Have a question about the best method of repairing the siding on my workshop. I have a detached workshop which was built in 2003. The exterior siding is T1-11 which was installed directly over the studs with no insulation or vapor barrier. The bottom of the siding has sustained water damage over the years and is delaminating/crumbling for about 6 to 8 inches from the bottom. My question is, other than replacing entire sheets of the siding, what is the best way to repair this damage? I have seen online some examples of using a band, or cutting away the old T1-11 and replacing it with the same material with z-channel etc. I am sure some of you guys have experience with this type of repair. Can you guide me to some videos etc or give me detailed instructions on how to do this repair. Thanks for any suggestions or comments.

I live in a house that was built in the 40's. One side of the basement entry stairwell is the well-house. The two walls of the stairwell are approx 3-inches different in height at the house. Approx 6 feet out, the walls step down 10 inches and finally meet the sidewalk almost 12 feet from the house. Rather than excavate and build a new stairwell, I want to frame this in and install a set of diy "Bilco" doors. In western PA, I want to eliminate snow, leaves, etc. from accumulating in the stairwell. My question is regarding what materials to use. A simple treated lumber frame and corrugated metal siding? some type of moisture resistant sheet good? Aesthetics is important, but secondary to function. Any recommendations would be much appreciated! Thanks