What Those Noises in Your Crestwood Chimney Are Actually Telling You
By Dan Joel, Elite Sweepers Inc.
A chimney is supposed to be quiet. When it is not, the sound it makes is often the most useful diagnostic you will get all season, because different problems genuinely make different noises. Autumn is when Crestwood homeowners start hearing them. The flue cools off hard overnight, animals are hunting for somewhere warm to spend the winter, and the first fires of the year heat metal that has sat cold since March. Here is what each sound usually means and how quickly it needs attention.
Rustling, scratching or chirping
The short answer: something has moved into the flue, and the noise matters less than the nest it is building. Birds, squirrels and raccoons all treat an uncapped chimney as a sheltered vertical hollow, which is exactly what they look for this time of year. Chimney swifts are federally protected migratory birds, so an active nest cannot simply be pulled out; timing and technique matter. The real hazard is not the animal, though, it is the packed twigs and leaves left behind. That material blocks the flue, and a blocked flue pushes combustion gases back into the house instead of out the top. If you hear scratching, do not light a fire until the chimney has been looked at.
Ticking, pinging and popping while a fire burns
The short answer: that is usually metal expanding, and in moderation it is normal. Stainless liners, factory-built fireboxes and metal chimney chases all grow slightly as they heat and contract again as they cool, which produces light ticking through the first hour of a fire and again as it dies down. What is not normal is loud, irregular banging, or a metallic rattle you can hear from another room. Those point to liner sections that have worked loose at their joints or support hardware that has failed, and both are worth a look before the heating season is fully underway.
Dripping or trickling inside the chimney
The short answer: water is getting in, and water is the most expensive thing that can happen to masonry. Rain enters through a cracked crown, a missing or damaged cap, or failed flashing where the chimney passes through the roof. Once inside, it mixes with creosote and soot to form an acidic slurry that eats mortar joints and corrodes metal liners and dampers from the inside out. A dripping sound after a storm is an early warning, and it is far cheaper to answer in October than to answer in March after a winter of freeze and thaw has widened every joint it reached.
A deep roar or a freight-train sound
The short answer: treat that as a chimney fire until proven otherwise. A loud rushing roar, often with cracking or popping underneath it and dense smoke or sparks at the top of the chimney, is burning creosote inside the flue. Get everyone out of the house and call 911 first. Afterward, the chimney needs a thorough internal inspection before another fire is lit, because the heat of a flue fire commonly cracks clay tiles and warps metal liners in ways that are invisible from the firebox. A full chimney inspection is the only honest way to know whether the flue is still safe to use.
Whistling or moaning on windy days
The short answer: air is moving fast across an opening it did not used to move across. A damaged or partially detached cap, a flue that is oversized for the fireplace, or a damper sitting slightly ajar will all sing when the wind comes off the prairie the way it does here in late fall. It is rarely dangerous on its own, but it is a reliable sign that something at the top of the chimney has shifted, so the cap and crown are the first place to look.
What we listen for on a Crestwood service call
The short answer: we match the sound you describe to what the camera and the flashlight actually find, rather than guessing from the driveway. Every visit across our Crestwood chimney sweep service area starts with the same walkthrough of the firebox, damper, smoke chamber and flue, and you get the price before any work starts, exactly as listed on our pricing page. If the noise turns out to be something you can handle yourself, we will say so, and our DIY chimney maintenance guide covers the checks that do not need a technician at all.
If your chimney has started making a noise it did not make last winter, get it identified before the fireplace is in daily use. Elite Sweepers Inc. is insured and bonded, quotes the price up front, and answers the phone seven days a week from 7 AM to 7 PM. Call (708) 432-3977 and describe what you are hearing.
Crestwood chimney noise questions, answered
What does scratching in the chimney usually turn out to be?
Most often a bird, a squirrel or a raccoon that came in through an open flue top. The animal itself is a nuisance, but the nesting material it leaves behind is what blocks the flue and creates a real hazard.
Is it safe to light a fire to drive an animal out?
No. It is dangerous for the animal, and if nesting material is already packed into the flue the smoke has nowhere to go but back into the room. Have the chimney cleared and capped instead.
Why does my chimney tick after the fire has gone out?
Metal components contract as they cool, and that movement makes a light ticking sound for an hour or so afterward. It is normal for liners and factory-built fireplaces, and it should be quiet rather than loud or irregular.
I hear dripping after it rains. How urgent is that?
Urgent enough to schedule before winter. Water inside a flue mixes with soot into an acidic mixture that attacks mortar and metal, and freeze-thaw cycles then widen every joint the water reached.
What should I do if I hear a roaring sound during a fire?
Get everyone out of the house and call 911, because a deep roar with popping underneath it is the sound of a chimney fire. Do not use the fireplace again until the flue has been inspected internally.
Can wind alone make a chimney whistle?
Yes, when it passes over a damaged cap, an oversized flue or a damper that is not fully seated. The sound is not usually dangerous, but it means something at the top of the chimney has moved and should be checked.
Do chemical repellents keep animals out of a flue?
They are unreliable and the fumes belong nowhere near a flue that vents into your home. A properly sized stainless cap is the only fix that keeps working year after year.
Does a rattling damper mean it has to be replaced?
Not necessarily. A loose pivot pin or worn linkage can often be tightened or rebuilt in place. Replacement is the answer when the plate itself has warped or the frame has cracked.
Published October 11, 2026