Final answer:
When only masonry block is used in a foundation wall, stucco is commonly applied to the front instead of brick veneer. Stucco, a durable and weather-resistant finish, has been traditionally used in Roman construction and is a preferred choice for enhancing the aesthetic of masonry walls.
Step-by-step explanation:
If only masonry block is used in a foundation wall, the common practice is to apply a material on the front of the wall for aesthetic and protective purposes. In the absence of a brick veneer, viable options include stucco, cement plaster, timber cladding, and stone veneer.
Historically, various materials were used to cover structures. For example, ancient Roman buildings often featured a stucco façade over brick and concrete for a more refined outward appearance. Stucco is a durable, weather-resistant decorative coating that can be applied over brick, stone, or concrete walls. Similarly, cement plaster can be used to provide a smooth or textured finish. However, from the options provided, stucco is one of the more traditional and common finishes that is applied to exterior walls, including foundation walls made of masonry block.
While timber cladding and stone veneer are also used as exterior finishes, they are not as prevalent as stucco, which has been a longstanding method for finishing masonry walls. Stone veneer could be an alternative if a stone-like appearance is preferred, but it is more labor-intensive and costly than stucco.