In building construction, what term is used for the horizontal board that conceals the rafter ends?

The horizontal board that conceals the rafter ends is known as fascia. Fascia serves both a functional and aesthetic purpose in building construction. Functionally, it helps to protect the edges of the roof and the underlying structure from weather elements, such as rain and snow, which could cause deterioration. Aesthetically, fascia provides a finished look to the edges of a roof, enhancing the overall visual appeal of the building.

In contrast, frieze refers to a decorative horizontal band that is often found on the upper part of walls or just below the roofline, but it does not specifically cover rafter ends. A header is typically a horizontal structural element placed over openings, such as doors and windows, to support the weight of the structure above, and does not relate to concealing rafter ends. Brackets, while they may be used for decorative support of eaves or overhangs, also do not serve the same purpose as fascia in covering rafter ends.