What is creosote?

Creosote is a by product of burning wood or fossil fuels in a fireplace or wood stove. As smoke rises through the chimney, it cools and condenses, leaving behind a residue of unburned particles. Over time, these particles form creosote, which appears as a black or brown build up on the inner walls of your chimney.

Why does creosote build up? 

Several factors contribute to the formation and accumulation of creosote:

1. Incomplete combustion: Burning unseasoned or wet wood produces more smoke and less heat, leading to greater creosote deposits.
2. Cool chimney temperatures: If your chimney isn’t at the correct temperature, the cooler surfaces encourage condensation and creosote build up.
3. Restricted airflow: Poor ventilation, such as a blocked flue, reduces the oxygen needed for a complete burn, resulting in more creosote.

Why is creosote dangerous?

Creosote isn’t just unsightly; it’s a serious safety risk:

1. Highly flammable: Creosote is a leading cause of chimney fires. Even a small amount can ignite and cause flames to spread through the chimney, potentially damaging your home or worse.
2. Reduced efficiency: A creosote-clogged chimney can restrict airflow, making it harder for smoke and harmful gases, like carbon monoxide, to escape.
3. Structural damage: Over time, creosote can corrode the chimney lining, leading to costly repairs.

How to prevent creosote build up

The good news is that creosote build up is preventable with regular maintenance and good fireplace habits:

1. Burn seasoned wood: Always use dry, seasoned wood that burns hotter and cleaner. Avoid burning rubbish, cardboard, or other non-wood materials.
2. Ensure proper ventilation: Make sure your chimney is clear of blockages, and keep the air vents open in the correct position while the fire is burning.
3. Schedule regular chimney inspections: HETAS recommend having your chimney inspected and cleaned at least once a year by a HETAS approved professional, like Swept. Chimney Sweeping Services.

When did you last have your chimney swept?

If you notice any of the following, it’s time to call Swept Chimney Sweeping Services:

• Unusual odours coming from the fireplace.
• Thick, sticky black deposits on the chimney walls, inside the firebox and on the glass.
• Smoke that fills the room when the fireplace is in use.

Stay Safe and Cosy

A crackling fire adds warmth and ambiance to your home, but it’s essential to keep safety in mind. By understanding what creosote is and how to manage it, you can enjoy your fireplace worry-free.

Take the first step to a safer home—schedule your chimney sweeping appointment today!

Contact Swept. Chimney Sweeping Services with any queries.

Written by Gary Walker 
Gary, owner of Swept. Chimney Sweeping Services in Huddersfield, is a HETAS trained and approved chimney sweep, co-founder of GD Logs (www.gdlogs.co.uk), and an award-winning direct marketing expert. Raised on a small holding with a passion for wood burners since the 80s, Gary is City & Guilds NPTC qualified in Chainsaws and Tree Felling. He advocates for sustainable heating fuels and possesses a passion for wood burning stoves. 

Next blog: Top tips for keeping your stove glass sparkling clean