I am replacing pine treads with oak treads and find that the stairs were meant for carpet. The stringers are cut into the sheetroc so I need to hide the gaps. I decided to move the stringers inward about an inch and add a skirt board to trin it out. My question is how do you determine the dimensions for a rectangular board that will be on maybe a 45 degree slope. I don't want to use the trial and error method like I do for most projects Thanks in advance for your help.
# of treads = 7 Ht of riser = 7 1/4" length of tread = 35"