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You will repoint over a fraction of the old mortar, but you should scrape away 1/2 to 1 inch of mortar from the joints before repointing. Otherwise, the repointing is only masking the weakened mortar instead of actually replacing it, which could put your chimney at risk of bigger, more expensive damages later on.

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.

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.

Masonry is an umbrella term that involves adhering individual building materials together using an adhesive, so many different things are considered masonry. These include constructing stone or brick walls or facades, installing stucco siding, installing backsplashes or tile floors, and even installing glass block windows, in some cases. Masonry materials include natural stone, clay bricks, concrete bricks, glass blocks, and tiles.