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The National Fire Protection Association (NFPA) says that chimneys and their associated elements like fireplaces, vents, or stoves should be cleaned at least once a year before the start of seasonal use. According to the Chimney Safety Institute of America, a chimney should be cleaned when there is 1/8 inch of soot buildup. If there’s more than that, creosote—a flammable byproduct of burning wood—can form and increase the risk of a chimney fire.

In addition to flashing, a roof cricket can help divert water around your chimney so that it drains properly off your roof. It’s shaped like a double triangle and is installed behind the chimney so that falling water spills evenly down each side. This helps prevent water from accumulating behind your chimney, which can increase water damage and the risk of leaks. 

The International Building Code (IBC) requires cricket installation if a chimney built after 2012 measures over 30 inches in width. Chimneys constructed before that date are typically grandfathered in and aren’t required to have crickets installed.

A fireplace that doesn’t require a chimney is simply called a chimneyless fireplace. Don’t confuse these with ventless fireplaces, however. There are some fireplaces that require ventilation via a system of pipes, not a chimney. More specifically, the fireplace in question will likely be called by its name, such as electric, ethanol, or balanced flue.

A well-constructed and regularly maintained brick chimney can last 50 to 100 years, potentially spanning multiple generations of homeowners. The exact lifespan depends on the quality of construction, materials, local environment, and maintenance. In contrast, a metal chimney typically lasts 15 to 20 years. While the main structure is durable, individual components have shorter lifespans and require more frequent replacement. For example, mortar may need repointing every 20 to 30 years, chimney crowns last 50 to 75 years, and liners can last anywhere from 15 to 50 years depending on the material (e.g., stainless steel vs. cast-in-place).