The Detailer's Guide to Reading a Structural Engineer's General Notes

Most detailers read the general notes once, maybe skim them for material specs, and then spend the rest of the project working off the framing plans and detail sheets. That's a mistake — and on complex projects, it's a mistake that shows up as a rejected submittal or a field conflict. The general notes sheet is the EOR's governing document for the entire structural package. It specifies the material grades that apply when the plans don't call one out explicitly. It sets the welding standard that controls every weld on the project. It calls the connection design criteria that your moment connections have to meet. It lists the special inspection requirements that determine how your shop drawings get flagged and what the inspector is looking for when they show up on the fab floor. Reading general notes carefully is the difference between a detailer who produces drawings that hold up through submittal review and one who generates RFIs and redraws.

The Anatomy of a Structural General Notes Sheet

EORs don't all organize their general notes the same way, but most competent sets follow a recognizable structure. You'll typically see: governing codes and referenced standards up front, followed by material specifications, then fabrication and erection standards, welding requirements, connection design criteria, special inspection language, and miscellaneous notes at the end.

The code block at the top tells you which edition of IBC is governing, which version of ASCE 7 was used for load determination, and which edition of AISC 360 controls the structural steel design. These aren't formalities. If the notes reference AISC 360-16 but the project is in a jurisdiction that has adopted IBC 2021 (which references AISC 360-22), you've got a potential conflict worth flagging. Same goes for AWS D1.1 edition callouts — the prequalified joint details and preheat tables changed between editions, and using the wrong one in your weld procedure coordination can create problems during special inspection.

Material Specifications in the Notes

Material callouts in the general notes establish defaults. When the framing plan shows a W14x48 with no material grade annotation, the grade is whatever the notes specify — usually A992 for wide flanges. Understanding what each specification actually means keeps you from making silent assumptions.

A992 is the standard for W-shapes used in seismic and general structural applications. It has a yield-to-tensile ratio limit of 0.85 and a maximum yield strength of 65 ksi, which matters for plastic hinge behavior in seismic moment frames. If you're detailing an SMF or IMF, A992 isn't just a preference — it's required by AISC 341.

A36 still shows up for plates, base plates, and some miscellaneous steel. It's a 36 ksi yield material. Don't assume A36 and A992 are interchangeable for any connection calculation — they're not.

A500 Grade C is the standard for HSS sections, with a minimum yield of 50 ksi for round sections and 50 ksi for rectangular. If the notes call A500 Gr. B and the fabricator is sourcing Gr. C, flag it — Gr. C is a higher yield and is generally acceptable as a substitution, but that determination belongs to the EOR, not the shop floor.

A325 / F1852 and A490 are the bolt specifications. A325 (or the direct-tension-indicator equivalent F1852) is a 120/105 ksi bolt. A490 is 150/130 ksi. The notes will usually specify which is required and whether the bolts are to be installed snug-tight, pretensioned, or in a slip-critical condition per RCSC. That installation requirement flows directly from your connection design and affects what you need to communicate on the shop drawing callout.

Welding Standards Called in the Notes

Nearly every structural steel set will reference AWS D1.1, the Structural Welding Code for Steel. What varies is how the EOR applies it and what additional requirements they layer on top.

Prequalified vs. qualified procedures is a distinction that matters in practice. Prequalified joints per AWS D1.1 Clause 3 don't require a WPS qualification test — they're accepted as long as the joint geometry, base metal, filler metal, and preheat meet the listed requirements. Qualified procedures require testing. If the notes specify that all CJP welds in primary connections require qualified procedures rather than prequalified, that's a cost and schedule implication for the fabricator that needs to surface during bid.

Preheat requirements are sometimes explicitly listed in the general notes for specific base metal thicknesses or grades. If you're detailing connections with material over 1-1/2" thick in a low-hydrogen environment, or connecting A913 Grade 65 members, the preheat requirements are non-trivial and the notes should be specific. If they're not, that's an RFI.

Demand critical welds in seismic applications get called out separately. On SDC D, E, or F projects, the EOR should identify which welds are demand critical under AISC 341. If the notes don't address this on a seismic project, it's a gap worth raising with the EOR before IFC.

Connection Standards and What "Typical" Actually Means

General notes often reference AISC connection tables or specify that connections are to be designed for a minimum capacity — "all beam-to-column shear connections shall be designed for not less than 50% of the beam's uniform load capacity" is a common note. This isn't boilerplate. It sets a design floor that controls your minimum bolt count and weld size even when the actual beam load is lower.

"Typical" connections shown in the notes or on a detail sheet are typical until they're not. The frame plan may show TYP next to a connection callout for twenty locations, but three of those locations have concentrated loads, eccentric conditions, or cope restrictions that make the typical detail non-conforming. Part of a detailer's job is identifying where the typical stops applying. If you run a W18x35 framing into a W12 column web and the typical connection is a three-bolt standard shear tab that won't fit in the available depth, the typical doesn't apply — and the solution isn't to squeeze it in, it's to write an RFI.

Special Inspection Language and What It Obligates

The special inspection section of the general notes is where a lot of detailers glaze over. Don't. This section defines what the special inspector is going to be looking for on your shop drawings and on the fabricator's floor, and it has a direct bearing on how you flag and document connections.

IBC Chapter 17 governs special inspection requirements for structural steel. The general notes should identify the Statement of Special Inspections (SSI) and call out which operations require continuous inspection, periodic inspection, or no inspection. CJP welds in primary members typically require continuous inspection. Pretensioned high-strength bolted connections typically require periodic inspection.

As the detailer, your obligation is to make sure the shop drawings clearly identify the weld type, size, process, and filler metal at every location that falls under special inspection. An inspector who shows up to verify a demand critical CJP weld and finds a shop drawing that just says "weld here" is going to generate a non-conformance report. That becomes your revision cycle.

When a General Note and a Specific Detail Disagree

This happens more often than it should. The general notes say all column base plates are A36; a specific detail on sheet S-7 calls the base plate as A572 Gr. 50. Which governs?

The industry default, supported by AISC and standard contract language, is that specific details govern over general notes. But "industry default" isn't the same as "what the EOR intended," and it's not a substitution for written confirmation. When a note and a detail conflict, write an RFI. Document the conflict precisely — quote both the note and the detail, identify the affected members, and ask the EOR to confirm which governs. A one-line RFI takes two minutes. A rejected submittal because you silently chose one interpretation costs everyone a week.

Red Flags in a General Notes Sheet

Experienced detailers learn to scan for certain warning signs during the first read-through:

Conflicting code editions — IBC 2018 cited in the title block but AISC 360-22 referenced in the notes. These can coexist legitimately, but they can also indicate a notes sheet that was copied from a previous project without update.

Missing material specs — A general notes sheet that doesn't explicitly specify the governing material for W-shapes, HSS, and bolts forces you to make assumptions. Assumptions become RFIs, or they become errors.

Generic seismic language on a high-SDC project — If the project is SDC D and the notes don't call out AISC 341, don't call demand critical welds, and don't address protected zones, that's not a minor oversight.

No welding standard edition cited — AWS D1.1 is updated on a two-year cycle. "Per AWS D1.1" without an edition year is ambiguous.

Using the Notes to Write Better RFIs

The general notes are your reference document when an RFI goes out. A strong RFI doesn't just ask a question — it cites the relevant note, identifies the condition in the drawings that creates the ambiguity, and proposes interpretations if appropriate. "Per Note 4.3, all W-shape columns are A992. Detail 6/S-4 calls the W10x49 transfer column as A36. Please confirm governing material grade." That's a clean RFI. The EOR can answer it in a sentence.

Detailers who read the notes carefully write fewer RFIs overall — and the ones they do write are better. On a project with a compressed submittal window, fewer revision cycles and cleaner questions are worth real time.

NRSteel works exclusively with fabricators on commercial and institutional structural steel projects. If you're looking for a detailing partner who reads the full set before touching Tekla, get in touch to talk through your next job.