I am extending the width of my stairs, and need to remove the existing sub treads and risers. They appear to be glued (construction adhesive I'm guessing because it is brown) and nailed. Is this going to destroy the stair stringer when I remove them?
In case it is helpful, the reason why I am removing them is that I want to install new, wider subtreads and risers so that the wood flooring that is attached to them has a continuous surface. The new wider subtreads and risers would be attached to two new trus joist stringers that will be installed where the previous pony/cheek wall was (where you see the exposed 2x4s in the images below).
An alternative would be to just add new subtreads/risers for the additional width of the stairs, and make sure that they are level. But I think that is risky because there would be effectively 2 separate surfaces/platforms that the finished treads and risers would be attached to, which could lead to problems in terms of wood movement, etc. I'm trying to decide which is the less risky path.