What is defined as the horizontal part at the bottom of a window or door frame?

The term that signifies the horizontal component at the bottom of a window or door frame is referred to as the sill. This structural element plays a crucial role in preventing water from entering the interior of a building and helps support the frame. Additionally, it is designed to accommodate various finishing materials and ensures proper alignment and function of the window or door.

The other terms listed refer to different concepts: a beam is typically a horizontal support structure meant to carry loads, shoring refers to temporary structures used to support a building or its elements during construction or repair, and a slab usually pertains to a flat, horizontal surface made of concrete used in floors or ceilings. Understanding these definitions is essential for grasping the fundamentals of construction terminology and ensuring effective communication in the industry.