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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.

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.

Yes, you can limewash surfaces other than brick. Plaster, stone, stucco, and concrete can all also be limewashed. Any porous surface that will absorb the wash is a good candidate for limewash, although it won’t help much with waterproofing. If you choose to limewash over paint, you’ll need to prep before applying it to avoid a powdery, chalky finish. Shiny surfaces like metal or glass can’t absorb limewash, so it’s not suited for these.

In most cases, painting your brick house is a fine idea that can open up new aesthetic possibilities. However, the paint can slightly shorten the life span of brick, especially if moisture gets trapped underneath the paint layer. Once you paint, you’ll have to keep up with maintenance to avoid flaking and blisters.