Masonry foundations can be made using concrete block or brick masonry units. The concrete block masonry foundation is often utilized since it is inexpensive and its unappealing aspect is hidden. However, the concrete block masonry foundation cannot be altered once it has been built. The concrete brick masonry foundation allows the owner to make changes to its appearance by adding new brick or stone veneer panels. This is useful if the owner wants to change the look of his or her home without having to completely rebuild part of the foundation. Brick is the most popular material used for masonry because it looks good and functions well as a foundation wall. Brick needs to be allowed to breathe so that it does not become too warm or cold during different seasons. This is why brick should not be placed directly under a house addition or underground garage unless air flow is provided through the use of perforated materials such as rock or glass. If air cannot reach the brick, it will be trapped when water flows into the basement through an opening such as a floor or wall cavity. Concrete block is strong, durable, and attractive. It provides adequate support for light loads and is easy to maintain. Concrete block is also the least expensive type of masonry available and it can be used in place of other types of masonry including fired clay tile and stucco.