Masonry is anything that is made out of things like concrete, bricks, stones, or clay. Generally, the definition also includes the end product being constructed with mortar to hold all the stones, clay, etc. together. But there are some things, especially walls, that are put together without mortar that could still be considered as masonry. If you have a masonry wall, chimney, or patio, it is going to be exposed to the weather, which means that you'll run into some common problems that will need to be repaired.