The Dangers of an Undetected Chimney Fire

Most of us picture a chimney fire as something alarming and dramatic--flames shooting from the chimney onto the roof, thick smoke rolling, and fire trucks arriving outside the house.

But not all chimney fires are like that. Some burn so slowly and quietly that homeowners don't realize they're having one.

Even these less noticeable chimney fires can generate extremely high temperatures, potentially damaging the chimney system and creating a pathway for heat, smoke, or flames to spread to other areas of the home.

Keeping Your Home and Family Safe

Knowing what causes chimney fires, how to recognize one, how to prevent one, and what to do afterward can help protect your home and family.

What Causes a Chimney Fire?

Creosote buildup is a common cause of chimney fires. It forms when smoke and other combustion byproducts cool and collect along the inside walls of the flue. When enough creosote accumulates, high chimney temperatures can ignite it.

For this reason, the Chimney Safety Institute of America recommends scheduling an annual chimney inspection with a CSIA-Certified Chimney Sweep, like Admiralty Chimney.

To reduce creosote buildup, burn only dry, well-seasoned firewood and make sure your fire gets plenty of airflow so it burns efficiently. 

What Does an Active Chimney Fire Sound or Look Like?

The signs of an active chimney fire may include:

• Loud cracking or popping noises

• A roaring or rumbling sound

• Dense smoke

• An unusually intense hot or burning smell

• Flames or sparks coming from the top of the chimney

The Chimney Safety Institute of America notes that homeowners sometimes describe the sound as similar to a freight train or low-flying airplane. 

Don't assume the fire has safely gone out simply because the noise or flames stop. If you suspect an active chimney fire, get everyone out of your home and call 911.

The Chimney Fire You Didn't Know You Had

“We’ve had cases where a homeowner didn’t realize they had a chimney fire until we inspected their system,” explains John Butler, owner of Admiralty Chimney.

John points out that temperatures can still get high enough to crack flue tiles, damage mortar joints, warp metal components, or compromise the chimney's ability to safely contain combustion gases. 

“This is why an annual inspection is so important,” he adds.

What Should You Do After a Chimney Fire?

Even if the fire department has extinguished the fire and your home shows no visible damage, don't use your fireplace or wood stove again until a professional has evaluated the chimney. Extreme heat can damage areas of the chimney that aren't visible from either the fireplace opening or the roof.

Depending on the situation, a professional inspection may include an internal camera inspection to look for cracked flue tiles, failed mortar joints, separation, warping, or other heat-related damage. Don’t use your stove or fireplace until you complete any needed repairs.

How Can You Reduce Your Risk of a Chimney Fire?

Fortunately, chimney fires are preventable. One of the most important things you can do is schedule an annual chimney inspection and have it professionally cleaned as needed.

Also, be sure to follow basic precautions:

• Use a metal or glass screen.

• Only burn properly seasoned and stored firewood.

• Do not burn inappropriate materials.

• Avoid smoldering, poorly ventilated fires.

• Fully extinguish a fire before leaving home or going to bed

• Dispose of ashes properly in a covered metal container kept outside and away from the house.  

Fire Prevention Starts Before You Light the Match

Fireplace safety isn't only about what happens while a fire is burning. The condition of the chimney that carries smoke and heat out of your home is just as important.

If you're unsure when your chimney was last inspected, have noticed excessive creosote, experienced unusual noises or odors while burning, or believe you may have had a chimney fire in the past, schedule an inspection before continuing to use your fireplace or wood stove.

Chimney Inspections & Cleanings in Southern NH and Northern MA

At Admiralty Chimney, your safety is our business. Our experienced chimney professionals provide inspections, cleanings, repairs, and other chimney services for homeowners throughout Southern New Hampshire and Northern Massachusetts.

Before the burning season gets into full swing, contact Admiralty Chimney online or call (603) 594-0400 to ensure your chimney operates safely and efficiently.

8 Signs It’s Time for a Chimney Cleaning

There’s nothing quite like a cozy fire on a cool New Hampshire day. But before you light the first fire of the season, it’s worth taking a closer look at your chimney to ensure it’s working as it should.

Over time, soot, creosote, and other debris can collect inside your chimney, reducing venting performance and increasing the risk of a chimney fire. The tricky part is that much of this buildup happens where you can’t see it.

So, how do you know when it’s time to have your chimney cleaned?

Here Are Eight Signs to Watch For:

1. There’s Soot or Creosote Buildup in Your Fireplace or Flue.

One of the clearest signs that your chimney needs cleaning is soot or creosote buildup inside your fireplace or flue.

When wood burns, it produces smoke and combustion byproducts. As those materials travel up the chimney, some can condense along the flue walls and form creosote, a combustible residue that can range from flaky and powdery to hard, shiny, and glazed.

If you notice a significant layer of dark soot or creosote inside your fireplace or chimney, it’s time to have a chimney professional evaluate your system.

2. Your Fireplace Has a Strong Smoky or Musty Odor.

Does your fireplace give off a smell even when you’re not using it? A strong smoky, burnt, or musty smell coming from your chimney can indicate that creosote deposits have accumulated inside the flue.

Note: While an odor doesn’t automatically mean your chimney needs cleaning (moisture intrusion and other chimney problems can also cause odors), it’s a good reason to schedule an inspection.

>READ MORE:  What’s that smell? Fireplace odor causes and solutions

3. Smoke Is Coming Back Into Your Home.

A properly functioning chimney should create enough draft to move smoke and combustion gases up the flue and safely out of your home. If smoke begins spilling back into your living space, something may be interfering with that airflow.

Possible Causes Include:

• Heavy soot or creosote buildup

• Leaves, twigs, or other debris

• Bird or animal nests

• Damper problems

• Chimney design or draft issues

• Other obstructions within the flue

NOTE:  If smoke is entering your home, it’s important to determine the cause. A professional chimney inspection will tell you whether a cleaning will address your chimney’s performance issues or additional services are required.

4. You’re Finding Black Flakes or Debris in Your Fireplace.

If you notice black, crusty flakes collecting in your firebox, schedule a chimney inspection before continuing to use it.

Why? "These flakes may come from creosote that has loosened inside your chimney and fallen downward," says Admiralty Chimney Owner John Butler, a CCP-certified Master Chimney Technician. John notes that creosote deposits can take several forms, and some are harder to remove than others. Heavy or glazed deposits may require more intensive professional cleaning beyond routine sweeping.

5. Your Fire Isn’t Drafting Like It Used To.

Changes in how your fireplace burns can signal that something is going on inside your chimney.

Reduced Airflow

If you’re suddenly having trouble starting a fire, the fire seems sluggish, or smoke lingers in your home longer than usual, reduced airflow may be part of the problem. "Chimneys depend on unobstructed airflow to create proper draft. Buildup or blockages can interfere with that process," John points out.

However, draft problems can have several different causes. Schedule a professional chimney inspection to determine what’s actually going on.

6. You Hear or See Signs of Birds or Animals in Your Chimney.

Chimneys can offer attractive shelter for birds and small animals, especially if a chimney cap is damaged or missing.

Bird nests, leaves, twigs, and other nesting materials can partially or completely block a flue. Even if you haven’t used your fireplace recently, an obstruction may have developed since the last time the chimney was checked.

Listen for scratching, chirping, or movement inside your chimney, and watch for debris appearing in your firebox.

>READ MORE:  Keeping Critters Out of Your Chimney

REMINDER: Lighting a fire in an effort to remove a suspected nest or blockage can cause a chimney fire or smoke buildup in your home.  Schedule a chimney inspection instead.

7. You Can’t Remember the Last Time Your Chimney Was Inspected.

Sometimes the biggest warning sign is simply not knowing when your chimney was last inspected.

The Chimney Safety Institute of America (CSIA) recommends having an annual chimney inspection and notes that masonry fireplaces should generally be swept when there is about 1/8 inch of sooty buildup--or sooner if glazed creosote is present.

Even if you only use your fireplace occasionally, it should still be inspected annually. Why?  Because animals, moisture, deterioration, and debris can affect a chimney even when few fires have been burned, and a chimney inspection will tell you if it needs a professional cleaning and/or repairs.

8. You’ve Recently Purchased Your Home

If you’ve recently moved into a home with a fireplace or wood stove, it’s a good idea to have your chimney evaluated before assuming it’s ready to use.

Unless the previous homeowner provides reliable documentation, you may not know:

• How frequently the fireplace was used

• When the chimney was last cleaned

• If there has been a previous chimney fire

• If repairs are needed

• What condition the flue liner is in

John notes that a professional chimney inspection gives you a clearer picture of the system’s condition and whether cleaning or repairs are recommended before you begin using it.

How Often Should a Chimney Be Cleaned?

No single cleaning schedule applies to every chimney. How quickly deposits accumulate depends on the kind of fireplace or stove you have, how often it’s used, the type of wood being burned, the chimney system, and burning habits.

That’s why The Chimney Safety Institute of America (CSIA) recommends having an annual chimney inspection instead of relying on a fixed cleaning schedule. A professional can determine how much buildup is present and whether the chimney needs sweeping. 

>READ MORE:  Everything You Should Know About Chimney Inspections

Why Is Chimney Cleaning Important?

Chimney cleaning isn't just about tidiness. "Removing soot, creosote, and obstructions helps your chimney vent properly and can reduce the risk of a chimney fire," John says, noting that a professional inspection and cleaning can also uncover problems that aren't obvious from the fireplace opening.

Creosote is particularly important to address because it is combustible. That's why chimneys should be inspected annually and cleaned and repaired as needed to help prevent chimney fires.

Get Your Chimney Ready for the Burning Season

Once temperatures drop in New England, most fireplaces and wood stoves see heavy use. Getting your chimney checked before you use it will help ensure your system works safely and efficiently throughout the burning season.

If you notice soot or creosote, unusual odors, falling debris, smoke entering your home, poor draft, OR if you can't remember the last time your chimney was inspected, contact Admiralty Chimney to schedule a professional chimney inspection. 

Do you really need to waterproof your chimney?

When most homeowners think about chimney damage, a raging roof fire comes to mind. In reality, the greatest long-term threat to your chimney isn't fire; it's water.

Throughout the year, your chimney is exposed to water in many forms--from heavy spring rain to summer humidity to the repeating freeze-thaw cycles of winter. Over time, this moisture penetrates your chimney’s brick and mortar, causing masonry to crack, flake, weaken, and eventually fail. 

The bad news:  Left untreated, this damage can lead to costly repairs. 

The good news:  Waterproofing your chimney is a cost-effective way to prevent damage.

Why Water is so Damaging to Chimneys

Brick and mortar naturally absorb moisture. During colder months, that trapped water freezes and expands, creating pressure inside the masonry. As this process repeats year after year, it causes:

• Cracked bricks

• Deteriorating mortar joints

• Spalling (flaking or chipping masonry)

• Chimney crown damage

• Interior water leaks

• Mold and mildew growth

• Premature chimney deterioration

Because water damage develops over time, many homeowners don’t realize they have a masonry problem until significant and costly repairs are required. This is why scheduling a professional annual chimney inspection is so important.

Five Benefits of Professional Chimney Waterproofing

1. It Prevents Costly Water Damage.

A professional waterproofing treatment creates a breathable barrier that repels rain and snow before moisture can penetrate your chimney's masonry. Preventing water intrusion today can save thousands of dollars in future masonry repairs.

2. It Prevents Mold and Mildew Growth.

When water enters a damaged chimney, it can migrate into your home’s walls, ceilings, and framing. This excess moisture creates ideal conditions for mold and mildew growth, potentially affecting both your home and your indoor air quality.

3. It Extends the Life of Your Chimney.

Your chimney is built to last for decades-- but only if it's properly maintained. Waterproofing protects masonry from the constant cycle of moisture absorption and freeze-thaw damage, helping preserve the structural integrity of your chimney for years to come.

4. It Improves Energy Efficiency.

Damaged masonry allows heat to escape more easily while permitting unwanted moisture into your home. Keeping your chimney dry helps maintain its performance and contributes to a more energy-efficient home, particularly during the heating season.

5. It Preserves Your Home's Appearance.

A chimney is one of the most visible architectural features of your home. Cracked mortar, stained brick, and deteriorating masonry can negatively impact curb appeal. Waterproofing helps keep your chimney looking clean, well-maintained, and structurally sound.

Before Waterproofing Your Chimney…

Applying a waterproof coating over damaged masonry doesn't solve the underlying problem; it simply hides it. Before waterproofing your chimney, schedule a professional chimney inspection to identify and address any masonry damage, deteriorated mortar joints, cracked crowns, or other issues.

Can You Waterproof Your Chimney Yourself?

You could, but we don’t recommend it.  

Professional chimney waterproofing uses a specially formulated, vapor-permeable sealant that repels liquid water while allowing the masonry to release water vapor naturally. This is important because chimney masonry needs to "breathe." Products that trap moisture inside the brick can actually accelerate deterioration.

A professional waterproofing application also ensures your entire chimney is treated safely and evenly without exposing you to the hazards of working on a roof.

Is Chimney Waterproofing Worth The Investment?

Compared with rebuilding damaged masonry, replacing bricks, repairing crowns, or correcting water intrusion inside your home, chimney waterproofing is a relatively small investment that can significantly reduce future repair costs.

In New England, where chimneys are exposed to harsh winters and frequent freeze-thaw cycles, waterproofing is one of the most effective preventative maintenance services available.

Chimney Services in Southern New Hampshire & Northern Massachusetts

Admiralty Chimney provides professional chimney waterproofing, inspections, cleanings, and repairs throughout Southern New Hampshire and Northern Massachusetts. To connect with our CCP-certified team, call us at (603) 594-0400 or visit us online.