15.3 Resolving Field Conflicts Between Reinforcement, Embeds & Architectural Openings
Key Takeaways
Check the applicable revisions and reconcile detail callouts and notes before treating them as contradictory.
Notify the contractor immediately of a discrepancy. If it remains uncorrected, notify the building official and the registered design professional in responsible charge before completion of that phase of work.
Refer proposed design changes to the licensed design professional and use the building official’s process for changes to approved documents.
Under ACI 318-19 Section 26.8, submit embedments missing from the construction documents for design review and check whether piping would displace or require cutting or bending reinforcement.
On reinspection, verify the revised work against the approved detail and record the result and any limits on what was observed.
Resolving Field Conflicts Between Reinforcement, Embeds & Architectural Openings
An anchor template may occupy the same space as a top beam bar. A pipe sleeve may overlap a stirrup. An architectural opening may cross a reinforced wall boundary. Start with the exact location and the approved requirement so the contractor and design team can evaluate the actual conflict. In a plans exercise, use the exhibit to identify what is specified and what is still unresolved.
Check the documents before drawing a conclusion
- Identify the grid, member mark, level and face. For a sleeve near a beam, record the sleeve elevation and centerline relative to the beam section and nearby bars.
- Follow the plan’s section callout to the applicable detail. Check whether the note says “typical,” “unless noted otherwise,” or applies only to a particular member, floor or zone.
- Compare the sheet revisions, schedules, specifications and project instructions. Under standard AIA A201 conditions, the drawings and specifications are complementary. A project can state a priority in its supplementary conditions.
- Compare what is installed with the approved requirements. If the documents leave a real conflict, seek clarification. A placing drawing can help locate reinforcement, but a deviation from approved construction documents requires the applicable revision and approval process under International Building Code (IBC) Section 107.4.
For example, a general note specifies No. 4 column ties at 12 inches on center unless closer spacing is shown. Detail 2/S401 calls for No. 4 ties at 4 inches on center within the top 24 inches of column C3. Use 4 inches in the identified zone because the general note expressly makes room for the specific requirement. If one sheet gives an 8-inch thickness and another gives 10 inches for the same wall at the same location, document the conflict and seek clarification. A larger scale by itself does not authorize a change.
Four field conflicts and what to document
| Conflict | Record for review | Why the information matters |
|---|---|---|
| Anchor group intersects main reinforcement | Rod layout and projection, bar size, spacing, cover, and the location of the interference | A change to either layout can affect fit, anchorage or the reinforcement design. |
| Pipe sleeve crosses a beam cage | Sleeve diameter, centerline and relation to the top and bottom bars and stirrups | The designer needs the actual opening geometry and affected bars to evaluate the proposal. |
| Opening encroaches on a special structural wall boundary element | Edge of the opening, wall mark, existing bar and hoop layout and approved opening detail | The boundary reinforcement and its confinement are part of the approved seismic detailing. |
| New floor drain near a column in a flat plate | Drain size, shape and distance from the column face, slab thickness and affected reinforcement | Under ACI 318-19 Section 22.6.4.3, an opening closer than four slab thicknesses to the relevant column, load or reaction perimeter affects how the designer determines the effective critical section. |
The nominal critical section for two-way shear near a column is typically located at from its face, where is effective depth. The opening rule is a separate design check. For example, with a 10-inch slab, is 40 inches. A proposed drain 18 inches from the column face is inside that distance even if the drain is outside the immediate line. Record the geometry and refer the opening for design review. An inspection measurement alone cannot establish the remaining shear strength.
Report the discrepancy and verify the resolution
The inspector records what the approved documents require and what is present in the field. Under IBC Section 1704.2.4, bring the discrepancy to the contractor’s immediate attention. If the contractor corrects the work to the existing approved detail, verify and record the correction. If the discrepancy remains uncorrected, bring it to the attention of the building official and registered design professional in responsible charge before completion of the affected phase. Use the report form and distribution procedures specified for the project.
| Stage | Inspection action |
|---|---|
| Discovery | Tell the contractor immediately. Record the approved detail, observed condition and exact location. |
| Proposed change | The contractor may submit a request for information (RFI) with dimensions and photos through the project’s process. Refer design changes for professional review. |
| Approval | Determine whether the response clarifies an existing requirement or changes the approved design. Obtain the approved amended document where IBC Section 107.4 applies. A sketch or RFI reference alone does not show that the approval process is complete. |
| Reinspection | Compare the work to the applicable approved detail while it is accessible. Record whether it conforms and identify anything that could not be verified. |
| Closeout | Carry open discrepancies and their dispositions into the agency’s required reports. The final report goes to the building official at the time agreed before the start of work. |
IBC Section 1704.2.2 requires the work to remain accessible and exposed until required special inspections or tests are complete. The inspector reports observed conformity and any discrepancy. The contractor manages the work sequence. The building official has formal stop-work authority. On a project with a pre-placement hold point, follow its release procedure and document what you verified.
Pipes, sleeves and other embedments
ACI 318-19 Section 26.8 distinguishes design information and compliance requirements. Use the approved dimensions, type, location and details. Submit the type, size, details and location of proposed embedments missing from the construction documents for review by the licensed design professional. Changes to approved construction documents follow the approval process described above.
- Check the required cover to embedded pipes and fittings and any specified reinforcement perpendicular to the pipe. Use the dimensions and details that apply to that member.
- Protect aluminum embedments as specified to prevent reaction with concrete and electrolytic action between aluminum and steel.
- In a solid slab, piping other than radiant heating or snow-melting piping goes between the top and bottom reinforcement under Section 26.8.2(e).
- Fabricate and install conduit or piping so the reinforcement can stay in its specified location without cutting or bending it to make room, as required by Section 26.8.2(f).
An unshown 6-inch sleeve that overlaps top bars in a transfer girder requires review of the actual sleeve and member geometry. The project drawings can set opening restrictions or prescribe a reinforced sleeve detail. Record which bars the proposed opening intersects and verify any approved routing or detail before concealment.
Verify the approved detail in the field
If the design professional relocates the sleeve, check its new grid offset and elevation and remeasure the clearance from the reinforcement. If the approved detail specifies trim bars around an opening, verify their quantity, size, position and anchorage from that detail. A standard trim detail for one opening does not establish the reinforcement for another opening.
If an approved revision uses offset-bent longitudinal column bars, ACI 318-19 Section 10.7.4 limits the offset slope to 1 in 6 and requires parallel bar portions above and below the offset. Where the column face offset is 3 inches or more, that provision requires separate lap-spliced dowels in place of offset-bending the longitudinal bars. The relevant approved detail provides the bar placement and transverse support. A template conflict alone gives the field crew no permission to bend a bar.
Record the grid and element, document and revision number, what was changed, measured dimensions and date. If the work was covered before reinspection, describe the unavailable observation and follow the project’s discrepancy resolution process. Use the record to support the agency’s final reporting under Section 1704.2.4.
An anchor rod cage at a grade beam pier cap clashes with two top longitudinal bars in the approved layout. What is the inspector’s first action?
Approve flame cutting the conflicting bars if two replacements are nearby.
Authorize field bending of the rods to clear the cage.
Notify the contractor immediately and document the interference for resolution.
Move the template and verify the rods against the changed layout.
A proposed 6-inch pipe sleeve in a transfer girder is missing from the approved documents and overlaps the specified top bars. What should happen before it is installed?
Install the sleeve because its size is under 8 inches.
Move the top bars aside while preserving the count.
Defer the opening until the concrete reaches 75% of specified strength, then core it.
Submit the sleeve type, size, details and location for design review and resolve the conflict through the applicable approval process.
The inspector has notified the contractor of a discrepancy, but it remains uncorrected. Who must be notified, and by when, under IBC Section 1704.2.4?
Only the owner, at the next progress meeting.
The building official and the registered design professional in responsible charge, before completion of the affected phase.
Only the contractor again, after the affected work is concealed.
The licensing board, within 24 hours.
General Note S001 says to use No. 4 bars at 12 inches on center for elevated slab temperature reinforcement unless a detail specifies a different layout. Detail 3/S502 identifies a cantilever and calls for No. 5 bars at 8 inches on center, top and bottom. What layout does the exhibit specify in the cantilever?
No. 4 at 12 inches, because the general note applies without exception.
No. 5 at 8 inches, top and bottom, because the note makes an exception for the layout in the applicable detail.
Either layout at the contractor’s discretion.
No. 5 at 8 inches in the top mat only.
The contractor installed a sleeve at a new location based on a proposed sketch. The move departs from approved construction documents, and the sketch has not completed the required approval. What is the inspector’s finding?
Mark the installation conforming because a sketch number exists.
Document the discrepancy and verify any correction against the approved amended documents after they are available.
Mark the installation conforming if the opening looks smaller than the sleeve in the original detail.
Treat the sketch as approved if the contractor has entered it on a record drawing.
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