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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.

Beyond having an inspection, it’s important to do chimney maintenance at least annually to be certain the chimney is safe to use. Cleaning the flue of any built-up particles, creosote, and soot reduces the risk of fire. Fortunately, the cost of hiring a pro to do a chimney inspection often includes a chimney cleaning, so you may not have an extra expense for maintenance.

The answer can vary widely based on a home's age and design. As with any type of remodeling project, assume that every structure is load-bearing until confirming otherwise with a structural engineer. Almost all modern homes have chimneys that are fully independent from the rest of the home's framing. As a result, they don't bear any load beyond their own weight. However, many historic homes built prior to the 1900s contain load-bearing chimneys that tie into the surrounding roof and floor joists. If possible, use a home's blueprints or look for chimney connections that indicate load-bearing qualities to get your answer.

Avoid using abrasive cleansing powders on natural stone, as these products could damage the porous material. Using bleach is also a poor idea because of the porosity of the stone. Avoid using a scrub brush with metal bristles, as they could scratch the stone. If you know who manufactured your stone or who installed the fireplace, you may want to contact that entity for any advice on cleaning it safely.