In construction, this term denotes the underlying layer or material upon which another material or system is applied. It serves as the foundation, providing support and adhesion for subsequent layers like flooring, roofing, coatings, or paving. For example, a concrete slab acts as the base for tile flooring, or compacted soil supports a paved road.
The integrity of the entire construction project hinges on the quality and preparation of this underlying layer. A properly prepared one ensures durability, stability, and longevity of the finished product. Historically, natural materials like earth and stone fulfilled this role. Modern construction employs a wider range of options, including concrete, asphalt, and engineered fill, each selected based on project requirements and performance criteria.