3/4" vs 1" oak stair treads and risers and recommended lip width
I'm ripping out the carpent on the stairs in my house and installing oak treads and risers. My staircase has 13 steps and is fairly steep with a 7.5" rise and 8.5" tread. I would like to make the treads wider. Is there a standard or code specification for the overlap/ lip of treads? I was hoping to use a 1" lip to widen the treatds but I don't want to break code (MD) or have the lip impede the function of the stairs.
Also, pre-planed treads and risers always seem to be sold as butcher block style assembled slabs of 1" thick red oak. To save money, I was thinking of purchasing solid 4/4 red oak and jointing/planing/routing it myself into 3/4" thick treads and risers. The underlayment on my stairs is 3/4" ply. Is there any reason that I should use 1" thick treads and risers if I'm building them from scratch? Is it a mistake to use solid wood treads due to the risk of warping? Any other wood options I should consider other than red oak?