Mortar is a mixture of sand and cement that binds materials, such as bricks, stones, and concrete blocks, together. Think of it as the glue that fills in the gaps between bricks and stones, then seals them in place to prevent damage or deterioration. Mortar also helps spread the load across a wall or structure, keeping cracks and shifting at bay.

The premise for painting a brick building is fairly simple: Prime the bricks to seal the surface and apply the top coat to protect your brick home. However, it’s easy to miss a few important steps if you’re starting from a raw brick surface and don’t know the basics of how to paint brick. So be sure to reach out to a local professional painter if you have any reservations about correctly painting your brick house.

According to the Earthquake Country Alliance—a public and private alliance in California that works to improve earthquake and tsunami readiness—reports that unreinforced masonry, such as stone, bricks, and hollow clay tiles, is more susceptible to earthquake damage. The mortar between bricks isn’t as stable as other building materials and methods.

Brick can increase the value of your home depending on the type of masonry materials used. Homes generally have a higher resale value when they have brick siding, and brick is also easier to maintain (and lasts longer) than other types of siding, which can motivate buyers to make an offer.

Just keep in mind, however, that although brick can up the asking price when you sell your house, the cost to brick a house is also more expensive than other typical siding costs—so you’ll invest more in the project.