Joinery Stair Stringer board width

What width stringer should I use for this to meet strength requirements?

I’m building stringers using joinery something similar to

https://i.pinimg.com/originals/c1/79/a8/c179a88f9dbbbe7666a2d5f7d07e997b.jpg

I think 2×12’s are going to be too thin to serve as a stringer. I plan to router out the size of the step 1 inch deep + create a hole for a 2×4 sized poke through like this picture.

What am i looking for here in terms of stringer width 3×12? 4×12? I could do 2×12 with a supporting spine straight board.

I called the inspector to pre approve the project before I went down this path. One guy said yes,he retired, I showed a mock up and the next guy said no, stringer violates IBC chapter 10 Stairs. Theyre closed for covid and I’m still waiting on an answer. Ive read chapter 10 repeatedly, I don’t see the stringer violation.

Actually all very good, garden looking a lot better although cant face lawnmower, woodworking jobs underway, struggling to set up larger astronomical telescope clouds not helping, bloody busy.

@LesStonehouse @MorpheusBeing Actually all very good, garden looking a lot better although can’t face lawnmower, woodworking jobs underway, struggling to set up larger astronomical telescope (clouds not helping), bloody busy.

i literally have to become a woodworking lesbian in the next 3 months because abi is collecting books at an alarming rate and we can only have so many Ikea bookcases. plus, in this economy we may very well have to build a log cabin

RT @egplantparmesan: i literally have to become a woodworking lesbian in the next 3 months because abi is collecting books at an alarming rate and we can only have so many Ikea bookcases. plus, in this economy we may very well have to build a log cabin

I am Minjara.A business with a hint of yearning for the good-old-days, established by Riyad Abdul Ja…

I am Minjara.A business with a hint of yearning for the good-old-days, established by Riyad Abdul Jalil in 1958 in Tal Latifieh Street, in Tripoli, creating classical and neoclassical furniture upholstery.

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