Category: Chimney Safety

Leave about an inch of ash under the grate through the burning season – it insulates the hearth and helps the next fire catch – and shovel out the rest once it builds past roughly three inches. Every scoop you remove goes into a metal container with a lid, set outside on a non-combustible surface, and stays there at least 72 hours before it goes anywhere near a trash can.

Why a little ash helps and a lot hurts

A thin ash bed is genuinely useful. It reflects heat back up into the fuel, protects the firebox floor from the direct bite of the coals, and gives kindling a warm base to ignite against. Wood-burners have known this for generations and it holds up.

Past about three inches, the benefit reverses. A deep bed crowds the grate, chokes the airflow coming up from underneath, and forces the fire to burn cooler and dirtier. Cooler smoke deposits more creosote on the way up the flue, which is how a housekeeping habit turns into a chimney problem. Deep ash also holds moisture, and wet ash sitting against firebox brick and mortar joints is corrosive over time.

The exception is gas. If you have a gas log set or an insert there is no ash bed to manage, and nothing in that firebox should be shoveled – the media in there is placed deliberately and moving it can change how the appliance burns. That is a job for gas fireplace service, not a shovel.

The disposal part is the part that starts fires

This is where people get hurt, and it is worth being blunt about it. Wood ash insulates itself. Embers buried in a pile of ash can hold enough heat to ignite paper or cardboard days after the fire appears to be out – long after the surface is cool to the touch, and long after it seems reasonable to still be worrying about it. We treat every scoop as live for at least 72 hours, and in practice we tell customers to go a week if the container is sitting anywhere near the house.

We mentioned this briefly when writing about what not to burn in a fireplace. Here is the routine in full:

• Use a metal bucket or ash can with a metal lid. No plastic, no paper bag, no cardboard box, and no shop vacuum – a standard vacuum will pull an ember straight into a bag of dust.
• Mist the ash lightly with water as you shovel to keep it from going airborne. Do not soak it into a slurry unless it is going straight onto the garden.
• Set the closed container outside, on concrete or bare dirt, well away from the house, the deck, the fence, the garage and the woodpile. Not on a wooden porch. Not in an attached garage.
• Leave it at least 72 hours. Then, if it is cold all the way through, bag it and put it in the trash.

Cooled, fully dead wood ash from untreated firewood can also go on a compost pile or into garden beds in small amounts – it is alkaline and will raise soil pH, so go light. Never spread ash from manufactured logs, painted or treated wood, or anything with charcoal briquettes mixed in.

A few habits that keep the firebox in better shape

Wait until the fire has been out at least 24 hours before shoveling, unless you enjoy chasing sparks. Take the ash down to about an inch rather than scraping to bare brick, because bare brick takes a beating. At the end of the season, remove all of it, since ash left sitting all summer draws humidity and produces the sour smell that turns up on the first warm, damp week. That particular odor in Oswego homes is very often nothing more than leftover ash.

While the firebox is empty, look at it. Missing mortar between firebrick, cracked brick faces, or a floor that has started to crumble are all worth mentioning at your next visit. Our DIY guide covers what is reasonable to check yourself. The rest of the system – the smoke shelf, the flue, the crown – needs a professional sweeping, because the majority of what accumulates in a chimney is nowhere you can reach from the living room.

Book a sweeping in Oswego

We are a few minutes away on Station Drive, out seven days a week, 7am to 9pm, insured and bonded. If your firebox has a season of ash in it and you would rather it came out properly, call and we will bring the vacuum.

Call (630) 451-4178

Written by Josh Amber, co-owner of Ember Chimney Sweepers, Oswego IL. Published October 20, 2026.

If smoke rolls into the room the moment your furnace, range hood or clothes dryer starts, the chimney probably is not blocked – it is losing a tug-of-war for air. Exhaust appliances in a tightly built house can pull well over 100 cubic feet of air per minute out of the building, and the easiest place for replacement air to get back in is straight down the coldest flue in the house.

Draft reversal is an air-supply problem, not a soot problem

A chimney drafts because the column of warm air inside it is lighter than the cold air outside, so it rises and drags combustion gases along with it. The pressure difference doing that work is tiny – a few thousandths of an inch of water column on a mild day. Any fan that removes air from the house faster than the house can replace it will overwhelm that small pressure and reverse the flow. The flue then behaves like a supply vent instead of an exhaust, and whatever is sitting in it comes down into the room: cold air, soot odor, and on a bad day, combustion gases from an appliance that shares the chimney.

That is why the problem is intermittent. Homeowners in North Aurora usually describe it as the fireplace only smoking sometimes, and the pattern almost always tracks something else switching on rather than anything about the fire itself.

The appliances competing for the same air

• The furnace or water heater. An atmospherically vented gas appliance needs its own supply of combustion air. Put one in a sealed mechanical room or a basement with new foam overhead and it will take that air from wherever it can find it, including your fireplace flue.
• The kitchen range hood. This is the single biggest offender in most homes. High-capacity hoods move 600 CFM or more, which is enough to reverse a fireplace all by itself.
• Bath fans and the clothes dryer. Individually modest, but they run for long stretches, and several at once adds up quickly.
• The upper floors themselves. Warm air escaping through attic bypasses and recessed light housings creates steady suction lower in the house. An open flue is a convenient make-up path.

Newer and recently air-sealed houses have this trouble more often than drafty old ones, which surprises people. Tightening a house is good for the heating bill and hard on natural-draft venting.

A ten-minute test you can run yourself

Do this with no fire burning. Close every window. Open the damper and hold a lit stick of incense just inside the fireplace opening, near the top, and watch which way the smoke travels. Now have someone switch on the range hood at high, the dryer and both bath fans, and watch again. If the smoke was drifting up the flue and now curls back into the room, you have just measured a pressure problem in your own house, and no amount of brushing will fix it.

Then crack a window six inches on the windward side and repeat. If the draft recovers, the house needs make-up air. That is worth knowing before anyone quotes you a repair.

What actually fixes it

The fix depends on what the test showed. Sometimes it is a make-up air path – a dedicated duct to the mechanical room, or a passive inlet. Sometimes the flue is oversized for the appliance, or the chimney is too short relative to the roofline and never builds a strong enough column to begin with. And sometimes it really is an obstruction or a heavy creosote layer narrowing the flue, in which case a chimney sweeping restores the cross-section and the draft comes back on its own.

Telling those apart takes a chimney inspection rather than a guess. We work to NFPA 211, the National Fire Protection Association standard for chimneys, fireplaces, vents and solid fuel-burning appliances, which defines what each inspection level has to cover – including a recorded camera scan of the flue interior at Level 2. A Level 1 inspection is starting at $99 and a Level 2 is starting at $199; the current figures live on our pricing page.

One thing worth saying plainly. If your furnace or water heater vents into a masonry chimney and you are seeing reversal, treat it as urgent rather than annoying. Reversed draft on a fuel-burning appliance can push combustion gases into the living space. Make sure your carbon monoxide alarms work, and get the venting looked at.

Have the draft checked before the cold settles in

We cover North Aurora and the rest of the Fox Valley seven days a week, 7am to 9pm, insured and bonded. Josh and Jack Amber grew up in Oswego and have 35 years of combined experience between them. If your fireplace smokes when other appliances run, call us and we will test the pressure in the house instead of simply running a brush down the flue.

Call (630) 451-4178

Written by Josh Amber, co-owner of Ember Chimney Sweepers, Oswego IL. Published October 17, 2026.

Most chimney fires are not the roaring, dramatic kind; many burn slowly and quietly, and the homeowner never knows one happened. The clearest signs afterward are puffy, honeycomb-textured creosote, a warped metal damper or cap, cracked flue tiles, and flakes of burnt creosote on the roof or ground. If you see any of them, stop using the fireplace until the flue has had a Level 2 inspection.

Why chimney fires go unnoticed

A fast chimney fire is hard to miss: a loud roaring or rumbling noise, dense smoke, and sometimes flames or sparks shooting out of the top. The slow kind is different. Creosote in the flue smolders at very high temperatures without enough air to flare, and from inside the house the fireplace may seem to be burning normally.

Both kinds can do the same damage. The heat can crack clay flue tiles, distort metal liners, and in older chimneys reach nearby framing through gaps in the masonry. Once the liner is cracked, the next ordinary fire can send heat and combustion gases where they were never meant to go.

The signs to look for

• Puffy or honeycombed creosote. Burnt creosote swells into a light, porous, almost popcorn-like texture that looks very different from ordinary flaky deposits.
• Warped or discolored metal. A damper that no longer closes flat, a cap that looks bent or heat-stained, or a metal chimney section that is visibly distorted.
• Cracked or missing flue tiles. Pieces of clay tile landing on the smoke shelf or in the firebox are a serious warning.
• Creosote flakes outside. Chunks of burnt creosote on the roof, in the gutters or on the ground near the chimney.
• Cracks in exterior masonry that were not there before, or heat damage to roofing material around the chimney.
• Smoke in odd places, such as the attic or an adjacent room, when the fireplace is in use.

None of these requires going on the roof to spot. A flashlight up past the damper, binoculars from the yard, and a look at the smoke shelf will show most of them.

What NFPA 211 says happens next

We work to NFPA 211, the National Fire Protection Association’s standard for chimneys, fireplaces, vents and solid fuel-burning appliances. It calls for a Level 2 inspection after an event that could have damaged the chimney, and a chimney fire is exactly that kind of event.

A Level 2 includes a recorded video camera scan of the flue interior, because that is the only way to see cracks in the liner along the full height of the chimney. Depending on what the camera shows, the answer might be a thorough sweep, repairs to the tile, or relining, which we only quote once we have seen the damage. Details are on our chimney inspection page, and rates are on the pricing page.

Preventing the next one in Plano

Chimney fires start with creosote, so prevention comes down to burning dry, seasoned wood, giving fires enough air, and having the flue swept once deposits build up. Plano has a mix of older homes near the historic downtown and newer subdivisions, and we find heavy creosote in both when a fireplace sees steady use without regular sweeping. If you are in Plano, a yearly chimney sweep is the simplest protection there is.

Think there may have been a chimney fire?

Ember Chimney Sweepers is two brothers from Oswego, Josh and Jack Amber, with 35 years of combined experience between them. We are insured and bonded and we take calls every day of the week from 7am to 9pm. If you are seeing any of the signs above, call before you light another fire.

Call (630) 451-4178

Written by Josh Amber, co-owner of Ember Chimney Sweepers, Oswego IL. Published October 16, 2026.

Creosote forms in three stages: a dry, sooty powder that a standard brush removes; a crunchy, flaky layer that needs rotary tools; and a hard, shiny glaze that brushing will not touch at all. The stage matters more than the thickness, because third-stage glaze is the most flammable and the hardest to get out. The only reliable way to know which one you have is to have someone look up the flue.

Stage one: soot you can brush out

First-stage creosote is a fine black or dark brown powder that coats the flue walls after ordinary fires with dry wood and a decent draft. Rub it and it smears like charcoal. A properly sized brush pulled through the flue takes nearly all of it off in one pass, along with whatever has collected on the smoke shelf.

This is the stage a yearly chimney sweep is designed to deal with. The widely used rule of thumb in the trade is to sweep once deposits reach about an eighth of an inch, because even soft soot becomes fuel for a flue fire once there is enough of it. Most wood-burning households that use a fireplace through a normal Illinois winter reach that point within a season.

Stage two: flakes that need more than a brush

Second-stage creosote looks like crisp black flakes or a rough, crusty coating, sometimes with a slightly shiny surface. It forms when smoke cools too quickly on the way up: a damper not fully open, fires smoldered overnight, wood that is not fully seasoned, or an exterior chimney that loses heat to the cold on three sides.

A standard brush skips over much of it. Removing it properly usually means rotary cleaning, where flexible rods spin whips or heads against the flue wall, and it takes longer and makes more mess in the firebox. It is still fully removable, but a flue at this stage is telling you something about how the fireplace is being run, and that is worth fixing at the same time or the layer simply comes back.

Stage three: glaze, and why it changes the conversation

Third-stage creosote is a hard, tar-like glaze that can run down the flue like melted and re-set candle wax. It is dense, it is concentrated fuel, and it burns hot when it ignites. It can also hide cracks in the flue tile behind it, so you cannot judge the liner’s condition until the glaze is gone.

Brushing does nothing to it. The options are chemical treatments that dry the glaze into a brittle state over several applications so it can then be swept out, specialized rotary heads, or, where the glaze is extensive or the tile underneath is damaged, a new liner. Which of those is right depends on what we find once we can see the surface, and that is why a sweep in this situation almost always goes together with a chimney inspection rather than replacing one.

How Bristol homeowners can check without climbing

You can get a rough read yourself on a cold, unused fireplace. Open the damper, shine a strong flashlight up past it, and scrape a small spot on the smoke chamber wall with a stiff tool. Powder that falls away is stage one. Crunchy flakes point to stage two. A surface that is shiny and will not scrape is stage three. Wear eye protection and do not climb onto the roof to look down the top.

We cover homes throughout unincorporated Bristol, on the north side of the Fox River across from Yorkville, and plenty of the fireplaces we see there get steady winter use, which is exactly when stage two starts building. If you would rather see what else is safe to check on your own, our chimney DIY guide walks through it, and every published rate is on our pricing page.

Find out which stage is in your flue

Ember Chimney Sweepers is run by Josh Amber and his brother Jack, both born and raised in Oswego, with 35 years of combined experience. We are insured and bonded, we work to NFPA 211, and we take calls seven days a week from 7am to 9pm. One look up your flue settles whether you need a brush, rotary tools, or a longer conversation.

Call (630) 451-4178

Written by Josh Amber, co-owner of Ember Chimney Sweepers, Oswego IL. Published October 10, 2026.

The crown is the sloped concrete slab covering the whole top of the brickwork; the cap is the metal lid with mesh sides that sits over the flue opening itself. They fail differently and cost differently: cap installation starts at $159, while crown repair starts at $319 and a full rebuild is quoted after inspection. If water is getting into your chimney, the crown is the more likely culprit, and it is the one nobody ever looks at.

Two parts, two jobs

Stand back and look at the top of a masonry chimney. The flue tile usually projects a few inches above everything else. Around it, covering the entire top surface of the brick, is a flat or gently sloped slab. That slab is the crown. Its job is to shed water off the top of the masonry and away from the brick, ideally with an overhang and a drip edge so runoff falls clear of the wall instead of down the face of it.

Sitting on top of the flue tile, or bolted to it, is the cap: a metal roof on legs with mesh screening between them. Its job is to keep rain, snow, leaves, birds and squirrels out of the flue opening, and to keep sparks from landing on your roof.

They protect different things. The cap protects the inside of the flue. The crown protects the masonry structure the flue runs through. A chimney with a perfect cap and a shattered crown is still soaking up water, and the damage from that is slower, more expensive and harder to see. Prefabricated chimneys, the ones inside a framed and sided chase, have a metal chase cover in place of a masonry crown, which is a different part with its own failure pattern.

How a crown fails, and why so many were built to

A properly built crown is a poured concrete slab, reinforced, several inches thick, sloped away from the flue, extending past the brick with a drip edge, and separated from the flue tile by a flexible expansion joint so the two can move independently.

What sits on top of most chimneys in the western suburbs is none of that. It is a thin layer of mortar troweled flat across the brick and up against the tile. Mortar is not concrete: it is not reinforced, it is not designed to be a horizontal weather surface, and it is nowhere near thick enough. It cracks, generally within the first ten to fifteen years.

Then the freeze-thaw cycle takes over. Water gets into the crack, freezes overnight, expands and widens the crack. Repeat that through an Illinois winter and a hairline turns into a gap you can put a screwdriver into. Water runs straight through it into the top course of brick.

The second common failure is the joint against the flue tile. Clay tile and masonry expand at different rates when heated. Without an expansion joint, the crown cracks in a ring right where it meets the tile, and every drop of rain that lands on that surface funnels directly down the outside of the liner into the chimney’s interior.

The third is the missing overhang. A crown poured flush with the brick face dumps its runoff straight down the wall, which saturates the brick and mortar joints continuously. That is what eventually produces spalling faces, crumbling joints, and the white mineral staining that shows up on so many chimneys around here.

We see all three regularly in Montgomery, where the mix of older housing near the river and mid-century builds along the Route 31 corridor means a lot of chimneys are now well past the point where a thin mortar wash was ever going to hold.

How to check yours without getting on the roof

Binoculars from the ground will tell you most of it. Look for visible cracks radiating across the top slab, a chunk missing from a corner, a gap where the slab meets the flue tile, or the slab sitting flush with the brick rather than projecting past it. Look at the brick immediately below the crown as well: if the top two or three courses look darker, chalky, flaking or streaked white while the brick lower down looks fine, water is coming in from above.

For the cap, check that there is one. A surprising number are simply missing, having rusted through or blown off in a storm without anyone noticing. If you can see one, look for rust, a crushed or dented lid, or mesh that is torn or packed with debris.

Inside the house, water damage from a failed crown shows up as damp or staining on the firebox walls, a musty smell, rust on the damper, or white deposits on the interior brick.

Small crown cracks can often be sealed with a flexible crown coating rather than rebuilt, which is the cheaper and entirely legitimate answer when the slab is structurally sound. When it has broken up, a rebuild, quoted after inspection, is the real fix, and doing it before the top courses of brick need tuckpointing, which starts at $399, is the difference between one job and two. Caps are covered on our caps and dampers page, broader masonry work on the repair page, and every published number is on pricing.

Have the top of your chimney looked at

Ember Chimney Sweepers is two brothers from Oswego with 35 years of combined experience, insured and bonded, taking calls seven days a week from 7am to 9pm. A crown inspection is part of every Level 1 we do, starting at $99, and finding a cracked crown in October is a considerably better outcome than finding a wet firebox in March.

Call (630) 451-4178

Written by Josh Amber, co-owner of Ember Chimney Sweepers, Oswego IL. Published October 9, 2026.

Put a carbon monoxide alarm within 15 feet of every sleeping room, which is what Illinois requires, and add one on each floor including the level with the fireplace. Mounting height barely matters because carbon monoxide mixes evenly with room air, so wall or ceiling both work. The part most people miss is the expiration date: CO sensors wear out on a fixed schedule, usually five to ten years, and an expired alarm can read zero while the room is not zero.

Where a fireplace actually produces carbon monoxide

Every fuel-burning fire makes carbon monoxide. A properly drafting chimney sends all of it outside, which is why a working fireplace is not a CO source and a failing one is. The failure modes are specific and worth knowing.

A blocked flue is the fastest route to trouble. A bird nest, a squirrel’s cache of leaves, or a heavy creosote layer narrowing the passage means exhaust that should be leaving instead backs into the room. This is most likely on the first fire of the season, after a full summer of the chimney sitting open.

Negative pressure is the quieter one. A powerful kitchen hood, a bathroom fan and a running clothes dryer can together pull enough air out of a tight house that the chimney reverses and becomes an intake. You get a slow trickle of exhaust into the room with no visible smoke to warn you.

Closing the damper too early is the classic. Coals that look dead are still producing carbon monoxide for hours. Shutting the damper on a bed of warm ash traps it in the firebox, and it comes out into the room.

Gas appliances deserve separate attention because they produce no smoke and no smell. A gas log set with a partially blocked vent, a cracked heat exchanger in a gas insert, or a burner running rich because the ports are clogged with lint and pet hair will all produce carbon monoxide silently. There is no sensory warning at all. That is the entire reason a gas fireplace service, starting at $159, includes a combustion and venting check rather than just cleaning the glass.

Placement, and the three mistakes we see in homes

The rule that matters is coverage by sleeping area. Carbon monoxide poisoning kills people while they are asleep, because the early symptoms read as ordinary tiredness. Illinois requires an alarm within 15 feet of every sleeping room, and that is the minimum, not the target. One per floor plus one outside each bedroom cluster is the arrangement we would want in our own houses.

Mistake one: treating it like a smoke alarm. Smoke rises, so smoke alarms go high. Carbon monoxide has almost the same density as air and distributes throughout the room, so the height debate is mostly noise. Follow whatever the manufacturer prints on the unit and stop worrying about it. Do keep them out of the immediate airflow of a vent or a window.

Mistake two: one alarm in the basement near the furnace. That covers the furnace and nothing else. It will not wake anyone on the second floor in time, and it will not see a fireplace backdrafting into the living room.

Mistake three: never checking the date. Every CO alarm has a manufacture date and an end-of-life date on the back. The electrochemical sensor degrades whether or not it has ever alarmed, and once it is past its rated life it is a plastic box with a working test button. The test button checks the horn and the battery, not the sensor. Pull yours down right now and read the date.

What to do when one sounds

Get everyone outside first, then call 911 from outside. Do not spend time hunting for the source, opening windows to air it out, or debating whether it might be a false alarm. If anyone has a headache, nausea, dizziness or confusion, tell the dispatcher, because those are exposure symptoms and they matter to the response.

After the fire department clears the house, the appliance that caused it still needs to be found and fixed. That is the point at which the chimney gets a real look. A Level 1 inspection, starting at $99, will identify a blockage or a draft failure, and if there is any chance the flue itself is compromised, the camera scan is the honest next step.

We run into this pattern regularly in Aurora, where a lot of homes on the near east and west sides have original masonry chimneys serving newer appliances they were never sized for. An oversized flue on a small modern unit cools the exhaust, hurts draft and raises the odds of spillage. It is a solvable problem, but only if somebody looks.

Get the chimney checked before heating season

Ember Chimney Sweepers is run by two brothers born and raised in Oswego, 35 years of combined experience, insured and bonded, seven days a week from 7am to 9pm. If your alarm has gone off, or you cannot remember the last time anyone inspected the flue, that is worth a call today rather than in January.

Call (630) 451-4178

Written by Josh Amber, co-owner of Ember Chimney Sweepers, Oswego IL. Published October 6, 2026.

A Level 2 inspection adds a camera scan of the inside of the flue plus a look at accessible attic, crawlspace and basement runs, which a Level 1 does not include. It starts at $199, against $99 for a Level 1, and you need it in four situations: you are buying or selling the home, you have had a chimney fire, you are changing the appliance or the fuel, or a Level 1 found something it could not see the full extent of. Outside those cases, an annual Level 1 is the right call.

What the camera actually shows that a flashlight cannot

A Level 1 inspection is a visual check of everything readily accessible: the firebox, the damper, the smoke chamber as far as you can see it, the exterior masonry, the crown, the cap and the flue from the top and bottom. It catches the majority of ordinary problems, and for a chimney in continued service with no changes, it is the correct annual inspection.

The limit is that a flue is a long dark shaft and you can only see so far into it from either end. A Level 2 sends a camera the full length. What that turns up, over and over, is cracked clay tiles at the joints, gaps where mortar between tiles has washed out, tile faces that have spalled and flaked, and liner sections that have shifted out of alignment. None of that is visible from the firebox. All of it matters, because a cracked liner lets heat and combustion gases reach the wood framing that the chimney passes by inside the wall.

The camera also settles arguments. When a homeowner is told they need an expensive reline, the correct response is to ask for the footage. We show it on the screen and explain what you are looking at, and if the liner is sound, you have documentation that it is sound.

The four times you actually need one

A home sale. This is the most common reason we run them in Yorkville. A general home inspector looks in the firebox and up the flue with a light and writes “recommend evaluation by a chimney professional,” which is the correct thing for them to write and tells the buyer nothing. A Level 2 converts that into a specific answer with images attached, before anyone negotiates a credit. Yorkville has a lot of turnover in the older housing near the river and a lot of newer stock north of Route 34, and both produce this line in the report.

After a chimney fire. Even a fire that went out on its own and seemed minor can crack tiles from thermal shock. The damage is inside the liner and it is invisible from the room. If you ever heard a roar, smelled a hot metallic burning, or saw sparks and debris coming off the top of the chimney, that flue needs a camera in it before the next fire.

Any change to the appliance or the fuel. Installing a wood stove insert, converting an open fireplace to gas, or swapping in a different-size unit changes what the flue has to handle. A flue sized for an open fireplace is usually far too large for a modern insert, which cools the exhaust and causes condensation and rapid buildup. This is worth resolving before installation, not after.

When a Level 1 finds a symptom without a cause. Water stains inside the firebox, an unexplained draft problem, a smell that will not clear, or heavy buildup that returns quickly all point somewhere the eye cannot follow. Upgrading is not upselling in those cases, and we say so plainly when it is not necessary.

What we do not do with the results

We do not quote a reline off a Level 1. Relining is the single most expensive thing a chimney can need, and quoting one without camera evidence is guesswork at best. That is why relining is the one service on our list without a published starting price: the specification depends on the flue size, the appliance and the actual condition of the existing liner, so we quote it only after an inspection.

Everything else, we publish. A sweep starts at $119, a cap starts at $159, crown repair starts at $319, tuckpointing starts at $399, and the rest is on the pricing page. If an inspection turns up work, you will see the same number we published, not a number invented on your driveway.

You can book either level on the inspection page. If you are unsure which one you need, describe the situation on the phone and we will tell you, including when the answer is the cheaper one.

Book the inspection that matches your situation

Ember Chimney Sweepers is run by two brothers from Oswego with 35 years of combined experience, insured and bonded, working seven days a week from 7am to 9pm. If you are under contract on a house and need a chimney answer this week, that schedule is usually the difference between making your inspection deadline and asking for an extension.

Call (630) 451-4178

Written by Josh Amber, co-owner of Ember Chimney Sweepers, Oswego IL. Published October 5, 2026.

Installing a gas insert into a masonry fireplace without addressing the flue creates a specific problem: gas combustion produces water vapour that condenses into a mildly acidic liquid inside an oversized old flue, attacking mortar and clay tile from within.

Why gas can damage a chimney with no soot

People reasonably assume that because gas burns clean, it cannot harm a chimney. The mechanism is different from wood, but it is real.

Burning natural gas produces carbon dioxide and a substantial amount of water vapour. In a correctly sized flue that vapour stays hot enough to exit as vapour. In an oversized masonry flue, originally built for a wood fire producing far more heat, the exhaust cools on the way up and the vapour condenses on the flue walls.

That condensate is mildly acidic. Over years it dissolves mortar joints between clay tiles and degrades the tiles themselves, and none of it is visible from the room.

Why Romeoville sees this often

Romeoville has a high rate of gas insert conversions, homes where a gas unit was installed into an original wood-burning masonry fireplace. Done properly, with a correctly sized stainless liner, that is an excellent upgrade: more efficient, more convenient, and easier to maintain.

Done without addressing the flue, it starts a slow degradation the homeowner has no way of observing. The insert works fine, the room is warm, and the chimney quietly deteriorates.

How to check where you stand

If your gas insert was installed as part of a conversion and you do not know whether a liner was fitted, that is worth resolving. A camera inspection shows the flue condition and whether a correctly sized liner is present.

The remedy where one is missing is a stainless liner sized to the appliance’s specification, which restores a correctly proportioned path so exhaust exits before condensing. It also improves the appliance’s draft and efficiency.

While we are there, annual gas fireplace service covers the appliance side: burner and pilot cleaning, log repositioning to manufacturer specification, millivolt testing on the thermopile, and gas leak testing at accessible connections.

Talk to a local chimney pro

If your pilot keeps going out, that is usually a weakening thermopile rather than the valve, and we measure before replacing anything. We cover Romeoville on our regular Will County route.

Call (630) 451-4178

Written by Josh Amber, co-owner of Ember Chimney Sweepers, Oswego IL. Published October 2, 2026.

Homes with basement or interior laundry rooms have long dryer duct runs with multiple bends, and lint accumulates fastest at exactly those bends. Those runs are the ones most likely to be genuinely blocked rather than merely dusty.

Why bends are the problem

Airflow slows at every change of direction. When air slows, the lint it is carrying drops out of suspension and settles. So every elbow in a duct run is an accumulation point, and a long basement-to-exterior run may have four or five of them.

Shorewood’s housing is predominantly modern with interior utility rooms, which is exactly the configuration that produces these runs. A short, straight run from a first-floor laundry to an exterior wall behaves completely differently from a basement run that travels twenty feet and turns four times.

The signs, in order of seriousness

Clothes needing more than one cycle, particularly towels and jeans, is the earliest and most common signal. A dryer or laundry room that is hot to the touch or noticeably humid after a load is the next stage. A burnt or musty smell during operation is more serious.

Little or no airflow at the exterior vent hood while the dryer runs is a strong indicator, as is a vent flap outside that stays shut or is visibly packed with lint. If the dryer trips its thermal cutoff and shuts down mid-cycle, the restriction is severe and the appliance is protecting itself.

Lint is highly combustible and a restricted duct makes the appliance run hotter than designed. That combination is why clothes dryers are a recognised cause of household fires, and it is genuinely preventable in about an hour.

What a proper cleaning involves

We disconnect the dryer and run a rotating brush on flexible rods through the entire duct from appliance to exterior termination, with a vacuum capturing debris as it is dislodged. Corners and elbows get specific attention.

We check the transition hose behind the dryer, because the crushed or kinked foil accordion hoses we frequently find are a major restriction in their own right, and we replace them with rigid or semi-rigid duct where appropriate. We also look for screws penetrating the duct interior, which act as lint hooks and will re-clog a freshly cleaned line within months.

Finally we measure airflow to verify the run is actually clear rather than just visibly cleaner. See dryer vent cleaning.

Talk to a local chimney pro

Dryer vent cleaning starts at $99 and takes about an hour. We cover Shorewood and the surrounding Will County area seven days a week.

Call (630) 451-4178

Written by Josh Amber, co-owner of Ember Chimney Sweepers, Oswego IL. Published September 29, 2026.

Many older Joliet homes have a single chimney stack carrying two or more separate flues, and frequently at least one is abandoned. An improperly capped abandoned flue can allow combustion gases to migrate between passages, which is a carbon monoxide risk that sweeping alone does not address.

Why one stack often has several flues

In older construction it was normal to run several flues up a single masonry stack: one for the fireplace, one for the furnace or boiler, sometimes one for a second fireplace or a long-removed appliance. Joliet’s substantial stock of pre-1940 homes and converted multi-family properties makes this common here.

Over decades, appliances get replaced, heating systems get converted, and flues fall out of use. What frequently does not happen is proper decommissioning. The flue is simply left, or capped in a way that was never intended to be permanent.

The actual hazard

Flues in a shared stack are separated only by their liners and the masonry between them. When liners deteriorate, which they do over sixty to a hundred years, gaps open between adjacent passages.

The result is that exhaust from an active appliance can cross into a disused flue and, from there, into the building. Carbon monoxide is colourless and odourless, and this failure mode produces no smoke and no smell in the room. It is genuinely one of the more dangerous things we find, and it is invisible without a camera.

Sweeping does not detect it, because sweeping cleans a flue rather than evaluating the masonry between flues.

How it gets diagnosed properly

Each flue in the stack has to be scanned individually. A Level 2 inspection runs a camera the full length of every passage, and we record the footage so you can see the condition yourself.

If we find breaches, the remedy is usually stainless relining of the active flue, which restores a continuous sealed path regardless of what the surrounding masonry is doing, plus proper permanent capping of any genuinely disused flue.

If you own a multi-family or converted property in Joliet, this is worth doing once even if nothing seems wrong. Written reports are suitable for landlord and association records.

Talk to a local chimney pro

We cover Joliet as the southern edge of our route, with no trip charge, seven days a week.

Call (630) 451-4178

Written by Josh Amber, co-owner of Ember Chimney Sweepers, Oswego IL. Published September 28, 2026.