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Soot Happens: Understanding Creosote and Its Risks

Home | Blog | Published on August 11th, 2025

We get it: chimneys aren’t exactly top-of-mind when life gets busy. But if you’ve been putting off that chimney inspection in Minneapolis, it’s time to take a closer look at something that quietly builds up over time: creosote. This sticky, tar-like substance might seem harmless, but it’s a serious risk lurking in your chimney flue.

Image of a chimney expert looking up a soot and creosote covered chimney.

What Is Creosote?

What exactly is creosote? Simply put, creosote forms when wood or fossil fuels are burned, and the smoke carries unburned particles that stick to the inner walls of your chimney. Over time, these particles accumulate, layer by layer, turning into a dense, highly flammable coating.

The Dangers of Creosote Buildup

Creosote buildup isn’t just “dirt” in your chimney—it’s a major fire hazard. According to the National Fire Protection Association (NFPA), creosote is one of the leading causes of chimney fires across the country. These fires can range from small flare-ups to devastating blazes that spread to your roof and home. And here’s the kicker: many of these fires are preventable with routine chimney maintenance.

The Three Stages of Creosote

There are three stages of creosote buildup.

  • Stage One is a flaky, dust-like layer that’s fairly easy to brush away during a standard cleaning.
  • Stage Two becomes more tar-like, harder, and more stubborn to remove.
  • Stage Three is a hardened, glassy glaze that requires specialized removal techniques.

The longer you wait, the more difficult, and costly, it becomes to clean.

More Than Just Fire Hazards

The risks don’t end with fire hazards. Creosote buildup can also block your chimney’s airflow, causing smoke and toxic gases like carbon monoxide to seep back into your home. Even a small amount of creosote can drastically reduce the efficiency of your fireplace, leading to poor heating performance. If you notice a strong smoky odor even when the fireplace isn’t in use, or if you see dark, oily spots inside the firebox, that’s a red flag that your chimney needs immediate attention.

How 2nd Generation Chimneys Can Help

That’s where we come in. At 2nd Generation Chimneys, we’re passionate about keeping your home safe and your chimney working efficiently. Our certified technicians provide thorough inspections and cleanings designed to tackle creosote buildup before it turns into a dangerous situation. We recommend having your chimney inspected at least once a year, especially before the heating season kicks off.

Don’t Skip Your Chimney’s Health Check-Up

Think of a chimney inspection as a health check-up for your home. You wouldn’t skip a doctor’s appointment, so why take a chance with something as serious as a chimney fire? Our team uses state-of-the-art equipment to spot even the smallest signs of creosote accumulation and structural damage. If cleaning is needed, we handle it with precision, ensuring your home stays safe and your fireplace stays cozy.

Schedule Your Inspection Today

Don’t let creosote catch you off guard. Schedule your inspection with us today and enjoy peace of mind knowing your chimney is in expert hands.

2nd Generation Chimneys, Inc. serves Minneapolis, St. Paul, and the Surrounding Communities.

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