- What the Nine Domain Headings Actually Are
- How the Two-Part Technical Exam Is Structured
- Domains 1-4: Ground, Earth, Site and Landscape
- Domains 5-6: Concrete and Masonry
- Domains 7-9: Steel, Light-Gage Framing and Wood
- Code References Behind the Domains
- Fees, Prerequisites and Registration Mechanics
- Sequencing the Nine Domains in Your Prep
- Frequently Asked Questions
- The nine domains are unweighted ACIA Division II Building subject headings, not nine verified weighted exam sections.
- Building testing has two technical parts: Codes & Standards (50 questions, three hours) and Plans & Specs (50 questions, four hours).
- Technical-exam fee is $600; the separate Administration & Fundamentals prerequisite adds $100 per attempt.
- Confirm code editions and the NEC reference entry with ACIA before buying any reference books.
What the Nine Domain Headings Actually Are
Searching for "RCI exam domains" tends to produce tidy percentage tables, and that is exactly where candidates get misled. For the Registered Construction Inspector in Building credential, issued by the American Construction Inspectors Association (ACIA) under its Division II Building scope, the nine content areas come from a technical-examination subject list in ACIA's instructions for applicants. That list is a legacy, explicitly nonexhaustive description of what Division II covers. It names nine headings. It does not assign weights to them.
That distinction shapes how you should study. You cannot budget "15% of your time on masonry" because no verified weighting exists. What you can do is treat each heading as a body of knowledge the inspector is expected to command, then check each against the current exam format, which is organized differently, as the next section explains. For a broader orientation to the credential itself, see What Is RCI Certification? and RCI Requirements 2026: Eligibility, Prerequisites & How to Qualify.
How the Two-Part Technical Exam Is Structured
The current exam source for Building lists two technical parts rather than nine domain-labeled sections:
| Exam Part | Questions | Time Allowed | What It Tests |
|---|---|---|---|
| Codes & Standards | 50 | Three hours | Code provisions and referenced standards applied to inspection situations |
| Plans & Specs | 50 | Four hours | Reading drawings and specifications and judging field work against them |
The two equal 50-question counts are not official 50% subject-domain weights. They describe how many items each part contains, not how much any of the nine domains contributes. A single concrete or steel topic can surface in either part, once as a code question and once as a drawing-or-specification question.
Also note that legacy open-book and older timing instructions do not override this current schedule. If you find an older document describing different timing, the two-part schedule above is what governs. For scheduling specifics, check RCI Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Why the Plans & Specs Part Deserves Respect
The Plans & Specs part gives you the longer window, four hours against three for Codes & Standards. The extra hour reflects the work involved: locating a detail, cross-referencing a specification requirement, and deciding whether described field conditions comply. Candidates who come from field backgrounds sometimes find code recall harder than drawing interpretation, and candidates from design backgrounds often find the reverse. Know which side you are.
Domains 1-4: Ground, Earth, Site and Landscape
The first four headings move from what is below the structure to what surrounds it. For a building inspector, they represent the work that happens before and around the building envelope, and it is easy to underestimate them because they feel less "codey" than concrete or steel.
Domain 1: Foundations (piling and caissons)
Deep foundation inspection is about verifying that what was designed is what actually went into the ground, because most of it can never be seen again once placed.
- Pile types, installation records and what a driving or installation log should show
- Caisson excavation, bearing verification and the sequence of inspection before concrete placement
- Tolerances for location and plumbness, and what to do when a pile or shaft is out of position
- Documentation discipline: continuous inspection records that match the approved plans
Domain 2: Earthworks (excavation and grading)
Earthwork inspection covers the preparation of the ground that everything else depends on.
- Excavation limits, subgrade conditions and recognizing unsuitable material
- Fill placement, lift thickness and compaction verification concepts
- Grading to drain and the relationship between finished grades and the structure
- Excavation safety awareness as it intersects with inspection access
Domain 3: Sitework (pavements; utilities; fencing)
Sitework is a three-part heading, and each part has its own inspection logic.
- Pavements: base preparation, material placement and finished-surface expectations
- Utilities: trench conditions, bedding, pipe installation and testing before backfill
- Fencing: layout, post installation and conformance to specification
Domain 4: Landscaping and irrigation
This is the heading candidates most often skip, and it is a mistake to do so. Because it is listed, it is fair game.
- Planting requirements, soil preparation and plant material conformance to specifications
- Irrigation system installation, coverage concepts and testing
- Drainage and grading interplay between planted areas and structures
Key Takeaway
Do not treat Domains 1-4 as a warm-up. Because the headings are unweighted, nothing tells you landscaping and irrigation will be tested lightly. Give each of the first four a pass through the actual specification language, not just the code text.
Domains 5-6: Concrete and Masonry
Concrete and masonry are the two material-specific domains where inspection responsibility is most hands-on. Both reward candidates who have stood on a placement or a wall and watched what goes wrong.
Domain 5: Concrete work (including cast-in-place; shotcrete; pre stressed; light-weight; architectural concrete)
The heading lists five concrete categories, which signals breadth. Expect the exam to treat concrete as more than ordinary cast-in-place.
- Cast-in-place: formwork, reinforcement placement and cover, placing, consolidation and curing
- Shotcrete: application method, rebound and the inspection points unique to sprayed placement
- Pre stressed: tensioning concepts, tendon handling and the safety and documentation implications
- Light-weight: how aggregate type changes behavior and what the specification will require
- Architectural concrete: finish expectations, mock-ups and consistency across placements
- Testing and sampling concepts that tie to ACI 318, which appears in the issuer's reference list
Domain 6: Masonry work (including brick; concrete block; veneer construction)
Masonry inspection blends material conformance with workmanship you can only judge during construction.
- Brick and concrete block: unit conformance, mortar, bond patterns and joint treatment
- Reinforcement and grouting in reinforced masonry, including when and how cells are filled
- Veneer construction: anchorage, flashing, weep provisions and the way a veneer attaches to its backup
- Moisture management details that determine whether a wall performs over time
These two domains are where a disciplined candidate gains ground, because the questions often turn on the correct sequence of inspection. Placing concrete you never inspected beforehand and grout you never witnessed filled are the kinds of lapses these domains are built to test. If you want to calibrate how much effort that implies, read How Hard Is the RCI Exam? Complete Difficulty Guide 2026.
Domains 7-9: Steel, Light-Gage Framing and Wood
The last three headings cover the framing systems. Together they span heavy structural steel, lighter cold-formed and joist-based systems, and wood, which is the dominant material in so much building work.
Domain 7: Structural steel framing systems (including high-rise construction)
Steel inspection centers on connections, welding and the erection sequence, with high-rise work adding scale and coordination demands.
- Bolted and welded connections, and what a complete inspection of each involves
- Welding requirements tied to AWS D1.1, which appears in the issuer's reference list
- Erection sequence, bracing during construction and plumbing up the frame
- High-rise considerations: tolerances accumulating over height and field-connection quality
Domain 8: Metal joists and decking light-gage steel framing
Appearing as one heading, this domain covers lighter steel systems that behave differently from the heavy frame.
- Joist seating, bridging and attachment to supports
- Metal deck: placement, side-lap and end fastening, and its role in the floor or roof system
- Light-gage steel framing: member sizes, connections and fastening requirements
- Why substitutions and field modifications in light systems need approval before they are made
Domain 9: Wood construction (including rough and finish carpentry; millwork; wood preservatives; diaphragm structures)
Wood construction is broad, running from structural framing to finish work.
- Rough carpentry: framing members, connections, nailing and fastening schedules
- Finish carpentry and millwork: installation quality and conformance to approved details
- Wood preservatives: where treated material is required and how that is verified
- Diaphragm structures: how floors, roofs and walls act together and why nailing patterns matter to lateral performance
Code References Behind the Domains
The issuer's current references list the 2018 IBC, IMC, IPC and IFC, plus a separate entry reading 2018 NEC, International Fuel & Gas Code, AWS D1.1 and ACI 318. That second entry is worded in a way that warrants a caution.
- Confirm the NEC entry with ACIA before purchasing, since the wording on the issuer's list is not unambiguous.
- Some references carry unspecified editions. Verify the exact edition before buying books, because a mismatch wastes money and can mislead your studying.
- Map each reference to the domains it serves: the IBC underlies nearly all nine, AWS D1.1 anchors Domain 7, and ACI 318 anchors Domain 5.
| Reference | Most Relevant Domains |
|---|---|
| 2018 IBC | Broad application across Domains 1-9 |
| ACI 318 | Domain 5 (Concrete work); also relevant to Domain 1 where concrete foundation elements are involved |
| AWS D1.1 | Domain 7 (Structural steel); relevant to Domain 8 where welding applies |
| IMC, IPC, IFC, International Fuel & Gas Code | Building-systems questions that touch Domain 3 utilities and general code content |
The table reflects topical fit, not an official crosswalk, since ACIA does not publish one. For a compact way to keep reference facts straight, see RCI Cheat Sheet 2026: One-Page Review of Must-Know Facts.
Fees, Prerequisites and Registration Mechanics
Understanding the cost and sequence prevents surprises. The technical exam fee is $600. A separate Administration & Fundamentals prerequisite costs $100 per attempt. Added together, the first-attempt subtotal is $700, which is simple arithmetic and excludes study materials or any other charges. A detailed breakdown is in RCI Certification Cost 2026: Complete Pricing Breakdown.
Registration links to the Everblue Exam Registration Portal. Initial successful registration includes three years of ACIA membership, and renewal follows every three years with 36 ACIA continuing-education units plus the applicable fee.
Where the Sources Disagree
Two inconsistencies are worth knowing about before you plan:
- Experience requirements: The onboarding page states four construction-industry years with resume and employer verification. The rules and regulations page instead sets high-school equivalence, good character and five years with committee-approved credits, retaining one relevant inspection year. Ask ACIA which standard applies to your application.
- Prerequisite exam details: The shared prerequisite page states one hour and 45 or 59 to pass, while the Administration & Fundamentals Exam Overview describes 60 questions. These conflict, so confirm directly rather than relying on either figure.
Key Takeaway
When ACIA's own pages disagree, email the association and keep the reply. Planning around a requirement that turns out to be the older version is a costly way to learn the rules changed.
For passing-standard questions beyond this prerequisite conflict, see RCI Passing Score 2026: Exactly What You Need to Pass.
Sequencing the Nine Domains in Your Prep
Since no verified weighting exists, the sensible approach is to sequence by dependency and by your own gaps rather than by guessed percentages. One compact way to lay it out:
Below grade and site (Domains 1-4)
- Work through foundations, earthworks, sitework and landscaping together because they share the ground-up logic
- Give extra time to whichever of these you have never inspected
Concrete and masonry (Domains 5-6)
- Pair concrete with ACI 318 and masonry with the IBC provisions
- Practice sequence-of-inspection questions
Steel and wood (Domains 7-9)
- Pair Domain 7 with AWS D1.1
- Treat light-gage framing and diaphragm behavior as their own review blocks
Two-part rehearsal
- Drill code recall for Codes & Standards under a three-hour clock
- Drill drawing and specification reading for Plans & Specs under a four-hour clock
Adjust the length to your background. A candidate with years in concrete work can compress Week 2 and spend it on wood or landscaping. A fuller planning approach lives in RCI Study Guide 2026: How to Pass on Your First Attempt, and you can test your recall against the nine headings with the RCI practice tests. If you want structured preparation beyond self-study, RCI Training covers the options.
Why the Credential Matters After You Pass
Candidates ask whether nine broad technical domains justify the effort. The honest answer depends on your employment path, and the career side is covered in RCI Jobs, RCI Salary Guide 2026: Complete Earnings Analysis and Is the RCI Certification Worth It? Complete ROI Analysis 2026. Pass-rate questions are addressed in RCI Pass Rate 2026: What the Data Shows. When you are ready to measure yourself against realistic material, start with the main practice test site.
Frequently Asked Questions
No verified weighting exists. The nine headings come from an unweighted, explicitly nonexhaustive legacy technical scope for ACIA Division II Building. The two 50-question exam parts are not official 50% domain weights either.
It has two parts: Codes & Standards with 50 questions in three hours, and Plans & Specs with 50 questions in four hours. The nine domains are subject areas that can appear across both parts rather than separate sections.
The technical exam fee is $600 and the Administration & Fundamentals prerequisite is $100 per attempt, giving a $700 first-attempt subtotal. That figure excludes study materials and any other charges.
Current references list the 2018 IBC, IMC, IPC and IFC, plus an issuer entry reading 2018 NEC, International Fuel & Gas Code, AWS D1.1 and ACI 318. Confirm the NEC entry and any unspecified editions with ACIA before purchasing.
Registration renews every three years and requires 36 ACIA continuing-education units plus the applicable fee. Initial successful registration includes three years of ACIA membership.