I never noticed it before but Table R404.1.1(5) does not give the horizontal reinforcement for concrete foundation walls... only vertical.
But every engineered wall will note both horizontal and vertical.
And so I spent today building an easy-to-use spreadsheet that will calculate the minimum steel reinforcement for grade beams and trench footing based on the book, "Simplified Engineering for Architects & Engineers".
The results are consistent with the IRC table for plain concrete (no reinforcement necessary).
Is there anything out there that would justify and/or help calculate the minimum size and spacing for horizontal rebar?
ICC Certified Building Plan Examiner