More frequently today, however, the word header refers to a beam-like support in wood-frame construction. The header spans an opening for a window or door, or a cut-out in the roof or floor for a skylight, chimney or staircase.

Typically at least twice the size of surrounding framing members, a header is often built-up from two studs, joists or rafters. It runs between full-length supports and, along its length, carries the loads of the shorter studs, joists or rafters that terminate at the opening.