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A traditional rectangular brick that is used for siding, brick walks, and pathways is 8 inches long by 4 inches wide. If you are shopping for fire bricks, the standard dimension is typically 9 inches long by 4.5 inches wide.

Painted exterior brick does not usually need sealing. Brick is a porous material, so you don’t want to apply a sealant that could trap moisture inside the bricks and cause erosion and structural damage. The risk of moisture-induced damage after sealing is higher in colder climates where trapped moisture can expand if it freezes. On the other hand, it makes sense to seal really old brick or kitchen backsplashes, where moisture from cooking can weaken the brick.

Depending on the amount of soot present, you can vacuum some of it using a brush attachment on your vacuum cleaner. Then, remove the leftovers with a mild cleaner, such as dish soap or vinegar mixed with water. Before applying a cleaning solution, saturate the bricks with clean water to prevent the cleaner from penetrating beyond the surface and causing structural damage to the bricks.

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.