Chimney Sweep Glossary

This plain-English glossary explains the 12 most important chimney parts and services every Kenmore homeowner should know. Learn what to watch for, when to call us, and how small fixes can prevent big headaches in your Kenmore fireplace this winter.

Whether you just moved into a 1920s Kenmore bungalow or you’ve lived in your split-level for years, understanding chimney basics keeps your home safer and your fireplace working right. Matthew Clark Chimney LLC has been sweeping and inspecting chimneys across Kenmore and the surrounding communities for years. See the full list of services we offer to keep your flue clean and safe.

Creosote

Creosote is the black, tarry, or flaky buildup left behind when wood burns incompletely. It coats the inside of your flue like soot, but it’s far more dangerous: creosote can ignite and cause a chimney fire. In Kenmore’s damp winters, creosote builds up faster, so we recommend a sweep every year if you use your fireplace regularly.

Flue

The flue is the vertical passage inside your chimney that carries smoke and gases safely outside. It’s usually lined with clay tile or metal to protect your home from heat and corrosion. Think of it as the chimney’s airway—keep it clear and intact to avoid smoke leaks or carbon monoxide risks in your Kenmore home.

Flue liner

A flue liner is a protective layer inside the flue that shields your chimney walls from heat and corrosive byproducts. Most Kenmore chimneys have clay tile liners, but metal or cast-in-place liners are also common. A cracked or missing liner can let heat reach wood framing, raising fire risk—schedule an inspection if you’re unsure.

Damper

The damper is a movable metal plate at the top of your fireplace that opens to let smoke out and closes to keep warm air in when the fire’s out. If your damper sticks or won’t close fully, you’re losing heat and inviting drafts. A quick adjustment or replacement can save you money on heating bills in a Kenmore winter.

Chimney crown

The chimney crown is the concrete or mortar cap on top of your chimney that keeps rain, snow, and debris out of the flue. A cracked crown lets water seep in, causing bricks to spall and mortar to crumble. In Kenmore’s freeze-thaw climate, a solid crown is your first line of defense against costly damage.

Chimney cap

A chimney cap is a metal screen or hood that sits on top of your chimney to block rain, leaves, and animals while still letting smoke escape. Without one, your Kenmore chimney can become a bird hotel or a water funnel—both of which lead to expensive repairs. We install sturdy, code-compliant caps during every sweep.

Firebox

The firebox is the brick-lined chamber where you build your fire. It’s designed to withstand intense heat, but cracks or missing mortar can let heat escape into your walls. If your Kenmore fireplace has a crumbling firebox, it’s time for a repair before the next burn season.

Smoke chamber

The smoke chamber is the sloped area just above the firebox that funnels smoke into the flue. A poorly built or damaged smoke chamber can trap smoke in your Kenmore living room or allow embers to escape. We check its shape and condition during every inspection to ensure safe drafting.

Draft

Draft is the upward flow of air that pulls smoke out of your fireplace and up the chimney. Good draft means a clean, hot fire and no smoke spilling into your Kenmore home. Poor draft can be caused by blockages, a cold flue, or a damaged chimney—let us diagnose the issue before you light another fire.

Spalling

Spalling is when bricks or masonry crumble or flake due to water damage, freeze-thaw cycles, or poor mortar. In Kenmore’s damp climate, spalling bricks are a red flag that your chimney is absorbing too much moisture. Left unchecked, it can weaken the entire structure and lead to collapse.

Tuckpointing

Tuckpointing is the process of removing old, cracked mortar from between bricks and replacing it with fresh mortar to restore strength and waterproofing. It’s like giving your Kenmore chimney a fresh seal of armor against the elements. We match the mortar color and texture to blend seamlessly with your existing brickwork.

Chimney flashing

Chimney flashing is the waterproof metal strip that seals the joint where your chimney meets the roof. If it’s bent, cracked, or improperly installed, water can leak into your attic or walls. Kenmore homes with older flashing often show water stains in the ceiling—don’t ignore it.

Level 1 inspection

A Level 1 inspection is the standard visual check we perform during every chimney sweep. We look for obstructions, creosote buildup, and visible damage inside the flue, firebox, and smoke chamber. It’s quick, affordable, and meets most home insurance requirements for Kenmore homeowners.

Level 2 inspection

A Level 2 inspection is a more thorough exam that includes a camera scan of the flue and a review of accessible attic and crawl spaces. We recommend it if you’ve had a chimney fire, a recent earthquake, or if you’re buying or selling your Kenmore home. It’s the gold standard for safety and compliance.

CSIA certification

CSIA certification means our technicians have completed rigorous training from the Chimney Safety Institute of America and stay current with the latest codes and best practices. When you hire a CSIA-certified sweep in Kenmore, you’re getting expertise you can trust—no shortcuts, no guesswork. Meet our certified team.

Frequently Asked Questions