The stringer is the backbone of the structure.
Stair tread return length.
Stringers risers and treads.
A 42 left return tread is 42 long overall and has a 40 3 4 throat 42 tread 1 1 4 return return this is a 1 1 4 solid stave that is bullnosed on one side and glued to fit along the open end of the stair tread.
Stringers are the diagonally placed boards anchored at the top the header and the bottom the footer of the staircase.
Double return stair treads have a mitered return on both the left and right ends.
Because the mitered returns are both 1 wide the overall width of a double return stair tread will always be 2.
Double return stair treads are always measured by the throat dimension the length between the two mitered returns.
There are three main components in a standard staircase.
Returns can also be added to existing treads as molding.