3 x 12 Stair Stringers
3 x 12 stair stringers can give addition support to a stairway. I have had to use 3 x 12 for building stairs for commercial buildings that require heavy loads and long stringer spans. The floors on these commercial buildings are usually over 10 feet in height. Often they are higher. You will need a 8 - 1/4 saw to cut these stringers.