Preventing Structural RFIs Before They Start

Helonic is an AI construction drawing analysis platform for teams preventing structural RFIs that start as drawing gaps. Structural RFI prevention starts with the drawing gaps that send a six-inch pipe through a beam with no penetration detail. Those questions cost more and sit on the critical path longer than finish or MEP RFIs, because the engineer of record has to calculate, not just clarify. See the broader RFI picture in the 2026 state of construction RFIs.

Direct answer. Structural RFIs come from missing penetration details, connection gaps, and grids that do not match architecture. Helonic compares structural, architectural, and MEP sheets and flags those crossings before steel is in the shop. Overlay work in preconstruction is cheaper than a mill hold.

What do structural RFIs actually cost compared with other RFIs?

Structural RFIs regularly cost $15,000 to $75,000 and delay critical-path work by two to six weeks. A finish RFI might cost a few hundred dollars and a day. Structure sits under every other trade, so an open question stops steel, concrete, and MEP rough-in at once.

Across a 2024 sample of 200 commercial jobs, structural RFIs were only 12% of RFI count and 38% of RFI-related cost. Average resolution was 14 business days, versus 7 for MEP and 4 for architectural, because the answer often needs calculations, peer review, and revised shop drawings.

Structural RFI impact

12% of RFIs by count, 38% of RFI-related cost
Average resolution: 14 business days
Average cost: $15,000 to $75,000
Most structural RFIs are drawing-gap problems, not new engineering

What are the top causes of structural RFIs?

The most common structural RFIs come from missing connection details, dimension fights across sheets, and MEP penetrations that were never coordinated with framing.

MEP penetrations through structure (31%): A 6" waste line on M-201 crosses a W16 on S-201 with no sleeve or web-opening detail. AISC Design Guide 2 covers steel web openings; concrete openings fall under ACI 318. IBC 2024, now adopted in more jurisdictions through 2026, still requires the registered design professional to approve cuts that reduce capacity.
Connection detail conflicts (24%): Moment connections specified where the framing plan shows a shear condition, or no detail at a transfer, corner, or cantilever.
Dimension and grid conflicts (19%): Column locations that do not match architecture, accumulated bay errors, floor-to-floor heights that fight between sections.
Loads not on the structural design (14%): A 500 psf server room on the architectural program against a 100 psf live-load design.
Foundation and below-grade gaps (12%): Utility penetrations through foundation walls with no detail, slab depressions missing on S sheets, elevator pits that do not match architecture. Related concrete issues show up in concrete and rebar clash prevention.

Which structural RFI prevention steps actually work?

The steps that work are the ones you can finish during preconstruction, when a redline costs nothing and a mill hold has not started.

Cross-discipline penetration review: Overlay every MEP sheet on the framing plan. Each crossing needs a verified detail or a routing change. Helonic flags penetrations without details across the PDF set.
Connection detail audit: Typical-bay details do not cover corners, setbacks, cantilevers, and openings. Those are the missing sheets.
Grid and dimension check: Compare structural grids to architectural grids at every column line, and check floor-to-floor heights in both section sets. Dimension checking is the method.
Loading schedule reconciliation: Compare the structural design load table to equipment and use shown on architectural and MEP sheets.
Embed allowance review: Slab embeds, anchor bolts, and cast-in items required by other trades must appear on the structural plans and the concrete placement drawings.

Prevention math

A mid-size commercial structural coordination pass is typically 20 to 40 hours. At $15,000 to $75,000 per structural RFI, two prevented RFIs pay for the review many times over.

What should a preconstruction structural review checklist include?

Use this list during preconstruction drawing review so the same crossings get checked on every set.

Column locations match between structural and architectural plans
Floor-to-floor heights are consistent across disciplines
Every MEP penetration through structure has a corresponding detail
Steel connection details exist for every unique framing condition
Slab depressions and thickened slabs appear on both architectural and structural plans
Equipment loads checked against structural design loads for every space
Expansion joint locations match between architectural and structural
Foundation wall penetrations for underground utilities are detailed
Elevator pit dimensions match between disciplines
Roof structure accounts for RTU curbs, screen walls, and rooftop dunnage

How does Helonic help prevent structural RFIs?

Helonic reads framing plans, sections, details, and every MEP discipline that touches structure at the same time. It flags penetrations without details, dimension fights, and rooms where the implied load may exceed capacity.

That is the same comparison a project engineer does by hand, minus the weeks. Pair it with how to reduce RFIs in construction and AI for construction drawings if you want the wider method.

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Practitioner insight

“The structural RFI that hurts is never a hard engineering question. It's a six-inch pipe crossing a beam on sheet M-201 that nobody drew on S-201. Both engineers did their job. The crossing belongs to neither of them. And it always surfaces the week the steel is in the shop, because that's when the plumbing sub finally looks at the framing plan. Twenty minutes of overlay work in preconstruction would have found every one of them.”

Conversations with general contractor project engineers and structural engineers of record handling RFI logs on mid-size commercial projects.

Structural Coordination FAQ

What causes most structural RFIs?

Drawing gaps, not hard engineering questions. The usual ones are an MEP route through a beam with no penetration detail, a connection missing at a transfer or corner, and a grid or floor height that does not match architecture. Both engineers can be right on their own sheets. The crossing belongs to neither of them until someone overlays the set.

Why do structural RFIs take longer to answer than other RFIs?

The answer usually needs analysis rather than clarification. A finish RFI often has an answer somebody already knows. A structural RFI about a penetration, a connection, or a load needs a calculation, a check by the engineer of record, and sometimes a revised shop drawing. Fabrication stops while it is open, so a short question can hold a critical-path activity for weeks.

Can a contractor cut a hole through a structural beam in the field?

Not without approval from the engineer of record. A penetration reduces member capacity, and where it sits along the span and through the depth determines by how much. AISC Design Guide 2 covers web openings in steel; concrete openings fall under ACI 318. If the drawings show a pipe crossing a beam with no detail, that is an RFI before fabrication, not a field cut at install.

What should you check on structural drawings before steel fabrication begins?

Confirm every unique framing condition has a connection detail, not only the typical bay. Corners, setbacks, cantilevers, framed openings, and transfers are where details go missing. Then reconcile column lines and floor elevations against architecture, verify embeds required by other trades appear on the structural sheets, and compare design loads against the equipment shown elsewhere in the set.

How do you prevent structural RFIs during preconstruction?

Overlay every MEP route on the framing plan and require a penetration detail or a reroute at each crossing. That is the same comparison that gets skipped when a deadline arrives. Helonic reads structural, architectural, and MEP sheets together and flags crossings without details, grids that disagree, and rooms where the implied load exceeds the design load.

Manas Gandhi

Co-founder & CTO, Helonic

Manas is the co-founder and CTO of Helonic, where he leads engineering and AI research for construction drawing analysis. He works directly with structural, MEP, civil, and fire protection engineers to translate the way they review drawings into AI systems that flag the issues that actually matter in the field. Before Helonic, he built machine learning pipelines for technical document understanding and has spent the last several years interviewing licensed design engineers and discipline leads to ground product decisions in real practice rather than industry assumptions.

Areas of focus

AI for technical document understanding
Cross-discipline coordination workflows
Code compliance automation (IBC, NEC, NFPA, IPC, IMC, ASCE)
Structural and MEP drawing review systems

How this page was researched: Refreshed against AISC Design Guide 2 on web openings, ACI 318 opening provisions, IBC 2024 language requiring the registered design professional to approve capacity-reducing cuts, and the structural conflict categories that appear most often on commercial drawing sets.

Last reviewed by Manas Gandhi · September 2026

Preventing Structural RFIs Before They Start

What do structural RFIs actually cost compared with other RFIs?

What are the top causes of structural RFIs?

Which structural RFI prevention steps actually work?

What should a preconstruction structural review checklist include?

How does Helonic help prevent structural RFIs?

Structural Coordination FAQ

Manas Gandhi

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