AZ ROC A (KA) Dual Engineering common mistakes
AZ ROC A (KA) Dual Engineering · Understand the traps and how to avoid them.
Failing to read the contract's dispute resolution clause and assuming litigation is the default; missing the required notice period for claims.
Candidates often rely on general construction knowledge and overlook that Arizona contracts frequently mandate mediation or arbitration before litigation, and have strict notice deadlines (e.g., 14 days) that, if missed, waive rights.
What to do instead
Memorize the standard AIA A201 and Arizona-specific statutes (e.g., A.R.S. § 12-1362 for mediation) and practice identifying notice periods and resolution steps in sample contract clauses.
Calculating cut and fill volumes without properly accounting for soil shrinkage and swell factors, leading to incorrect balance and import/export quantities.
Candidates use raw bank volumes and forget that excavated soil expands (swell) and compacted fill shrinks (shrinkage), which changes the net earthwork required.
What to do instead
Always apply the appropriate swell/shrink factors: for example, use 1.25 for common earth swell and 0.90 for compaction shrinkage, and practice with problems that require converting between bank, loose, and compacted volumes.
Ignoring the required concrete cover over reinforcing steel and misapplying the ACI 318 cover requirements for different exposure conditions.
Candidates often default to a single cover value (e.g., 2 inches) and forget that cover varies with member type, exposure class (e.g., earth-formed, weather-exposed), and bar size.
What to do instead
Study ACI 318 cover tables and practice identifying cover for footings, slabs, beams, and columns under different exposure conditions; remember that Arizona's soil conditions may require additional cover for sulfate resistance.
Selecting HVAC equipment based on square footage alone without performing a proper Manual J load calculation, leading to undersized or oversized systems.
Candidates use rules of thumb (e.g., 1 ton per 500 sq ft) and overlook factors like insulation, window area, orientation, and Arizona's extreme temperature differentials.
What to do instead
Learn the steps of a Manual J load calculation and practice with problems that include design temperatures, R-values, and infiltration rates; understand that oversizing causes humidity and efficiency problems.
Misunderstanding the difference between plumbing venting requirements and drain slope, and failing to size pipes correctly based on fixture units.
Candidates confuse the roles of vents and drains, and they often forget that fixture units must be converted to drain size using tables in the plumbing code (e.g., IPC or UPC).
What to do instead
Memorize fixture unit values for common fixtures and practice using the drainage and venting tables; remember that slope for horizontal drains is typically 1/4 inch per foot for pipes 2 inches and smaller.
Failing to account for weld shrinkage and distortion when specifying or inspecting welded steel connections, leading to dimensional errors.
Candidates focus on weld strength but overlook that welding introduces residual stresses and shrinkage that can distort members, especially in long welds or asymmetric joints.
What to do instead
Study welding sequence and distortion control techniques (e.g., backstep welding, balanced welding) and practice identifying when to require distortion control in specifications.
Taking off quantities from drawings without cross-referencing the specifications, resulting in missing items like special coatings, testing, or submittals.
Candidates focus on the visual drawings and overlook that specifications contain requirements that affect cost but are not shown graphically.
What to do instead
Practice a systematic takeoff process that includes a specification review checklist; for each CSI division, list items that may not appear on drawings (e.g., testing, commissioning, warranties).
Failing to recognize the difference between OSHA's Focused Inspection and a comprehensive inspection, and misunderstanding when a competent person is required.
Candidates often know general safety rules but miss the nuances of OSHA inspection priorities and the specific roles of a competent person in excavation, scaffolding, and fall protection.
What to do instead
Study OSHA's inspection scheduling and the definition of a competent person; practice scenarios where a competent person must inspect daily (e.g., excavations, scaffolds) and document the inspection.
Assuming that a building permit is not required for minor renovations or tenant improvements, leading to code violations and stop-work orders.
Candidates rely on common misconceptions that small projects are exempt, but the International Building Code and local amendments often require permits for any structural, electrical, mechanical, or plumbing work.
What to do instead
Review the permit requirements in the IBC and local Arizona amendments; remember that even minor work like replacing a water heater or adding a circuit typically requires a permit.
Overlooking the need for a Stormwater Pollution Prevention Plan (SWPPP) and failing to implement Best Management Practices (BMPs) on construction sites.
Candidates focus on the Clean Water Act but forget that Arizona requires an AZPDES permit for discharges, and that SWPPPs must be site-specific and updated with changes.
What to do instead
Study the EPA's Construction General Permit and Arizona's delegation; practice identifying which sites need an AZPDES permit and list common BMPs for erosion and sediment control.