chimney FAQ

How Can I Fix The Backdraft In My Chimney?

Short Answer: Fixing chimney backdraft involves identifying its root cause, such as insufficient air supply or obstructions. Increase air supply by opening windows or installing a makeup air system. Balance indoor air pressure, address chimney design issues, and remove obstructions with regular cleaning.

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Chimney backdraft is a common issue experienced by many homeowners, which can cause smoke and hazardous fumes to enter the home instead of being properly vented outside. Addressing this problem is essential for maintaining a healthy indoor environment and preventing potential fire hazards.

Lindemann has over 50 years identifying and repairing chimney issues such as the problems that result in chimney backdraft. We will discuss the causes of chimney backdraft, how to identify its root cause, effective ways to fix it, and preventative measures to keep your chimney functioning efficiently.

Understanding Chimney Backdraft

The first step in fixing any backdraft in your chimney is to have a good understanding of the overall problem. This includes some of the common causes of chimney backdraft, as well as the potential dangers. Let’s take a look at some of the causes and dangers.

Causes of backdraft

There are several factors that contribute to chimney backdraft:

  • Insufficient air supply: A lack of oxygen in the room with the fireplace can cause smoke and fumes to be drawn back into the living space.
  • Negative pressure in the house: Appliances like exhaust fans, clothes dryers, and HVAC systems can create negative pressure, pulling air down the chimney and causing backdraft.
  • Improper chimney design or construction: A poorly designed or constructed chimney may not efficiently draw smoke and fumes out of the house.
  • Chimney obstructions: Debris, creosote buildup, or animal nests can block the chimney and disrupt the proper airflow.

Dangers of backdraft

Chimney backdraft poses several risks:

  • Health risks from smoke inhalation: Exposure to smoke and fumes can cause respiratory issues and other health problems.
  • Potential fire hazards: Backdraft increases the risk of fires from hot embers and sparks escaping the fireplace.
  • Damage to property: Soot and smoke can cause staining and damage to your home’s interior.

Identifying the Root Cause of Backdraft

Now that you understand the basics of chimney backdraft such as the common causes and safety concerns, it’s time to determine the cause of your chimney’s backdraft. To do this, you can either do it yourself with a DIY inspection or consult a professional such as Lindemann to determine the root cause of the backdraft.

Professional chimney inspection

Hiring a professional chimney inspector is the most reliable way to determine the cause of your backdraft issue. Professionals have the knowledge, experience, and tools to identify any problems and recommend appropriate solutions.

DIY inspection

If you prefer to inspect your chimney yourself, take the following steps:

  • Safety precautions: Wear protective gear and ensure the fireplace is cool before starting the inspection.
  • Signs of obstruction or damage: Look for visible signs of blockages, such as debris or creosote buildup, and any structural damage to the chimney.
  • Chimney sizing: Check if your chimney is properly sized for your fireplace. An improperly sized chimney can cause backdraft issues.

Fixing the Backdraft Issue

Once the cause of the chimney backdraft has been identified, it’s time to fix the issue. There are a few common solutions that will solve these problems, including increasing the air supply to the chimney, balancing indoor air pressure, fixing any construction and chimney design issues, or removing any obstructions.

Increasing air supply

  • Open windows and doors: Providing additional airflow by opening windows and doors can help alleviate backdraft.
  • Install a makeup air system: This system introduces fresh air into the home, ensuring adequate oxygen for proper combustion and venting.

Balancing indoor air pressure

  • Seal air leaks: Locate and seal any air leaks in your home to prevent negative pressure.
  • Adjust HVAC systems: Properly balancing your HVAC system can help equalize indoor air pressure.
  • Use exhaust fans strategically: Avoid using exhaust fans simultaneously with your fireplace to minimize negative pressure.

Addressing chimney design or construction problems

  • Rebuild or reline the chimney: If your chimney is damaged or poorly constructed, you may need to rebuild or reline it to improve its performance.
  • Extend the chimney height: A taller chimney can create a stronger draft, reducing the likelihood of backdraft.
  • Install a chimney cap: A properly installed chimney cap can prevent downdrafts and protect your chimney from debris and wildlife.

Removing obstructions

  • Regular chimney cleaning: Annual chimney cleanings by a professional can help prevent creosote buildup and other obstructions.
  • Install a protective screen: A screen can prevent debris and animals from entering the chimney and causing blockages.
  • Inspect for wildlife nests or debris: Regularly check your chimney for any signs of animal nests or debris, and remove them promptly.

Preventing Future Backdraft Issues

If you’ve fixed the root cause of your chimney backdraft then you’re in good shape. However, the problem could potentially return in the future if you don’t take proper precautions. Here are a few things you can do to prevent future backdraft issues with your chimney.

Regular chimney maintenance

  • Importance of annual inspections: Schedule professional chimney inspections at least once a year to ensure your chimney is in good condition and functioning properly.
  • Cleaning schedule: Stick to a regular cleaning schedule to prevent the buildup of creosote and other potential obstructions.

Proper fireplace use

  • Burning appropriate materials: Use only seasoned hardwoods, and avoid burning wet wood, trash, or other materials that produce excessive smoke or creosote.
  • Avoid overloading the fireplace: Do not overload your fireplace with wood, as this can cause incomplete combustion and increase the likelihood of backdraft.

Monitoring indoor air quality

  • Use air quality monitors: Install air quality monitors in your home to keep track of any changes in indoor air quality, and take appropriate action if needed.
  • Address sources of indoor pollution: Identify and address any sources of indoor pollution, such as pet dander, dust, or mold, to maintain a healthy indoor environment.


Chimney backdraft can pose serious health risks and damage to your property, making it crucial to address any issues promptly. By understanding the causes of backdraft, identifying the root cause, and implementing appropriate solutions, you can ensure your chimney operates efficiently and safely. Remember to schedule regular chimney inspections and maintenance, and consult with professionals if needed, to keep your fireplace and chimney in top condition.