Final answer:
The board known as a sill plate is affixed horizontally to stakes at the building's future corners, serving as the initial framing section that connects the concrete foundation to the wall studs.
Step-by-step explanation:
The board that is fastened horizontally to stakes placed on the outside of where the corners of a building will be located is called a sill plate. The sill plate serves as a key component in the foundation of a structure. It is the first section of framing that sits directly on top of the concrete foundation, providing a connecting surface between the foundation and the wall studs that will be installed above it. The anchor bolts are set in the concrete and stick up above the foundation; the sill plate is then secured to these bolts, creating a stable and level base for the subsequent construction. Precast concrete footing and bottom plate are related to the construction process but do not describe the part that is fastened horizontally to stakes at the corners of the building's location.