I am removing the 1st floor wall section of my stairs. The stairs were constructed with stringers under the treads, but a closed skirt board was attached. I have removed the walls surrounding the stairs and the old skirt board.
Should I add a false stringer mounted all the way at the ends of the new, longer, treads or should I build a small wall with different height top plates to effectively make a stringer but provides a nailing surface for drywall?
EDIT: Sorry, I really asked by question poorly...
The stairs are supported by 3, strong, full length stringers. I will not be changing the construction of structural part of these stairs. The two outside stringers are right at the edge of the current tread.
Open stairs is exactly what I am doing, in fact I have already finished opening them... What I need to do is build a wall on either side of the outside stringers to support the last few inches of new, longer, tread as well as support new drywall. Note that that last 2' of the first floor wall, which previously enclosed the stairs, is still present.
My question is actually about the construction of this new wall. Should I basically just build a stair shaped wall? Should I install a false stringer to get the stair shape, or just make the stair shape from 2x4s? I want to be able to bring drywall right up to the bottom of the new treads.