How Your Chimney Works

chimney-repair-cost

Every homeowner should understand the scientific basics of how your chimney works. Reduce chimney repair cost by maintaining your chimney over time. Learn how to diagnose problems with your chimney that may require professional repair. Save money with a more efficient chimney.

Your House Works Together as a Complete System

Your home has constant airflow. Wind loading, stack effect, furnaces, and fireplaces all contribute to changes in the home’s overall airflow. Modern homes from the last two decades have much tighter airflow. Older homes often suffer from drafts and inefficiency overall. Your chimney repair cost will be affected by numerous factors including the age of your home, the structural integrity of your chimney, and the overall airflow in your home.

The stack effect refers to warm air rising to the upper levels of your home. The air attempts to escape your home from the upper levels. Meanwhile, new air pushes its way inside your home on the lower levels. The Natural Pressure Plane (NPP) is the point where the indoor-to-outdoor air pressure is essentially zero. Each home has at least one NPP, and possibly more. Factors like a home with two chimneys can result in smoke in the home because of changes in the air flow.

Wind-loading occurs when wind causes additional air pressure by striking the home. Open windows and doors will help pressurize the house. Backdrafting may result if windows are open on the leeward (downwind) side of the home. Other devices like kitchen fans, bathroom fans, and central vacuums will affect depressurization, as well. Furnaces, fireplaces, woodstoves, and water heaters require large volumes of air. Innovative mechanical devices will help manage air flow.

Your chimney is considered a negative pressure system. In other words, your chimney pulls air through a firebox, creating a draft. Poor chimney flow can result in your home being full of smoke, structural damage, or dangerous creosote build-up. There are a number of reasons why your chimney does not function properly:

  • Creosote deposits
  • Plugged and closed dampers
  • Structural damage
  • Improper construction
  • Dirty or damaged chimney cap

Think of a dirty chimney cap like a water hose plugged at the end. The water builds up. In the same way, a damaged chimney will prevent airflow through the chimney and out of your home. A professional inspection will help determine if your chimney is functioning correctly.

Regular maintenance and cleaning help maintain your chimney and fireplace. Call the experts at Cummins Restoration about your chimney repair needs today. Our friendly staff will be happy to answer all of your questions. Please set up your consultation now.