Hopefully a quick question for someone. I have a closed stair stringer that used to be embedded in a non load bearing wall that has been removed leaving only the ~1 1/2" stair stringer remaining. I want to put a handrail on it with balusters etc. Is there a minimum width for the shoe rail? In order to extend the stringer width to accommodate the shoe rail I was going to attach a long piece of 2x10 to the side of the stringer to give the extra width. Is there a better way to do this?
Typical Balusters will tend to make the stringer rotate when a force is applied perpendicular to the stairway. (Code requires a resistance of 200 lbs. applied at the top of the guardrail and perpendicular to the guardrail.) I’d try installing several newel posts along the stairway. They could extend from the floor up to the guardrail height so they won’t rotate.