ICC 67 common mistakes
ICC 67 · Understand the traps and how to avoid them.
Treating fire-flow calculations as a single formula and plugging numbers without first confirming which flow-test method (NFF or hydrant-flow) the stem describes, then selecting an answer built on the wrong method.
Candidates memorize one equation and pattern-match to any numbers in the item, skipping the setup sentence that names the test method and the coefficient or exponent that goes with it.
What to do instead
Before calculating, underline the method named, the residual and static pressures, and the nozzle diameter; write the matching formula and exponent at the top of your scratch space, then substitute. Practice a mixed set where NFF and hydrant-flow items are interleaved so method selection, not arithmetic, is the skill trained.
Applying occupant-load or egress-width factors from the wrong occupancy chapter, or failing to separate gross floor area from net area before dividing by the load factor.
The stem gives dimensions and an occupancy name that sounds like a familiar classification, and candidates default to the factor they used most recently rather than the one tied to the actual use and the code edition cited.
What to do instead
Build a one-page occupancy matrix (use, load factor, egress width per person, common exceptions) and recite it before each practice block. In items, circle the stated use and the code edition, confirm area basis (gross vs. net), then compute; recheck by asking whether the resulting occupant load is plausible for the described space.
Reading a plan-review or inspection scenario as a compliance verdict instead of identifying the specific code section violated, the condition observed, and the corrective action requested.
Items are written as narratives, and candidates jump to 'pass/fail' judgments, missing that the credited response names a precise requirement and a remedy rather than a general opinion.
What to do instead
Use a fixed three-part answer frame: cite the requirement category, state the observed deficiency in measurable terms, and state the corrective action with a re-inspection trigger. Practice writing that frame for ten scenarios before answering multiple-choice versions, so the structure becomes automatic.
Confusing prescriptive requirements with alternative-method or performance-based approvals, and answering as though an engineered design satisfies prescriptive criteria automatically.
Both paths appear in the same scenarios, and candidates assume any approved design is compliant with every prescriptive clause rather than recognizing documented equivalency and the conditions attached to it.
What to do instead
For each scenario, label the path (prescriptive, alternative method, performance-based) before evaluating. Memorize what documentation each path requires and who approves it; drill items that ask which path a described design follows and what evidence must exist in the file.
Miscalculating required fire-flow or sprinkler demand by mixing units (gpm vs. L/min, psi vs. kPa, feet vs. meters) or by forgetting to convert a duration to the unit the answer choices use.
Stems often supply data in mixed units to mirror field documents, and candidates carry numbers forward without tracking the unit attached to each figure.
What to do instead
Annotate every number with its unit as you copy it, and write the target unit beside the answer blank. Do a dimensional check before selecting: if the result's unit does not match the question, the arithmetic is wrong regardless of how familiar the number looks.
Answering inspection and testing questions from memory of field practice rather than from the required frequency, test method, and acceptance criteria in the referenced standard.
Experienced candidates have seen many inspections and substitute habit for the documented interval or procedure, especially for hydrostatic tests, backflow assemblies, and alarm devices.
What to do instead
Maintain a frequency-and-criteria table (component, test, interval, acceptance threshold) and rebuild it from the standard text, not from memory, until it is stable. For each practice item, state the interval and threshold aloud before looking at the options.
Misreading the question's subject-answering who is responsible when asked who must be notified, or answering the inspection step when asked the documentation step.
Stems are dense with roles and sequence, and under time pressure candidates match a keyword in the option to a keyword in the stem without checking the interrogative.
What to do instead
Cover the options, read the stem twice, and write a one-line answer in your own words. Then uncover options and choose the closest match. If two options survive, the difference is usually the subject or the sequence, so compare them against your written line.
Treating a 'which is the FIRST action' or 'BEST action' item as a knowledge recall question instead of ranking the steps in correct sequence and choosing the earliest required step.
All listed actions may be legitimate, so candidates pick the most impressive or most thorough action rather than the one that must occur first or the one that best resolves the stated condition.
What to do instead
For sequence items, list the steps in order on scratch paper before reading options, then eliminate any option that occurs later than the required first step. For 'best' items, identify the criterion the stem implies (safety, code compliance, documentation) and rank by that criterion only.
Skipping the code-edition and effective-date cues in the stem and applying requirements from a different edition, or assuming a newer requirement applies retroactively to an existing condition.
Candidates study one edition and generalize, and they overlook that existing buildings and previously approved installations are often evaluated under the edition in force at the time of approval unless a specific trigger applies.
What to do instead
Circle every edition, date, and approval reference in the stem before answering. Keep a short list of triggers that require upgrade (change of use, substantial alteration, added occupancy load) and drill items that hinge on whether a trigger is present.
Leaving calculation and sequencing items blank or guessing early when time runs short, instead of using a two-pass strategy that banks the quick recall items first.
Calculation items consume disproportionate time, and candidates work them in order, leaving easy items unreached when the section closes.
What to do instead
On the first pass, answer every item you can resolve in under a minute and flag the rest. On the second pass, do flagged calculations with full scratch work. Practice under a timer with a target of two passes so the triage habit is rehearsed, not improvised on exam day.