Rebar is one of the most familiar materials on a job site and one of the most frequently misspecified when a project moves fast. Size and grade both carry real engineering weight, and getting either one wrong changes the structural performance of the finished pour.
Bar sizes are numbered according to diameter in eighths of an inch, so a #4 bar is a half inch in diameter, and so on up the scale. Grade refers to the steel's yield strength, with Grade 60 serving as the standard for most general construction and higher grades reserved for applications with greater load demands. The right selection depends on the span, the load path, and the specific structural requirements of the pour, not a default habit carried over from the last job.
We put together a full breakdown of rebar sizing, grades, and reinforcement fundamentals on our blog for engineers, contractors, and project managers who want a clear reference. Link is in the comments.
How often does your team revisit rebar specs mid-project versus locking them in early and moving forward?
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