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Yes, you can paint stone on the exterior of a house. It’s important to properly prep the stone by cleaning off dirt and debris. You’ll want to apply at least two coats of paint to get the most even and complete coverage. Any pinholes or missed spots, however small, can allow moisture to get into the masonry and potentially cause the paint to blister and peel from the stone.

Mortar, or masonry mortar, is mainly used in joints and as parging for stone, brick, or cement construction. Stucco is primarily a surface material used as wall coverings. For maintenance, masonry will need repointing or replacing as damage or land shifting occurs, whereas stucco will need patching or refinishing as it tends to crack over time along with other types of wear-and-tear.

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.

Brick spalling—which refers to the crumbly, flaky, or pitted appearance that can develop over time—is caused by a few different conditions. These include:

• Climates with constant freeze-thaw cycles

• Use of non-breathable sealants

• High-pressure water cleaning

• Improper installation

While you can’t do anything about the weather, you can preserve your bricks by cleaning them with soapy water and a good old-fashioned scrubbing. Pressure washers may be satisfying to use, but they can eventually wear away the surface of your bricks. If you don’t have advanced-level DIY skills in masonry, you can hire a reputable masonry contractor in your area for your project.