper is rusted or warped, letting conditioned air escape up the chimney. A properly sealing damper can cut heating bills and improve indoor comfort.

Chimney crown

The chimney crown is the concrete or mortar “cap” on top of your chimney that keeps rain, snow, and ice out of the flue. In Colorado Springs, freeze-thaw cycles can crack a poorly built crown, letting water seep into the brick below. A cracked crown is often the first sign of bigger masonry trouble in older chimneys.

Chimney cap

A chimney cap is a metal or mesh cover that sits on top of your chimney crown to block leaves, critters, and rain while still letting smoke escape. Without one, Colorado Springs squirrels and birds often nest inside flues, creating fire hazards and blocking draft. A sturdy cap also prevents wind-driven rain from soaking your masonry.

Firebox

The firebox is the brick-lined chamber where your fire burns. In older Colorado Springs homes, the firebox mortar can crumble from decades of high heat and thermal shock. A crumbling firebox can collapse or let flames reach combustible framing, so it’s one of the first spots we check during a Level 2 inspection.

Smoke chamber

The smoke chamber is the tapered section above the firebox that funnels smoke into the flue. In many Colorado Springs homes, this area is built with oversized bricks and weak mortar, creating ledges where creosote piles up. A poorly shaped smoke chamber can cause drafting problems and dangerous back puffing on windy days.

Draft

Draft is the upward flow of air that pulls smoke out of your fireplace and up the chimney. In Colorado Springs, high-altitude air pressure and wind patterns can weaken draft, causing smoke to spill into your living room. A weak draft often points to a blocked flue, cracked liner, or improperly sized flue for your stove.

Spalling

Spalling is when moisture freezes inside brick or mortar, causing the surface to flake off like sunburned skin. In Colorado Springs, spalling is common on chimneys exposed to winter storms and rapid temperature swings. Left unchecked, spalling can hollow out bricks and expose the flue liner to heat and gases, risking a chimney fire.

Tuckpointing

Tuckpointing is the process of grinding out old, cracked mortar and replacing it with fresh, color-matched mortar to restore the joints between bricks. In older Colorado Springs homes, original lime mortar has often turned to powder, letting water seep in and freeze. Proper tuckpointing can double the life of your chimney’s masonry and prevent costly rebuilds.

Chimney flashing

Chimney flashing is the waterproof metal strip that seals the joint where your chimney meets the roof. In Colorado Springs, improperly installed or corroded flashing is a top cause of roof leaks and interior water stains. When flashing fails, water can run down the chimney and damage ceilings, walls, and even the attic framing.

Level 1 inspection

A Level 1 inspection is a basic visual check of readily accessible chimney parts—flue, liner, damper, crown, and flashing—performed from the roof and firebox. In Colorado Springs, we recommend a Level 1 inspection every year for wood-burning fireplaces. It’s the minimum standard to spot creosote buildup, cracks, or obstructions before they become hazards.

Level 2 inspection

A Level 2 inspection adds a video camera to examine the flue’s interior and hidden areas like the smoke chamber and smoke shelf. In older Colorado Springs homes with masonry issues or after a chimney fire, a Level 2 inspection is the gold standard. It reveals hidden cracks, missing liners, or deteriorating mortar that a basic check can miss.

CSIA certification

CSIA certification is the industry gold standard for chimney professionals, earned through exams on codes, safety, and best practices. At Armadillo Chimney Inc., every technician holds CSIA certification so Colorado Springs homeowners get accurate diagnoses and code-compliant repairs. It’s your guarantee that the advice you’re getting is up to date and trustworthy.

Frequently Asked Questions