Eventually I'm going to build a simple staircase out one of my back
windows into my yard * currently I have to go to the basement to get to
the yard.

The staircase will rest on metal and concrete, which is a bad thing, no?

Wondering if there's any techniques people use to space wood from
concrete/metal? I'm imagining tough plastic or wood "dowels" that would
work as spacers, or strips of rubber or plastic.

Any ideas appreciated.

-Ben