In alt.home.repair, on Mon, 26 Apr 2021 13:01:16 +0000, Gman
wrote:

Nuts? Its pretty common to spread 2x6s on a 36 inch span on stair treads

I don't think a third stringer is worth it.

I played 3rd string for the Otumwa Mudhens and I didn't help the team at
all.