Free ICC B2 Exam Flashcards

The IBC governs construction, alteration, and occupancy of most commercial and multi-family structures above the IRC threshold. Agricultural buildings, certain temporary structures, and detached one- and two-family dwellings follow other codes. Always confirm occupancy and height before applying IBC chapters.

Issues permits, conducts or oversees inspections, may approve modifications with technical justification, and issues certificate of occupancy when work complies. Cannot waive code requirements without a documented code-compliant alternative or appeal process.

Confirms building or portion meets code for intended occupancy after final inspection. Occupying without CO when required is a violation. Changes of occupancy or major alterations typically need new permits and may require a new CO.

Offices, professional services, outpatient clinics (non-ambulatory surgery), and civic administration. Distinguished from Group M (mercantile), which involves display and sale of goods to the public. Occupancy group drives egress, sprinkler, and height-area tables.

A-2 is food and drink consumption (restaurants, bars). A-3 is assembly without food focus (theaters, churches, lecture halls). Different occupant load factors and egress requirements apply. Misclassification affects capacity and exit counts.

R-1 is transient lodging (hotels, boarding houses). R-2 is long-term multifamily dwellings. IBC regulates R occupancies when they exceed IRC scope (typically more than two dwelling units or over three stories).

H occupancies involve manufacturing, storage, or use of hazardous materials exceeding allowable quantities. Stricter construction, egress, and fire protection apply. MSDS and control area limits determine classification.

Occupancy subsidiary to main occupancy by area, personnel, or hazard. May be classified separately for fire protection if exceeding 10% of floor area (rules vary by edition and main occupancy). Affects sprinkler and separation requirements.

Separated: fire-resistance-rated separation allows each portion to comply independently. Non-separated: most restrictive requirements apply to entire building. Choice impacts construction type, sprinklers, and egress design.

Furnace rooms, storage rooms, and similar low-occupancy spaces with higher hazard than main occupancy. Often require fire barriers or automatic fire extinguishing per IBC Table 509. Inspect separation and door ratings.

Type I and II are noncombustible; Type III exterior walls noncombustible with combustible interior; Type IV heavy timber; Type V wood frame. A/B suffixes indicate higher (A) vs lower (B) fire-resistance within the type. Table 601 lists minimum ratings.

Highest fire-resistance category: structural frame and bearing walls typically 3 hours, floor construction 2 hours, and roof per Table 601. Used for tall or high-hazard buildings where maximum fire resistance is required.

Least fire-resistant: wood frame with no required fire-resistance ratings for primary elements unless triggered by occupancy or size. Lowest allowable height and area in tabular values; sprinklers often increase limits.

IBC height and area tables include footnotes allowing one-story or 20-foot height increases (and area increases) when NFPA 13 sprinklers protect the building, subject to occupancy and construction type. Verify exact footnote for your edition.

Fire wall creates separate buildings for height and area calculations; extends through roof with structural collapse allowance on either side. Fire barrier subdivides a single building. Fire wall has highest rating and strict continuity requirements.

Fire walls usually require 2-4 hour fire-resistance depending on occupancy and construction type (see Table 706.4). Openings are restricted; parapets or extension above roof may be required. Misidentifying a barrier as a fire wall affects entire code analysis.

Fire barrier: 1-2 hour rated assemblies limiting smoke spread between sections (shaft enclosures, incidental uses). Fire partition: lower rating (often 1 hour) separating tenant spaces or dwelling units. Inspect continuity, protected openings, and penetrations.

Elevator, stair, and mechanical shafts enclosed with fire-resistance-rated walls continuous from fire-rated floor to underside of roof or floor above. Openings only at approved locations with rated doors. Penetrations must be firestopped.

Door assembly rating is typically three-quarters of wall rating (e.g., 90-minute door in 2-hour wall) per IBC tables. Label must be visible; self- or automatic-closing required in rated openings. Gaps and hardware affect listing.

Every penetration through rated assembly must be sealed with listed firestop system matching hourly rating and penetrating item (pipe, cable, duct). Unsealed openings void assembly rating. Inspect during rough-in before concealment.

Table 602 sets exterior bearing wall ratings based on fire separation distance and construction type. Closer to lot line generally requires higher ratings to limit exterior fire spread. Nonbearing exterior walls have separate columns.

Floor-ceiling or roof-ceiling assemblies carry fire-resistance ratings supporting occupancy separation and shaft continuity. Membrane penetrations (lights, diffusers) must use listed assemblies. Inspect from both sides when possible.

Exit access (path to exit), exit (protected enclosure or exterior door), and exit discharge (path to public way). Entire route must meet width, protection, and illumination requirements without passing through high-hazard areas.

IBC Table 1006.2.1 requires two exits when occupant load exceeds 49 for most occupancies (lower thresholds for some groups such as H and I). Additional exits required at higher loads (e.g., over 500 occupants).

Corridors serving occupant load of 50 or more typically require 44 inches minimum clear width (36 inches when load under 50), with exceptions for Group I-2 and other special occupancies. Measure clear width between finished surfaces.

Maximum riser 7 inches and minimum tread 11 inches (7/11 rule) for most stairs, with uniformity limits on variation between adjacent treads/risers. Winder and spiral stairs have separate tables. Impacts egress safety and trip hazard.

Minimum 32 inches clear width between door face and stop when door is open 90 degrees. Larger requirements apply to accessible routes and some occupancies. Projections into clear width are limited.

Common path: distance before two separate exit access paths diverge. Travel distance: total path to the nearest exit. Sprinklers often increase both limits. Dead-end corridor limits are separate and shorter.

Divide floor area by occupant load factor from Table 1004.5 (varies by use — e.g., office vs assembly seating). Unlisted uses default conservatively. Occupant load drives required exits, restroom counts, and plumbing fixtures.

Stair capacity uses 0.3 inch of width per occupant (0.2 inch for other egress components in many editions). Sum capacities of all exits on level must meet or exceed occupant load. Reductions apply when sprinklers present.

Internally or externally illuminated exit signs required at exits and along path where direction is not obvious. Must remain visible during power failure (battery or emergency circuit). Inspect legibility, mounting height, and arrow direction.

Sleeping rooms below grade and certain residential occupancies need compliant windows or doors for rescue. Minimum net clear opening, sill height, and dimensions per IBC Section 1031 (edition-specific). Not a substitute for primary exits in commercial floors.

IBC Section 903.2 lists occupancy-specific thresholds (area, stories, hazards) mandating automatic sprinklers. No single square-foot rule applies to all buildings — always match occupancy group and conditions to the correct subsection.

Group A, E, I, R-1, and others per Section 907 require fire alarm with manual detection and automatic detection where specified. Pull stations located along path of travel within prescribed distance. Inspect notification appliance coverage.

Class I: 2.5-inch hose connection for fire department. Class II: 1.5-inch hose for occupant use (less common now). Class III combines both. Required in buildings per height and area thresholds in Section 905.

Smoke control systems maintain pressure differentials or exhaust smoke from large volumes (atria, malls) per engineered design. Distinct from ordinary restroom exhaust. Inspect dampers, fans, and commissioning documentation.

Fire pump and related equipment in dedicated room with fire-rated enclosure when required. Direct exterior access preferred for fire department. Verify power supply (normal and alternate) and test header arrangements.

Commercial cooking requires Type I hood, grease duct, and automatic fire suppression interlocked with fuel and makeup air shutoff. Inspect nozzle coverage, fusible links, and access panels for duct cleaning.

NFPA 10 (referenced by IBC) limits travel distance to extinguisher (commonly 75 feet for Class A in commercial spaces). Extinguisher type and size must match hazard. Mounting height and signage inspected during final.

At least one accessible route from site arrival points to accessible entrances, floors, and covered elements. Must be 36 inches minimum width (32 at doors), pass through accessible entrances, and avoid protruding objects.

Van-accessible space needs 96-inch minimum width aisle (or shared aisle) and vertical clearance on access aisle. Signage with International Symbol of Accessibility and van designation. Count based on total parking per Table 1106.1.

Maximum 1:12 slope (8.33%) for ramps unless exceptions apply. Maximum rise per run limited (typically 30 inches before landing). Handrails required on both sides when rise exceeds 6 inches. Cross slope limited to 1:48.

60-inch diameter turning circle or T-turn clearance inside accessible toilet room. Lavatory, grab bars, toilet centerline, and door swing cannot encroach on clear floor space. Mirror bottom edge at 40 inches maximum above floor.

Objects mounted on walls cannot protrude more than 4 inches into circulation path between 27 and 80 inches above floor (cane detection zone). Protrusions cause hazards for visually impaired travelers.

At least 60% of public entrances must be accessible (minimum one per building in many cases). Primary entrance should be accessible unless equivalent facilitation documented. Inspect door hardware, threshold, and maneuvering clearance.

Variable load from occupancy and contents (people, furniture, equipment). IBC Table 1607.1 assigns minimum uniformly distributed live loads by use (e.g., office vs assembly). Inspector verifies design documents match occupancy.

ASCE 7 maps basic wind speed by location and risk category. IBC references ASCE 7 for structural design. Inspector confirms design wind speed and exposure category match site and building risk category.

Combines mapped seismic hazard, soil site class, and risk category of structure. Higher SDC requires more stringent detailing, bracing, and anchorage. Shown on construction documents; verify special inspections where triggered.

Chapter 17 mandates special inspection and testing for high-seismic systems, certain concrete and steel connections, piles, and other critical elements. Inspector checks continuous special inspection reports before covering work.

Verify footing depth, reinforcement, and bearing on approved soils report. Undercut unsuitable material and observe required compaction. Frost depth and groundwater protection must meet jurisdiction amendments to IBC Chapter 18.