I am working on a renovation of a home in Pennsylvania that was built in 1979. The width of each run of the main u-shaped staircase which connects the first and second floors is 2'-9". The owner would like to continue this staircase up to the third floor, which is currently accessed via a spiral staircase. Due to the stairwell dimensions at the second floor and conditions at the third floor, it would be impossible to widen the staircase going up to the third floor to meet the current IRC code dimensions for stairs width. Has anyone encountered a similar condition and been allowed to construct a continuation of a non-conforming stair?
Thanks in advance,
Donald
Thanks in advance,
Donald