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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.

Most of the time, you don’t need to seal brickwork and can save that money for another area of home improvement. But if your brick is cracking or you live in an area with a lot of excess moisture (either in terms of rain or freezes), sealing can extend the lifetime of your home. But, make sure you use a breathable sealant, like siloxane, to allow the moisture to evaporate on its own.

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.

Drilling into brick or mortar requires the use of a masonry drill bit. Masonry drill bits appear similar to standard drill bits except for the leading tip of the bit. The tip has a bulky carbide arrow-shaped end slightly larger than the rest of the bit shaft. Standard or high-speed drill bits designed for making holes in wood or metal don’t have the ruggedness or design shape you need to drill into brick. They may not go through the brick at all, and if they do, they’re more likely to overheat, crack, or dull before you finish drilling.