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You should use cement for a chimney crown. The purpose of the chimney crown is to protect the mortar below from water damage and the effects of weather. For this reason, chimney crowns should only be made using cement. When repairing a crown, use caulks and sealants designed for cement repair rather than mortar repair.

To stain brick, you should use a product specifically formulated for brick, concrete, or other masonry surfaces. These stains are designed to penetrate the porous surface of the brick and bond with it. This is different from paint, which sits on the surface and is prone to peeling, flaking, and trapping moisture that can cause damage. Water-based brick stains are often recommended because they are easy to apply, even for DIYers, and they allow the brick to breathe. Avoid using regular paint on brick, as it will not adhere properly and can lead to future maintenance problems.

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.

Yes. Black stains are more than an eyesore. Some black stains can pose health concerns, especially for those with asthma, allergies, or other respiratory conditions. Some stains can also damage the brick’s structural integrity, harming the mortar and resulting in more expensive repairs.