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Yes, it is normal to see some minor hairline cracks in brick or mortar over time, often due to natural foundation settling. However, not all cracks are harmless. You should be concerned and contact a masonry professional for an inspection if you notice cracks that are getting wider or longer, or if new ones keep appearing. Other serious warning signs that can indicate significant structural or foundation damage include large vertical cracks (especially those that widen as they go up), stair-step cracks, L-shaped cracks, and deep horizontal cracks. Factors like temperature changes, moisture, and structural loading can also cause cracks to form or worsen.

It’s called cobblestone because it’s made of stones that are “cobbed” together. A cob is a term that refers to rounded lumps. Originally, cobblestone streets were made from pebbles and stones gathered from riverbeds that had been rounded over time by the passage of water. The term has nothing to do with a cobbler, which is the term for someone who makes and fixes shoes.

Cobblestone is not a type of rock but a term for a mosaic or rock laid down as a surface. It used to be made from the closest available stone but now can be made from nearly any hard rock, as machining has made shaping the stone much easier and cheaper.

A mason lays brick or stone together, sometimes with mortar in between the bricks and stones, and sometimes without mortar, also called a dry-stack or surface bonding. Examples of work masons do include:

• Brick, stone, or cement block houses and buildings

• Freestanding stone or brick walls

• Chimneys with wood-burning fireplaces

• Cement block basement or crawl space walls