Rim joist
Encyclopedia
In the framing of a deck or building, a rim joist is the final joist that caps the end of the row of joists that support a floor or ceiling. A rim joist makes up the end of the box that comprises the floor system.

The header
Framing (construction)
Framing, in construction known as light-frame construction, is a building technique based around structural members, usually called studs, which provide a stable frame to which interior and exterior wall coverings are attached, and covered by a roof comprising horizontal ceiling joists and sloping...

 is to a rim joist what the top or bottom Wall plate
Wall plate
A wall plate, a structural element in the light frame construction method known as platform framing, is a horizontally laid structural element at right angles to the load-bearing part of the vertical load of a building...

 is to an end stud
Wall stud
A wall stud is a vertical member in the light frame construction techniques called balloon framing and platform framing of a building's wall.-Purpose:...

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