where is tread depth (unit run) measured from?\no the subfloor to the top tread\no the face of one riser to…

where is tread depth (unit run) measured from?\no the subfloor to the top tread\no the face of one riser to the nosing of the next riser\no the top of one tread to the bottom of the next riser\no the face of one riser to the face of the next riser, not including the nosing

where is tread depth (unit run) measured from?\no the subfloor to the top tread\no the face of one riser to the nosing of the next riser\no the top of one tread to the bottom of the next riser\no the face of one riser to the face of the next riser, not including the nosing

Answer

Brief Explanations:

Tread depth (unit run) in stairs is measured horizontally from the face of one riser to the nosing of the next riser. This is a standard measurement in construction - related contexts for determining the horizontal dimension of each step.

Answer:

the face of one riser to the nosing of the next riser