Furnished content.
(from Lumberjocks.com)
The old staircase was pretty steep, not too stable and the treads were only 9” deep. The single stringer was only 9” and had several deep splits. I used 12” double fir stringers and 12” fir for the treads. The new staircase is incredibly sturdy now and will last for many years. I personally preferred the stairs without paint and carpet, but the homeowner chose carpet for better grip.