Deck stair stringers, landing, and footers help please
I am building new stairs for my deck that will be 84″ wide. The treads will be 16″ deep. We are using the Simpson strong tie tread brackets for the outermost stringers, but will need to obviously use cut stringers for the remaining support stringers in between.
First question: Will a 2×20 be significant enough for a 16″ tread cut?
Second question: for an 84″ wide landing, can I get away with the free floating slab and have my handrail posts attached via standoff brackets, or do I need footers to the frostline and THEN the slab over that? And if I need to use these sonotube footers under the slab, how many for an 84″ width?