ICC R1 Residential Combination Inspector Practice Test
Build your confidence for ICC R1 Residential Combination Inspector. Practice the concepts, understand the answers, and strengthen your knowledge one question at a time.
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The ICC Residential Combination Inspector (R1) exam is a comprehensive certification assessment for building safety professionals who inspect one- and two-family dwellings and townhouses. This 49-question exam validates a candidate's competency across four critical inspection disciplines: Building, Electrical, Mechanical, and Plumbing, as defined by the International Residential Code (IRC). It is designed for municipal inspectors, private sector plan reviewers, construction supervisors, and professionals seeking to demonstrate broad, cross-disciplinary expertise in residential code enforcement. By passing this exam, candidates earn a nationally recognized credential that signifies their ability to perform all residential inspections, enhancing their authority, career mobility, and value to employers. The certification confirms a holistic understanding of how different building systems interact and must comply with the IRC as a unified whole.
Sample Questions
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During a rough plumbing inspection for a one-story dwelling with a vented attic and crawlspace, the owner-builder asks for approval before the next trade starts. The jurisdiction is using the 2024 IRC. You observe that several 2x10 floor joists have plumbing bored near the bearing end and one joist is notched on the tension side at midspan. The contractor argues that the holes are cleanly drilled, so the joists are not weakened. What is the best inspection decision?
During a insulation inspection for a two-story townhouse unit separated by a fire-resistance-rated wall, the plumbing contractor asks for approval before the next trade starts. The jurisdiction is using the 2024 IRC. You observe that final grading slopes toward the foundation at the rear patio, and downspout extensions discharge into the same low area. The contractor argues that landscaping is outside the scope of the building code inspection. What is the best inspection decision?
During a insulation inspection for a detached one-family dwelling with an attached garage, the plumbing contractor asks for approval before the next trade starts. The jurisdiction is using the 2023 NEC as used with the residential code. You observe that a shallow metal switch box contains two 12 AWG cables, pigtails, internal clamps, and a smart dimmer with a large yoke. The contractor argues that the cover plate fits, so box fill is acceptable. What is the best inspection decision?
During a insulation inspection for an accessory dwelling unit over a private garage, the owner-builder asks for approval before the next trade starts. The jurisdiction is using the 2024 IRC. You observe that a replacement water heater is installed on a system with a check valve at the meter, but no thermal expansion control is provided. The contractor argues that the T and P relief valve will handle any pressure increase. What is the best inspection decision?
During a reinspection inspection for a two-story townhouse unit separated by a fire-resistance-rated wall, the framing contractor asks for approval before the next trade starts. The jurisdiction is using the 2024 IRC. You observe that a lavatory trap arm runs past the allowed developed length before the vent takeoff, with the vent rolled below the trap weir. The contractor argues that the fixture drains quickly during a water test, so the vent location is acceptable. What is the best inspection decision?
Career Opportunities & Salary
Exam insights and study advice
In the real world, residential construction involves complex interactions between structural, electrical, mechanical, and plumbing systems. An inspector certified in only one trade may miss critical violations where these systems intersect, such as improper venting of a furnace, framing that compromises plumbing waste lines, or electrical clearances near plumbing fixtures. The R1 credential ensures an inspector can assess the entire dwelling as an integrated system, which is crucial for ensuring safety, habitability, and energy efficiency. This comprehensive skill set prevents costly callbacks, reduces jurisdictional delays, and, most importantly, protects the health and safety of homeowners by enforcing a complete code-compliant installation.