Purpose And Function Of A Chimney Cap

A chimney without a cap is like walking around Market Square in the rain without an umbrella or rain hat—you get soaked! Just like getting wet can make people sick, water can also harm the chimney. A chimney without a cap or cover can lead to various problems, from water damage and unwelcome pests to dangerous blockages and heat loss. Chimney caps, flue caps, and other protective covers are the first line of defense to protect your chimney and venting system and your home.

Chimney Cap

A chimney cap is a protective device installed at the top of the structure covering the flue opening. Its primary purpose and function is to prevent the intrusion of external elements into the chimney flue. Rain, snow, and sleet can cause significant damage to the chimney’s interior and exterior masonry, leading to costly repairs and potentially compromising the stack’s structural integrity. A well-fitted chimney cap effectively diverts this precipitation, keeping the flue dry and free of pests and debris while expelling toxic combustion gases.

Custom Full-Width Chimney Cap

Custom full-width chimney caps, designed to cover the entire top of the chimney, not only protect against water damage but also complement your home’s style. Their easy installation and potential for significant long-term savings make them a smart investment for any homeowner.

Flue Cap

While often used interchangeably with “chimney cap,” a flue cap refers to a cap that covers only the opening of a single flue. Individual flue caps are installed to cover each opening of a single-flue chimney. For chimneys that service multiple flues (connecting a fireplace and perhaps a furnace or water heater), a flue cap is required to cover each opening. The flue cap functions similarly to a chimney cap, preventing water, debris, and animals from entering that specific flue.

Other Types of Caps for the Chimney

In addition to the chimney and flue caps, other types of covers protect chimneys, such as:

Chimney Chase Cover

This type of cover is for installation on manufactured or metal chimneys enclosed in a wood chase. The chase cover seals the top of this chase, much like a lid on a shoebox. Typically made of metal (such as galvanized steel, stainless steel, or copper), the chase cover prevents water from entering the chase and damaging the chimney components and the surrounding structure. It has a collar or opening through which the flue pipe extends, with a chimney cap. A damaged or improperly fitted chase cover can lead to significant water damage within the chase and potentially into the home.

Top-Sealing Damper

A top-sealing damper is installed at the top of the chimney flue, typically replacing a damaged throat damper. Operated by a cable that extends down to the firebox, a top-sealing damper effectively seals off the entire flue when the fireplace or appliance is not in use. This tight seal prevents heated or cooled air from escaping your home through the chimney, improving energy efficiency and reducing drafts. A top-sealing damper also serves as a chimney cap to keep out rain, debris, and critters.

Professional Installation and Maintenance

Choosing the right type of cap or cover for your chimney top and ensuring its proper installation is crucial for it to function effectively. A damaged or incorrectly installed cap is ineffective and can even create new problems. Also, creosote buildup on a cap’s mesh can impede the draft, and accumulated debris can block the flue entirely. So, annual inspections and cleaning of your chimney and its cap are also vital to ensure they remain secure and free of obstructions.

Where to Buy Chimney Caps in Greater Pittsburgh

Advance Chimney Sweeps is Greater Pittsburgh’s most trusted chimney company, specializing in chimney repairs, rebuilding, and restorations. Our certified professionals can assess your chimney’s needs and recommend and install the appropriate cap or cover for your masonry or manufactured chimney. We serve communities throughout southwestern Pennsylvania, including Allison Park, East Butler, New Kensington, and Wellersburg. Visit our website to schedule an appointment today! Ask about our convenient financing options.