Structural Opening Review Guide

How to review structural openings for ducts, pipes, sleeves, stairs, shafts, doors, louvers, roof curbs, and equipment access.

StructuralApril 24, 2026

Structural openings allow building systems, circulation, equipment, and architectural elements to pass through framing, walls, slabs, decks, and foundations. Missing or undersized openings cause RFIs, field cuts, reinforcement changes, and installation delays.

The review should confirm that every required opening is shown in the right structural element with the right size, location, edge distance, and reinforcement detail.

Openings to Track

Opening needs come from many drawings. MEP routes, architectural features, elevators, stairs, louvers, doors, roof equipment, and site utilities can all require structural coordination.

Duct, pipe, conduit, cable tray, and sleeve openings.
Shafts, stairs, elevators, roof hatches, and access openings.
Door, window, louver, and storefront openings in structural walls.
Roof curbs, dunnage supports, skylights, and equipment penetrations.
Foundation wall penetrations for site utilities and drainage.

Review Sequence

Start with the systems that need the largest or most constrained openings, then confirm smaller penetrations and sleeves. Large openings affect framing; small openings often affect firestopping and field layout.

Helonic can help by flagging places where MEP or architectural requirements appear to cross structural elements without an obvious coordinated opening.

Frequently Asked Questions

Where do structural opening requirements originate?

Opening needs come from many disciplines: MEP routes, elevators, stairs, louvers, doors, roof equipment, and site utilities all can require an opening in framing, walls, slabs, decks, or foundations. Because the need originates on one discipline and the opening lives on the structural sheet, coordination gaps are common. Tracing each system to a structural element catches missing openings.

How should openings be prioritized in review?

Start with the systems needing the largest or most constrained openings, since large openings affect framing and reinforcement, then confirm smaller penetrations and sleeves. Large openings drive beam sizing and header design, while small penetrations mostly affect firestopping and field layout. Sequencing the review this way surfaces the expensive conflicts first.

What can go wrong with a missing or undersized opening?

A missing opening leads to field cuts, reinforcement changes, RFIs, and delays, and cutting an unreviewed hole in a stressed element can reduce capacity. Beam web openings have restricted zones and maximum sizes set by the engineer under AISC 360. Confirming size, location, and edge distance in the structural details avoids field damage.

What information should a structural opening show?

Each opening should show size, location, the correct structural element, edge distance, and any reinforcement or framing detail such as lintels, headers, or trimmer members. Concrete and masonry openings need added reinforcement per ACI 318 and TMS 402. Missing reinforcement detail forces an RFI before forming.

How does Helonic help with opening coordination?

It compares architectural, structural, and MEP drawings to flag places where a route or feature appears to cross a structural element without a coordinated opening. Those flagged conditions are then confirmed manually. The value is finding the crossing before framing, forming, or fabrication.

MG

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: Opening review points were checked against IBC structural provisions and AISC 360 for framed openings in steel, with concrete and masonry openings cross-referenced to ACI 318 and TMS 402 reinforcement requirements. Examples reflect the opening conflicts Helonic most often flags when comparing architectural, structural, and MEP drawings.

Last reviewed by Manas Gandhi · May 2026

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