I have a similar project with brick stairs going to basment (1809 home). The treads are too narrow... around 8". While finishing the basement I took a spill with a 4x8 of drywall in my hand.. not pretty.
I want extend the treads to 10" or 10 1/2". I really want to go 11 but also don't want too much overhang (weak). I was thinking oak plywood with a 3/4" bullnose solid oak edge. Wife wants to keep the brick risers in the back so I can't come out too far otherwise I'd make oak risers also. Thought ply would be stronger since I"m hanging over 1 1/2" to 2" inches.
For securing htem down I was thinking PL400 with tapcons and then oak plugs over the screws. any other thoughts on securing?
good info already here.. any thoughts on this one?
Bejinmin I hope you dont' mind me piggybacking on your post
Mark.