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BIM coordination settings improve renovation clash detection when the team agrees on model scope, discipline pairings, search rules, and project-specific tolerances before running checks. Just as important, the team must account for uncertainty in existing conditions, consolidate duplicate results into actionable issues, and document each accepted issue with an owner, status, due date, and clear viewpoint.
A clash report is a coordination aid, not a verdict: an intersection may be a genuine design conflict, a clearance problem, an intentional condition, or a symptom of inaccurate existing-condition data. The settings and documentation should help the team distinguish among those cases and make the decision traceable.
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What should the coordination setup establish first?
Before opening a clash-detection tool, establish what the check is meant to answer and who is responsible for acting on its results. The BIM execution plan, or the project’s equivalent coordination agreement, is the right place to define the model set, discipline responsibilities, federation approach, checking frequency, review roles, and milestone deliverables. NATSPEC’s National BIM Guide identifies an agreed federation strategy, responsibility matrix, spatial boundaries, model tolerances, and coordination frequency as parts of coordinated practice.
For renovation work, identify the existing-conditions model as its own input rather than blending its provenance into the design models. Record where that information came from and any known limitations. The National Institute of Building Sciences (NIBS) guidance on coordinating design and construction specifically treats uncertainty and tolerances in source data—including existing-conditions models—as coordination considerations. A detected overlap with an old wall or slab is therefore a signal to investigate, not proof that the model represents the field condition exactly.
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Set the coordination basis in terms the project team can apply consistently:
- Model inputs: identify the discipline models and existing-conditions information included in each check.
- Model versions: record which versions were federated for each run so later reviewers can reconstruct the context of an issue.
- Responsibility: name who authors each model, who reviews issues, and who can accept or close them.
- Coordination boundaries: define the spatial areas, systems, and project stage covered by each check.
- Schedule: agree on when checks occur and what reports or issue records are due at each milestone.
Do not let the software’s default project configuration silently become the project standard. The agreement should state which conditions the team intends to identify and how each will be handled.
How should renovation models and existing conditions be handled?
Check alignment and model comparability before interpreting intersections. Renovation models may combine surveyed or otherwise sourced existing information with new design models, and the source data can carry different levels of certainty. NIBS identifies existing-condition data uncertainty as a coordination consideration; the German Federal Trunk Roads EIR framework also describes checking against existing structures and against agreed project information requirements.
Make the uncertainty visible in the coordination record. If a conflict depends on a concealed or uncertain existing element, flag that qualification so the team can determine whether additional verification is needed. Do not silently treat the modeled position as a verified field location, and do not suppress a result solely because the existing model may be uncertain. The useful outcome is a documented decision about the uncertainty and its next action.
Keep the check aligned to the current project stage. Some elements may not yet be modeled, or some design conditions may be intentionally deferred. NIBS notes that some elements may be absent from models and that the project should define what may remain a coordination concern. Record exclusions and deferred items in the agreed scope rather than allowing them to disappear from discussion.
Which discipline pairings and search sets should be used?
Build a clash matrix around the project’s risks and construction sequence. Choose discipline pairings that answer meaningful questions—for example, whether structural elements conflict with mechanical, electrical, or plumbing services—instead of running every possible combination without a defined purpose. The matrix should make clear which model sets are compared and what each check is expected to catch.
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Create selection or search sets for the elements relevant to each check. The Singapore BIM Guide Version 2 recommends planned search sets and clash rules to reduce false positives, hide items that do not affect the current check, and focus a test on a specific coordination task. For example, a structure-versus-services check should include the relevant structural and service elements, not unrelated categories simply because they happen to be in the federated model.
Exclusions need a reason and a boundary. It may be appropriate to leave out known irrelevant or deferred items for a particular milestone, but document what was excluded, why, and whether it must be checked later. Otherwise, a cleaner report can create a false impression that the design has been fully coordinated.
Separate geometric hard clashes from soft constraints such as required clearance, access, and serviceability. The Smithsonian SI BIM Guidelines call for hard and soft clashes in the checking process. NIBS describes coordination as including clearances and accessibility, while NATSPEC also points to buildability and service access. A model can contain no direct intersections and still leave equipment impossible to reach or maintain.
How should clash tolerances be set?
Use the tolerance agreed for the project and the purpose of the particular check. The German EIR framework describes checks within agreed tolerances, and NATSPEC likewise identifies project-agreed model tolerances. Neither supports a universal number that should be copied from another project, software profile, or code-checking configuration.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsIn practical terms, distinguish the tolerance from the coordination decision. A tolerance is a rule for identifying or filtering geometric conditions; it does not by itself establish that a condition is acceptable, buildable, or compliant with the project requirements. Set the rule in the coordination agreement, apply it consistently within the relevant test, and review borderline or consequential findings in context.
When a tolerance changes, preserve the reason and the affected test scope in the project record. Otherwise, a later report may be difficult to compare with earlier runs: a lower count could reflect changed geometry, a changed tolerance, a narrower search set, or some combination. Treat those as different explanations rather than assuming the design improved.
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How do you turn a clash report into usable coordination issues?
Review findings in context and consolidate results that describe the same underlying condition before assigning work. The Singapore BIM Guide illustrates why: one pipe-to-steel issue can produce 20 clash instances. Those are multiple software results, not automatically 20 separate design problems.
- Run the planned tests. Use the identified model versions, pairings, selection sets, and tolerance rules for the milestone.
- Inspect each finding. Review the elements and surrounding model context, including whether the condition is a hard intersection, a clearance/access issue, or a likely data problem.
- Group duplicates. Combine repeated instances when they point to one underlying condition that can be resolved through a single coordination action. Keep separate issues where the locations, owners, or remedies genuinely differ.
- Classify the disposition. Decide whether the finding is a confirmed conflict, intentional condition, deferred item, uncertain existing condition, or non-issue under the agreed scope.
- Assign the next action. For accepted issues, identify the responsible party and the expected resolution or decision.
A clash result is a prompt for review, not an automatic instruction to move an element. The Singapore guide cautions that not every detected conflict is a problem. Likewise, an item that is not a direct geometric intersection may still be an important coordination concern if it affects access, clearance, or buildability. Make the disposition explicit so the report does not confuse a raw detection with an agreed design decision.
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An accepted issue should let another team member understand the problem, locate it, take responsibility, and track the decision through closure. The German Federal Trunk Roads Employer Information Requirements framework lists BCF message information including author, responsibility, object, problem, solution, status, due date, and a useful viewpoint.
Use those fields as a practical minimum, adapted to the project’s agreed issue workflow:
- Owner or responsible party: who must respond or coordinate the next step.
- Affected object or elements: what is involved, identified in a way the team can locate in the model.
- Problem statement: a concise explanation of the conflict or coordination concern.
- Proposed solution or decision needed: what action is expected, while distinguishing a suggestion from an approved design change.
- Status and due date: whether the item is open, under review, resolved, or otherwise classified under the project workflow, and when action is due.
- Viewpoint: a useful visual reference that shows the issue in a reviewable location and context.
Keep the underlying evidence with the issue trail: the report from the run, the model versions used, and the decision or resolution history. Massachusetts BIM guidance assigns the BIM manager responsibility for model integration and interference checks before construction-document issuance and refers to report templates and visual captures. That supports keeping coordination results and visual evidence together rather than relying on an unannotated clash count.
What should happen to unresolved clashes at a milestone?
Report what remains open and explain its disposition at the relevant deliverable milestone. Do not silently carry an unresolved item into a final submission as though the report were complete. The Smithsonian guidelines call for clash-detection reports beginning at specified design milestones for Smithsonian projects and a separate narrative explaining why clashes left unresolved at final submission could not or need not be resolved.
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Those milestone requirements are specific to Smithsonian projects; they are not a universal schedule for every renovation. Use the owner’s contract documents and the project BIM execution plan to determine the applicable milestone dates and required deliverables. The general coordination principle still applies: an open item should have a visible status, an accountable party or reason for acceptance, and an explanation of its risk or disposition appropriate to the project.
For each reporting checkpoint, make it possible to distinguish issues that were resolved from those that remain accepted, deferred, or under review. A report should explain the state of coordination, not merely show that a clash test ran.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How should a team choose a coordination workflow or tool?
Choose around the team’s required process, model compatibility, and deliverables—not a claim that one tool is best for every renovation. NIBS identifies model aggregation, model collaboration, and issue-management software as relevant methods and tools. The Smithsonian guidelines name Revit and Autodesk Navisworks as tools from which clash reports can be generated, but that does not establish a universal ranking or prove either is the right fit for every project.
Before committing to a workflow, confirm that it can support the project’s model formats and federation approach; selection sets and discipline-pair checks; project-specific tolerance rules; contextual review and issue grouping; issue ownership and status tracking; and report or viewpoint outputs that fit the required exchange process. Then confirm that the workflow fits the owner’s information requirements, the team’s skills, and the delivery milestones. A technically capable checker is not useful if the team cannot reliably review or close its findings.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallKeep the tool choice separate from the coordination standard. The agreement should define the rules, records, responsibilities, and decisions that the team needs regardless of which compatible software produces the reports.
How can a coordinator tell whether the settings are working?
Review whether the settings produce findings the team can interpret and act on—not simply whether the report contains fewer results. A useful check has a clear scope, identifies the model versions and rules applied, avoids irrelevant categories where justified, and makes it possible to locate each accepted issue and follow it to a decision.
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When results are noisy, diagnose the cause before changing settings. Check whether search sets include unrelated elements, whether duplicate instances need grouping, whether the model alignment or source certainty is in question, and whether the team is mixing hard clashes with clearance checks. A change to the test configuration should be recorded so reviewers can understand how it affects the report and comparisons between milestones.
The central control is traceability: anyone reviewing the coordination record should be able to tell what was checked, what was excluded, what the result meant, who owned each accepted issue, and what happened next. That is what turns clash detection from a one-time model scan into a renovation coordination process.
Frequently Asked Questions
Should a clash report be treated as proof that an existing wall or slab is in the wrong place?
No. Existing-conditions models may contain source-data uncertainty, so an intersection can signal a need to check the underlying information rather than prove the field condition. Keep that uncertainty visible in the issue record and have the project team decide what verification or design action is appropriate.
Does a clash-free model mean the renovation is fully coordinated?
Not necessarily. Direct geometric intersections are only part of coordination; access, clearance, accessibility, and buildability can also matter. The project’s check scope should say which of those conditions are being reviewed.
Can the same clash tolerance be used on every renovation project?
The cited guidance calls for tolerances agreed for the project, not a universal value. A tolerance should be selected for the project’s requirements and the purpose of the particular check, then applied consistently and documented.
What should the owner specify about clash reports?
The owner’s contract documents and BIM execution plan should establish applicable coordination milestones and deliverables. They should also make clear how open items are reported and how accepted residual conditions are explained; Smithsonian milestone provisions apply to its own projects rather than automatically governing other owners.
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