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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.

Spalling brick is not uncommon, but it does indicate a serious issue. It can be caused by water damage, an intense freeze-thaw cycle, or something else. Painted bricks can be susceptible to spalling, as the paint doesn’t allow the porous material of the brick to breathe, which can trap moisture. Spalling should always be addressed immediately before more serious structural damage occurs.

For most brick cleaning jobs, including fireplace bricks, use a masonry sponge and a gentle cleaner. A simple solution of equal parts water and vinegar, or a few drops of dish soap in a bowl of water, can effectively remove grime. For tougher stains, you can use a dedicated masonry or fireplace cleaner. It is crucial to wet the bricks thoroughly with water before applying any cleaning solution to prevent the brick from absorbing it, and to rinse the surface completely afterward. Harsher cleaners containing bleach or ammonia should only be used as a last resort, and they should never be mixed together.

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.