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While painting can certainly change the look of a chimney, you should think twice about giving your brick chimney the old landlord special.

Painting brick is porous, meaning it’s full of tiny holes that can soak up moisture. Those holes also allow it to dry, though. So, when you paint it, you trap any moisture inside, providing an opportunity for mold, mildew, and water damage.

Paint also shows wear faster than naked brick. This means that once you paint a brick surface, you’ll have to keep painting it to maintain a clean look. A paint job is also harder to undo on brick because of its porous nature. Once you paint it, it’s hard to go back without some serious power washing—another added cost.

Exterior brick stain can last between 10 and 20 years, on average. A number of factors can impact the longevity of the stain though, including your location and climate. Other factors like the condition of your brick, the quality of stain you choose, and the overall stain type can also alter how long your bricks look new.

Chimney mortar typically lasts 20 to 30 years, depending on its quality, local weather conditions, and maintenance. Over time, exposure to moisture, freezing, and thawing cycles can cause mortar to deteriorate, leading to cracks and gaps. Regular inspections and timely repairs, such as repointing or tuckpointing, can extend the lifespan of chimney mortar by ensuring the structure's integrity.

In certain cases, such as when dealing with surfaces like concrete rather than brick, grout can be used instead of mortar. Grout tends to be more convenient to work with on non-masonry surfaces. However, many experts suggest using mortar whenever possible, as it provides stronger adherence to the bricks and results in a more textured appearance.