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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.

Fireclay is a type of clay but it is a type of clay that, because of its chemical composition, can be fired at a much higher temperature than other clays. This results in a denser and more heat-resistant final material. Because of the high percentage of a mineral called kaolin, fireclay sinks are smoother and more durable than other clay types.

Yes, technically, you can pressure wash the paint off of brick. However, you run a much greater risk of damaging the brick and causing serious problems. If you go this route, you’ll still need to carefully choose and apply a chemical paint stripper before washing, following all instructions on the product packaging. Set your power washer to a low pressure to avoid damage.

In some cases, black stains on brick are caused by organic substances like algae and mold. However, it's more likely that the black spots you're noticing on your bricks come from carbon from vehicle exhaust or soot. Black stains can usually be removed by scrubbing the brick with a brush and masonry cleaner or power washing.