That aint how we used to make em! :-)

We always notched for PT at bottom of stringers to avoid contact with masonry and such. I've never seen or personally notched that way for connection to main floor or headed out openings etc. Our stringers were generally pressure blocked to joists, beams and such as well as many more recently attached with joist hangers.

Along a concrete wall I've run into jobs where we used PT against masonry wall and other stringers up to rake wall (or other stud wall) were DF. I can also think of a job where we used/asked to use Moiststop between wall and stringer. With the advent of PT ply i'd now prefer to use all DF stringers and hold away DF with PT ply if they let me.

Last couple we sheathed/sheared under all stringers as well.

With just about all remodel/new being engineered now for structural items such as this....... who knows :-)

__________________