Bottom horizontal member of an exterior wall frame which rests on top a foundation, a.k.a. sill plate.
A wood foundation member, usually a pressure treated 2x4 or 2x6, bolted to the foundation and on which other framing members can be attached.
A wood foundation member bolted to a concrete slab or foundation and on which other framing members can be placed; mudsills are usually pressure-treated 2x4s or 2x6s.
Horizontal piece of pressure-treated board, which is placed and fastened on top of a foundation, upon which the rest of the framing is erected. It is also called a sill plate.
Bottom horizontal member of an exterior wall frame which rests on top a foundation, sometimes called sill plate. Also sole plate, bottom member of interior wall frame.