Top plate: Usually 2x4.
Sole plate: Usually 2x4.
Studs: Usually 2x4.
Header: Size is determined by length. Usually 4" and 1" thickness per 12" of length.
Trimmer: Supports the header. Usually 2x4.
Sill plate: Stud underneath the window. Usually 2x4.
Cripple: Supports the sill plate.
新建的房子很多都用2 x 6 Stud, 这样可以用较厚的保温材料。
