I've been looking around the internet, and I've seen quite a few stair renovations using common boards with a square edge rather than bull nose stair treads.
Is there a difference between the two beside looks?
Code, wear and tear? The common boards are definitely less expensive and have a larger stock to choose appealing boards from when I buy.
Best Answer
The building code does address the width, profile, and the rounding of the treads.
From the 2009 IBC:
I believe the reason for rounding the leading edge of the tread with wood is to reduce the likelihood of splintering. Also, standard soft pine building lumber is more likely to warp or be damaged with use than a hardwood stair tread.
Good luck with your project.