ICC B1 Exam Prep: Free Study Guide and 30 Practice Questions
Start your ICC B1 exam prep with 30 original, unofficial practice questions: 13 code applications and 17 code-navigation exercises. Each question labels its IRC edition; this is focused practice, not a full-length mock exam.
B1-01. Code Administration · 2021 IRC · Code application
An addition remains within the IRC’s scope. No other provision requires changes to the existing house. Under 2021 IRC R102.7.1, which statement is correct?
- A. The addition automatically requires the entire existing house to meet every new-construction requirement.
- B. The addition is exempt from new-construction requirements because the house already exists.
- C. The addition must meet new-construction requirements, without automatically requiring the entire existing house to do so.
- D. Every residential addition must instead follow the International Existing Building Code.
Reveal answer for B1-01
Answer: C. The addition must meet new-construction requirements, without automatically requiring the entire existing house to do so.
Why: C separates the new work from the existing house. A ignores the stated limit on requiring existing work to comply; B wrongly exempts the addition. D treats every addition as a change outside the IRC’s scope. The work also cannot make the existing building less compliant, and the building with its addition must meet the IRC height limits.
Code: 2021 IRC R102.7.1
Sources: ICC 2021 IRC excerpt — PDF p. 2, 2021 code text R102.7.1.
Answer: C. The addition must meet new-construction requirements, without automatically requiring the entire existing house to do so.
Why: C separates the new work from the existing house. A ignores the stated limit on requiring existing work to comply; B wrongly exempts the addition. D treats every addition as a change outside the IRC’s scope. The work also cannot make the existing building less compliant, and the building with its addition must meet the IRC height limits.
Code: 2021 IRC R102.7.1
Sources: ICC 2021 IRC excerpt — PDF p. 2, 2021 code text R102.7.1.
Continue the practice set
Look up every answer, even the ones you think you know. The application questions use the particular edition shown; the navigation exercises test where to start looking, not whether a building complies. Each answer includes its source, so you can check the reasoning on this page without buying or signing up for anything.
Use your booked edition for your main study. An exercise labeled with the other edition is a reading example, not evidence that its rule applies to your exam. The seven study groups used here organize this resource; their question counts are not official exam weights.
Building Planning (3 questions)
B1-02. Building Planning · 2021 IRC · Code application
One building contains four attached single-family dwelling units. Each unit extends from foundation to roof and has a yard or public way on at least two sides. Under the 2021 IRC R202 definitions, how should the building and its units be described?
- A. Four townhouse buildings and no townhouse units.
- B. One townhouse unit containing four townhouse buildings.
- C. A townhouse only if it contains at least five dwelling units.
- D. One townhouse building containing four townhouse units.
Reveal answer for B1-02
Answer: D. One townhouse building containing four townhouse units.
Why: The definitions distinguish the building from its individual dwelling units. Four qualifying attached units meet the three-or-more threshold for the building. A and B reverse the terms; C invents a five-unit threshold. This is a classification question, not a check of every townhouse construction requirement.
Code: 2021 IRC R202
Sources: ICC 2021 IRC excerpt — PDF p. 6, R202, Townhouse and Townhouse Unit.
Answer: D. One townhouse building containing four townhouse units.
Why: The definitions distinguish the building from its individual dwelling units. Four qualifying attached units meet the three-or-more threshold for the building. A and B reverse the terms; C invents a five-unit threshold. This is a classification question, not a check of every townhouse construction requirement.
Code: 2021 IRC R202
Sources: ICC 2021 IRC excerpt — PDF p. 6, R202, Townhouse and Townhouse Unit.
B1-03. Building Planning · 2021 IRC and 2024 IRC · Code navigation
You need a starting section for an exterior-wall fire-resistance question, not footing design or siding installation. Which route fits in both IRC editions?
- A. R302, Fire-resistant construction
- B. R403, Footings
- C. R602, Wood framing
- D. R703, Exterior wall covering
Reveal answer for B1-03
Answer: A. R302, Fire-resistant construction
Why: R302 is the fire-resistant-construction starting point in both editions. B concerns the foundation, C the wall framing and D its covering. After finding R302, the actual wall question still requires the applicable table, conditions and exceptions; the heading alone does not establish a fire-resistance rating.
Code: 2021 IRC R302 · 2024 IRC R302
Sources: ICC 2021 IRC contents — PDF pp. 20–21, Chapter 3 and neighboring topic headings; ICC 2024 IRC contents — PDF pp. 19–20, Chapter 3 and neighboring topic headings.
Answer: A. R302, Fire-resistant construction
Why: R302 is the fire-resistant-construction starting point in both editions. B concerns the foundation, C the wall framing and D its covering. After finding R302, the actual wall question still requires the applicable table, conditions and exceptions; the heading alone does not establish a fire-resistance rating.
Code: 2021 IRC R302 · 2024 IRC R302
Sources: ICC 2021 IRC contents — PDF pp. 20–21, Chapter 3 and neighboring topic headings; ICC 2024 IRC contents — PDF pp. 19–20, Chapter 3 and neighboring topic headings.
B1-04. Building Planning · 2021 IRC and 2024 IRC · Code navigation
An old study note points to the general “Garages and Carports” heading in the 2021 IRC. Which 2021-to-2024 pair follows that heading correctly?
- A. R302 → R302
- B. R310 → R319
- C. R309 → R317
- D. R314 → R310
Reveal answer for B1-04
Answer: C. R309 → R317
Why: The general garage/carport heading moved from R309 to R317. A is the fire-resistant-construction route, B follows emergency escape and rescue openings, and D follows smoke alarms. A garage separation or door question may lead to R302; do not confuse that specific fire-safety question with the general garage heading.
Code: 2021 IRC R309 · 2024 IRC R317
Sources: ICC 2021 IRC contents — PDF p. 20, Chapter 3; ICC 2024 IRC relocation table — PDF p. 15, printed p. 14.
Answer: C. R309 → R317
Why: The general garage/carport heading moved from R309 to R317. A is the fire-resistant-construction route, B follows emergency escape and rescue openings, and D follows smoke alarms. A garage separation or door question may lead to R302; do not confuse that specific fire-safety question with the general garage heading.
Code: 2021 IRC R309 · 2024 IRC R317
Sources: ICC 2021 IRC contents — PDF p. 20, Chapter 3; ICC 2024 IRC relocation table — PDF p. 15, printed p. 14.
Footings and Foundations (5 questions)
B1-05. Footings and Foundations · 2024 IRC · Code application
Under the footing-support provision in 2024 IRC R403.1, which pair identifies the permitted soil-support conditions?
- A. Undisturbed natural soil or engineered fill.
- B. Undisturbed natural soil only; engineered fill is never permitted.
- C. Any loose fill, provided that the footing is concrete.
- D. Any existing fill, provided that the house is one story.
Reveal answer for B1-05
Answer: A. Undisturbed natural soil or engineered fill.
Why: A includes both soil-support conditions stated in R403.1. B excludes an expressly permitted option. C and D substitute unverified fill for the required support. This answers the support-condition question only, not footing width, depth, load capacity or frost protection.
Code: 2024 IRC R403.1
Sources: ICC 2024 IRC excerpt — PDF p. 5, printed p. 97, R403.1, actual code text.
Answer: A. Undisturbed natural soil or engineered fill.
Why: A includes both soil-support conditions stated in R403.1. B excludes an expressly permitted option. C and D substitute unverified fill for the required support. This answers the support-condition question only, not footing width, depth, load capacity or frost protection.
Code: 2024 IRC R403.1
Sources: ICC 2024 IRC excerpt — PDF p. 5, printed p. 97, R403.1, actual code text.
B1-06. Footings and Foundations · 2024 IRC · Code application
A concrete stem-wall configuration covered by 2024 IRC Figure R403.1(1) is in seismic design category B and supports 4 ft 3 in of unbalanced backfill. What does the figure’s more-than-48-inch note require?
- A. No base restraint, because the backfill is less than 5 ft.
- B. No base restraint, because 4 ft 3 in is only 4.3 in.
- C. Restraint only at the roof, with no condition at the wall base.
- D. Lateral restraint at the wall base in accordance with R404.1.3.2.
Reveal answer for B1-06
Answer: D. Lateral restraint at the wall base in accordance with R404.1.3.2.
Why: The backfill is 51 inches, so it exceeds the figure’s 48-inch trigger. A substitutes a five-foot threshold; B mixes units; C changes the restraint location. The figure directs the reader to R404.1.3.2; this exercise does not size or design the restraint.
Math: (4 × 12) + 3 = 51 in; 51 in > 48 in
Code: 2024 IRC Figure R403.1(1); cross-reference R404.1.3.2
Sources: ICC 2024 IRC excerpt — PDF p. 5, printed p. 97, Figure R403.1(1), SDC A, B and C excerpt, base-restraint note.
Answer: D. Lateral restraint at the wall base in accordance with R404.1.3.2.
Why: The backfill is 51 inches, so it exceeds the figure’s 48-inch trigger. A substitutes a five-foot threshold; B mixes units; C changes the restraint location. The figure directs the reader to R404.1.3.2; this exercise does not size or design the restraint.
Math: (4 × 12) + 3 = 51 in; 51 in > 48 in
Code: 2024 IRC Figure R403.1(1); cross-reference R404.1.3.2
Sources: ICC 2024 IRC excerpt — PDF p. 5, printed p. 97, Figure R403.1(1), SDC A, B and C excerpt, base-restraint note.
B1-07. Footings and Foundations · 2024 IRC · Code application
A site is in seismic design category C, and soil testing is being performed. Under 2024 IRC R401.4, which information must the geotechnical report include?
- A. Site class only.
- B. Short-period spectral response acceleration, S_DS, only.
- C. Both site class and short-period spectral response acceleration, S_DS.
- D. Neither; the requirement starts only at seismic design category D.
Reveal answer for B1-07
Answer: C. Both site class and short-period spectral response acceleration, S_DS.
Why: The stated seismic-category and soil-testing conditions are both present. A and B each omit one required component. D incorrectly excludes category C. The rule does not say that every residential site must have a soil test.
Code: 2024 IRC R401.4
Sources: ICC 2024 IRC excerpt — PDF p. 3, printed p. 95, R401.4, actual code text.
Answer: C. Both site class and short-period spectral response acceleration, S_DS.
Why: The stated seismic-category and soil-testing conditions are both present. A and B each omit one required component. D incorrectly excludes category C. The rule does not say that every residential site must have a soil test.
Code: 2024 IRC R401.4
Sources: ICC 2024 IRC excerpt — PDF p. 3, printed p. 95, R401.4, actual code text.
B1-08. Footings and Foundations · 2021 IRC and 2024 IRC · Code navigation
You have located footings in R403, but the question asks about a foundation wall. Which neighboring section is the closer starting point in both editions?
- A. R403, Footings
- B. R405, Foundation drainage
- C. R407, Columns
- D. R404, Foundation and retaining walls
Reveal answer for B1-08
Answer: D. R404, Foundation and retaining walls
Why: R404 addresses the wall topic. A keeps you at the footing rather than the wall; B shifts to drainage; C shifts to columns. Being in the right chapter is not the same as finding the requested subject.
Code: 2021 IRC R404 · 2024 IRC R404
Sources: ICC 2021 IRC contents — PDF pp. 20–21, Chapter 4 and neighboring topic headings; ICC 2024 IRC contents — PDF pp. 19–20, Chapter 4 and neighboring topic headings.
Answer: D. R404, Foundation and retaining walls
Why: R404 addresses the wall topic. A keeps you at the footing rather than the wall; B shifts to drainage; C shifts to columns. Being in the right chapter is not the same as finding the requested subject.
Code: 2021 IRC R404 · 2024 IRC R404
Sources: ICC 2021 IRC contents — PDF pp. 20–21, Chapter 4 and neighboring topic headings; ICC 2024 IRC contents — PDF pp. 19–20, Chapter 4 and neighboring topic headings.
B1-09. Footings and Foundations · 2021 IRC and 2024 IRC · Code navigation
You need to compare foundation dampproofing with waterproofing. Which section should you open first in either edition?
- A. R406
- B. R404
- C. R405
- D. R408
Reveal answer for B1-09
Answer: A. R406
Why: R406 is the dampproofing-and-waterproofing section. R404 covers foundation and retaining walls, R405 foundation drainage, and R408 under-floor space. The location is not a rule that every wall needs the same treatment: read the applicable provision and its conditions before deciding.
Code: 2021 IRC R406 · 2024 IRC R406
Sources: ICC 2021 IRC contents — PDF pp. 20–21, Chapter 4 and neighboring topic headings; ICC 2024 IRC contents — PDF pp. 19–20, Chapter 4 and neighboring topic headings.
Answer: A. R406
Why: R406 is the dampproofing-and-waterproofing section. R404 covers foundation and retaining walls, R405 foundation drainage, and R408 under-floor space. The location is not a rule that every wall needs the same treatment: read the applicable provision and its conditions before deciding.
Code: 2021 IRC R406 · 2024 IRC R406
Sources: ICC 2021 IRC contents — PDF pp. 20–21, Chapter 4 and neighboring topic headings; ICC 2024 IRC contents — PDF pp. 19–20, Chapter 4 and neighboring topic headings.
Floor Construction (4 questions)
B1-10. Floor Construction · 2021 IRC · Code application
A sawn-lumber 2×10 floor joist is 9¼ in deep. It is notched on the bottom edge in the outer third of the span, away from the support. Considering the depth limit only under the 2021 IRC, which listed notch depth is the largest permitted?
- A. ¾ in
- B. 1½ in
- C. 2⁵⁄₁₆ in
- D. 3 in
Reveal answer for B1-10
Answer: B. 1½ in
Why: Notches can’t be deeper than one-sixth of the joist depth: 9.25 ÷ 6 ≈ 1.54 in, so 1½ in is the largest listed allowed value. A is smaller. No notches are allowed in the middle third of the span. One-quarter of the depth (C, 2⁵⁄₁₆ in) applies to end notches, not this location. The 3-in choice (D) exceeds the notch-depth limit; bored holes have a different limit. Notch length and the other cutting conditions still need checking.
Math: 9.25 in ÷ 6 ≈ 1.5417 in; 1½ in = 1.5 in
Code: 2021 IRC R502.8.1
Sources: ICC CodeNotes: Cutting, Drilling and Notching — 2021 IRC basis; Figure 1 and accompanying text; ICC CodeNotes Figure 1 — Figure 1, dimension labels and notes.
Answer: B. 1½ in
Why: Notches can’t be deeper than one-sixth of the joist depth: 9.25 ÷ 6 ≈ 1.54 in, so 1½ in is the largest listed allowed value. A is smaller. No notches are allowed in the middle third of the span. One-quarter of the depth (C, 2⁵⁄₁₆ in) applies to end notches, not this location. The 3-in choice (D) exceeds the notch-depth limit; bored holes have a different limit. Notch length and the other cutting conditions still need checking.
Math: 9.25 in ÷ 6 ≈ 1.5417 in; 1½ in = 1.5 in
Code: 2021 IRC R502.8.1
Sources: ICC CodeNotes: Cutting, Drilling and Notching — 2021 IRC basis; Figure 1 and accompanying text; ICC CodeNotes Figure 1 — Figure 1, dimension labels and notes.
B1-11. Floor Construction · 2021 IRC · Code application
A 3-in hole is bored through a sawn-lumber 2×12 floor joist that is 11¼ in deep. The edge of the hole is 1½ in from the bottom of the joist. What is the problem?
- A. There is none; holes up to one-third of the depth are allowed
- B. The hole is closer than 2 in to the bottom edge
- C. Holes are never allowed in floor joists
- D. The hole is larger than one-quarter of the depth
Reveal answer for B1-11
Answer: B. The hole is closer than 2 in to the bottom edge
Why: Holes can be up to one-third of the joist depth, which is 3¾ in here, so a 3-in hole is a legal size. But a hole must also stay at least 2 in from the top and bottom edges, and this one is only 1½ in away. Option A ignores the edge-distance rule, and one-quarter (D) isn't the hole limit. C is also wrong: properly located holes within the limits are permitted in sawn lumber.
Math: 11.25 in ÷ 3 = 3.75 in
Code: 2021 IRC R502.8.1
Sources: ICC CodeNotes: Cutting, Drilling and Notching — 2021 IRC basis; Figure 1 and accompanying text; ICC CodeNotes Figure 1 — Figure 1, dimension labels and notes.
Answer: B. The hole is closer than 2 in to the bottom edge
Why: Holes can be up to one-third of the joist depth, which is 3¾ in here, so a 3-in hole is a legal size. But a hole must also stay at least 2 in from the top and bottom edges, and this one is only 1½ in away. Option A ignores the edge-distance rule, and one-quarter (D) isn't the hole limit. C is also wrong: properly located holes within the limits are permitted in sawn lumber.
Math: 11.25 in ÷ 3 = 3.75 in
Code: 2021 IRC R502.8.1
Sources: ICC CodeNotes: Cutting, Drilling and Notching — 2021 IRC basis; Figure 1 and accompanying text; ICC CodeNotes Figure 1 — Figure 1, dimension labels and notes.
B1-12. Floor Construction · 2021 IRC and 2024 IRC · Code navigation
A floor question is actually about the under-floor crawl space. Which section is the starting point in both editions, even though it is in Chapter 4 rather than Chapter 5?
- A. R502
- B. R506
- C. R408
- D. R806
Reveal answer for B1-12
Answer: C. R408
Why: R408 is Under-Floor Space. A is wood floor framing, B is concrete floors on ground, and D is roof ventilation. Search for the space or system in the question rather than assuming every floor-related topic is in Chapter 5.
Code: 2021 IRC R408 · 2024 IRC R408
Sources: ICC 2021 IRC contents — PDF pp. 20–21, Chapter 4 and neighboring topic headings; ICC 2024 IRC contents — PDF pp. 19–20, Chapter 4 and neighboring topic headings.
Answer: C. R408
Why: R408 is Under-Floor Space. A is wood floor framing, B is concrete floors on ground, and D is roof ventilation. Search for the space or system in the question rather than assuming every floor-related topic is in Chapter 5.
Code: 2021 IRC R408 · 2024 IRC R408
Sources: ICC 2021 IRC contents — PDF pp. 20–21, Chapter 4 and neighboring topic headings; ICC 2024 IRC contents — PDF pp. 19–20, Chapter 4 and neighboring topic headings.
B1-13. Floor Construction · 2021 IRC and 2024 IRC · Code navigation
You need the dedicated exterior-deck section, rather than stopping at the general wood-floor heading. Which route fits in both editions?
- A. R502
- B. R503
- C. R506
- D. R507
Reveal answer for B1-13
Answer: D. R507
Why: R507 is the deck-specific starting point. R502 covers wood floor framing, R503 floor sheathing, and R506 concrete floors on ground. A deck question can also contain cross-references, so finding its dedicated section starts the lookup rather than finishing every design check.
Code: 2021 IRC R507 · 2024 IRC R507
Sources: ICC 2021 IRC contents — PDF pp. 20–21, Chapter 5 and neighboring topic headings; ICC 2024 IRC contents — PDF pp. 19–20, Chapter 5 and neighboring topic headings.
Answer: D. R507
Why: R507 is the deck-specific starting point. R502 covers wood floor framing, R503 floor sheathing, and R506 concrete floors on ground. A deck question can also contain cross-references, so finding its dedicated section starts the lookup rather than finishing every design check.
Code: 2021 IRC R507 · 2024 IRC R507
Sources: ICC 2021 IRC contents — PDF pp. 20–21, Chapter 5 and neighboring topic headings; ICC 2024 IRC contents — PDF pp. 19–20, Chapter 5 and neighboring topic headings.
Wall Construction and Coverings (8 questions)
B1-14. Wall Construction and Coverings · 2021 IRC · Code application
Use the ordinary wood-stud provisions, with no approved stud shoe or engineered alternative. An exterior bearing wall is framed with 2×4 studs, which are 3½ in deep. What is the deepest notch allowed in one of those studs?
- A. ⅞ in
- B. 1⅜ in
- C. 2⅛ in
- D. ½ in
Reveal answer for B1-14
Answer: A. ⅞ in
Why: Studs in exterior or bearing walls can be notched up to 25 percent of their depth: 3.5 × 0.25 = 0.875 in, or ⅞ in. The 40 percent limit is for nonbearing walls only; B exceeds the bearing-wall limit even though it is slightly below 40 percent of 3½ in. C is also too deep, while D is permitted but is not the deepest listed notch.
Math: 3.5 in × 0.25 = 0.875 in
Code: 2021 IRC R602.6
Sources: ICC CodeNotes: Cutting, Drilling and Notching — 2021 IRC basis; Figure 2 and accompanying text; ICC CodeNotes Figure 2 — Figure 2, dimension labels and notes.
Answer: A. ⅞ in
Why: Studs in exterior or bearing walls can be notched up to 25 percent of their depth: 3.5 × 0.25 = 0.875 in, or ⅞ in. The 40 percent limit is for nonbearing walls only; B exceeds the bearing-wall limit even though it is slightly below 40 percent of 3½ in. C is also too deep, while D is permitted but is not the deepest listed notch.
Math: 3.5 in × 0.25 = 0.875 in
Code: 2021 IRC R602.6
Sources: ICC CodeNotes: Cutting, Drilling and Notching — 2021 IRC basis; Figure 2 and accompanying text; ICC CodeNotes Figure 2 — Figure 2, dimension labels and notes.
B1-15. Wall Construction and Coverings · 2021 IRC · Code application
Use the ordinary wood-stud provisions, with no approved stud shoe or engineered alternative. In a nonbearing interior wall framed with 2×4 studs (3½ in deep), what is the largest hole that can be bored through a single stud?
- A. 1.4 in
- B. 2.1 in
- C. 2.8 in
- D. 0.875 in
Reveal answer for B1-15
Answer: B. 2.1 in
Why: Bored holes can be up to 60 percent of the stud's depth: 3.5 × 0.6 = 2.1 in. The edge of the hole must also stay at least ⅝ in from the edge of the stud. 1.4 in (A) is the 40 percent figure that applies to single studs in bearing walls. C is 80 percent and too large. D is the 25-percent bearing-wall notch calculation, not this hole-diameter limit.
Math: 3.5 in × 0.6 = 2.1 in
Code: 2021 IRC R602.6
Sources: ICC CodeNotes: Cutting, Drilling and Notching — 2021 IRC basis; Figure 3 and accompanying text; ICC CodeNotes Figure 3 — Figure 3, dimension labels and notes.
Answer: B. 2.1 in
Why: Bored holes can be up to 60 percent of the stud's depth: 3.5 × 0.6 = 2.1 in. The edge of the hole must also stay at least ⅝ in from the edge of the stud. 1.4 in (A) is the 40 percent figure that applies to single studs in bearing walls. C is 80 percent and too large. D is the 25-percent bearing-wall notch calculation, not this hole-diameter limit.
Math: 3.5 in × 0.6 = 2.1 in
Code: 2021 IRC R602.6
Sources: ICC CodeNotes: Cutting, Drilling and Notching — 2021 IRC basis; Figure 3 and accompanying text; ICC CodeNotes Figure 3 — Figure 3, dimension labels and notes.
B1-16. Wall Construction and Coverings · 2021 IRC · Code application
A plumber needs to bore a hole equal to 50 percent of the stud depth through a single stud in an exterior bearing wall. No approved stud shoe or engineered alternative is being used. Under the ordinary 2021 IRC stud-boring provisions, what additional requirement applies?
- A. Nothing extra; the hole is allowed as is
- B. The stud must be doubled, and no more than two doubled studs in a row may be bored this way
- C. The hole is not allowed under any circumstances
- D. A steel protection plate is the only requirement
Reveal answer for B1-16
Answer: B. The stud must be doubled, and no more than two doubled studs in a row may be bored this way
Why: In exterior and bearing walls, the ordinary single-stud hole limit is 40 percent of the stud depth. For a hole over 40 percent and up to 60 percent, the illustrated prescriptive route requires doubling, with no more than two successive doubled studs bored. A ignores that limit, C ignores the doubling route, and a steel plate (D) does not substitute for it. Approved stud shoes have a separate exception; they are excluded from this question.
Code: 2021 IRC R602.6 and its stud-shoe exception
Sources: ICC CodeNotes: Cutting, Drilling and Notching — 2021 IRC basis; Figure 2 and accompanying text; ICC CodeNotes Figure 2 — Figure 2, dimension labels and notes.
Answer: B. The stud must be doubled, and no more than two doubled studs in a row may be bored this way
Why: In exterior and bearing walls, the ordinary single-stud hole limit is 40 percent of the stud depth. For a hole over 40 percent and up to 60 percent, the illustrated prescriptive route requires doubling, with no more than two successive doubled studs bored. A ignores that limit, C ignores the doubling route, and a steel plate (D) does not substitute for it. Approved stud shoes have a separate exception; they are excluded from this question.
Code: 2021 IRC R602.6 and its stud-shoe exception
Sources: ICC CodeNotes: Cutting, Drilling and Notching — 2021 IRC basis; Figure 2 and accompanying text; ICC CodeNotes Figure 2 — Figure 2, dimension labels and notes.
B1-17. Wall Construction and Coverings · 2021 IRC · Code application
Use the ordinary wood-stud provisions, with no approved stud shoe or engineered alternative. A 1-in hole through a 2×4 stud (3½ in deep) has its edge ½ in from the nearest edge of the stud. Does it meet the hole-size and edge-distance limits?
- A. Yes, because the hole is under 40 percent of the stud depth
- B. No, the edge of the hole must be at least ⅝ in from the edge of the stud
- C. Yes, because edge distance only applies to notches
- D. No, holes must be centered in the stud
Reveal answer for B1-17
Answer: B. No, the edge of the hole must be at least ⅝ in from the edge of the stud
Why: The hole is a legal size, but R602.6 also requires the edge of a bored hole to be at least ⅝ in from the edge of the stud. The size limit alone (A) doesn't settle it. The code doesn't require holes to be centered (D). C is wrong because the edge-distance limit applies to bored holes.
Code: 2021 IRC R602.6
Sources: ICC CodeNotes: Cutting, Drilling and Notching — 2021 IRC basis; Figure 2 and accompanying text; ICC CodeNotes Figure 2 — Figure 2, dimension labels and notes.
Answer: B. No, the edge of the hole must be at least ⅝ in from the edge of the stud
Why: The hole is a legal size, but R602.6 also requires the edge of a bored hole to be at least ⅝ in from the edge of the stud. The size limit alone (A) doesn't settle it. The code doesn't require holes to be centered (D). C is wrong because the edge-distance limit applies to bored holes.
Code: 2021 IRC R602.6
Sources: ICC CodeNotes: Cutting, Drilling and Notching — 2021 IRC basis; Figure 2 and accompanying text; ICC CodeNotes Figure 2 — Figure 2, dimension labels and notes.
B1-18. Wall Construction and Coverings · 2021 IRC · Code application
Use the ordinary wood-stud provisions, with no approved stud shoe or engineered alternative. A stud has both a notch and a bored hole at the same cross section. Each one is within its own size limit. Is that allowed?
- A. Yes, because each one is within its limit
- B. No, a bored hole can't be in the same section of stud as a cut or notch
- C. Yes, but only in nonbearing walls
- D. Yes, if a steel plate is added
Reveal answer for B1-18
Answer: B. No, a bored hole can't be in the same section of stud as a cut or notch
Why: R602.6 doesn't allow a bored hole in the same section of stud as a cut or notch, even when each would be fine alone. This rule applies to bearing and nonbearing walls alike, so C and D don't fix it.
Code: 2021 IRC R602.6
Sources: ICC CodeNotes: Cutting, Drilling and Notching — 2021 IRC basis; Figure 3 and accompanying text; ICC CodeNotes Figure 3 — Figure 3, dimension labels and notes.
Answer: B. No, a bored hole can't be in the same section of stud as a cut or notch
Why: R602.6 doesn't allow a bored hole in the same section of stud as a cut or notch, even when each would be fine alone. This rule applies to bearing and nonbearing walls alike, so C and D don't fix it.
Code: 2021 IRC R602.6
Sources: ICC CodeNotes: Cutting, Drilling and Notching — 2021 IRC basis; Figure 3 and accompanying text; ICC CodeNotes Figure 3 — Figure 3, dimension labels and notes.
B1-19. Wall Construction and Coverings · 2021 IRC and 2024 IRC · Code navigation
The question concerns an interior wall covering, not the wood studs behind it. Which section is the closer starting point in both editions?
- A. R702
- B. R602
- C. R703
- D. R905
Reveal answer for B1-19
Answer: A. R702
Why: R702 covers interior coverings. B is the wood-framing route, C is exterior wall covering, and D concerns roof coverings. Identifying which layer of the assembly the question asks about avoids applying a framing rule to a finish.
Code: 2021 IRC R702 · 2024 IRC R702
Sources: ICC 2021 IRC contents — PDF pp. 20–21, Chapter 7 and neighboring topic headings; ICC 2024 IRC contents — PDF pp. 19–20, Chapter 7 and neighboring topic headings.
Answer: A. R702
Why: R702 covers interior coverings. B is the wood-framing route, C is exterior wall covering, and D concerns roof coverings. Identifying which layer of the assembly the question asks about avoids applying a framing rule to a finish.
Code: 2021 IRC R702 · 2024 IRC R702
Sources: ICC 2021 IRC contents — PDF pp. 20–21, Chapter 7 and neighboring topic headings; ICC 2024 IRC contents — PDF pp. 19–20, Chapter 7 and neighboring topic headings.
B1-20. Wall Construction and Coverings · 2021 IRC and 2024 IRC · Code navigation
Your 2021 note sends you to R317 for protection of wood against decay. Which pair correctly updates that route for the 2024 IRC?
- A. R302 → R302
- B. R304 → R312
- C. R317 → R304
- D. R305 → R313
Reveal answer for B1-20
Answer: C. R317 → R304
Why: Wood-decay protection moved from R317 to R304. A is fire-resistant construction, B follows minimum room areas, and D follows ceiling height. Carry the edition with the section number: R304 does not identify the same topic in the two books.
Code: 2021 IRC R317 · 2024 IRC R304
Sources: ICC 2021 IRC contents — PDF p. 20, Chapter 3; ICC 2024 IRC relocation table — PDF p. 15, printed p. 14.
Answer: C. R317 → R304
Why: Wood-decay protection moved from R317 to R304. A is fire-resistant construction, B follows minimum room areas, and D follows ceiling height. Carry the edition with the section number: R304 does not identify the same topic in the two books.
Code: 2021 IRC R317 · 2024 IRC R304
Sources: ICC 2021 IRC contents — PDF p. 20, Chapter 3; ICC 2024 IRC relocation table — PDF p. 15, printed p. 14.
B1-21. Wall Construction and Coverings · 2021 IRC and 2024 IRC · Code navigation
You are looking up exterior siding or cladding rather than structural wall framing. Which section is the appropriate starting point in both editions?
- A. R602
- B. R702
- C. R905
- D. R703
Reveal answer for B1-21
Answer: D. R703
Why: R703 is the exterior-wall-covering route. A concerns wood framing, B interior covering, and C roof coverings. A wall may contain all kinds of materials, but the question’s requested layer determines the first useful heading.
Code: 2021 IRC R703 · 2024 IRC R703
Sources: ICC 2021 IRC contents — PDF pp. 20–21, Chapter 7 and neighboring topic headings; ICC 2024 IRC contents — PDF pp. 19–20, Chapter 7 and neighboring topic headings.
Answer: D. R703
Why: R703 is the exterior-wall-covering route. A concerns wood framing, B interior covering, and C roof coverings. A wall may contain all kinds of materials, but the question’s requested layer determines the first useful heading.
Code: 2021 IRC R703 · 2024 IRC R703
Sources: ICC 2021 IRC contents — PDF pp. 20–21, Chapter 7 and neighboring topic headings; ICC 2024 IRC contents — PDF pp. 19–20, Chapter 7 and neighboring topic headings.
Roof/Ceiling Construction (4 questions)
B1-22. Roof/Ceiling Construction · 2021 IRC and 2024 IRC · Code navigation
A question asks about ventilation of the attic or enclosed roof space. Which section is the starting point in both editions?
- A. R806
- B. R807
- C. R905
- D. R908
Reveal answer for B1-22
Answer: A. R806
Why: R806 is Roof Ventilation. R807 concerns attic access, R905 roof coverings, and R908 reroofing. Do not use an access-opening requirement as though it were a ventilation-area rule.
Code: 2021 IRC R806 · 2024 IRC R806
Sources: ICC 2021 IRC contents — PDF pp. 20–21, Chapter 8 and neighboring topic headings; ICC 2024 IRC contents — PDF pp. 19–20, Chapter 8 and neighboring topic headings.
Answer: A. R806
Why: R806 is Roof Ventilation. R807 concerns attic access, R905 roof coverings, and R908 reroofing. Do not use an access-opening requirement as though it were a ventilation-area rule.
Code: 2021 IRC R806 · 2024 IRC R806
Sources: ICC 2021 IRC contents — PDF pp. 20–21, Chapter 8 and neighboring topic headings; ICC 2024 IRC contents — PDF pp. 19–20, Chapter 8 and neighboring topic headings.
B1-23. Roof/Ceiling Construction · 2021 IRC and 2024 IRC · Code navigation
You need to find attic-access provisions, not crawl-space access or roof ventilation. Where should you start in either edition?
- A. R408
- B. R806
- C. R807
- D. R1004
Reveal answer for B1-23
Answer: C. R807
Why: R807 is Attic Access. R408 concerns under-floor space, R806 roof ventilation, and R1004 factory-built fireplaces. The similar word “access” does not make under-floor and attic rules interchangeable.
Code: 2021 IRC R807 · 2024 IRC R807
Sources: ICC 2021 IRC contents — PDF pp. 20–21, Chapter 8 and neighboring topic headings; ICC 2024 IRC contents — PDF pp. 19–20, Chapter 8 and neighboring topic headings.
Answer: C. R807
Why: R807 is Attic Access. R408 concerns under-floor space, R806 roof ventilation, and R1004 factory-built fireplaces. The similar word “access” does not make under-floor and attic rules interchangeable.
Code: 2021 IRC R807 · 2024 IRC R807
Sources: ICC 2021 IRC contents — PDF pp. 20–21, Chapter 8 and neighboring topic headings; ICC 2024 IRC contents — PDF pp. 19–20, Chapter 8 and neighboring topic headings.
B1-24. Roof/Ceiling Construction · 2021 IRC and 2024 IRC · Code navigation
You are checking a requirement for the roof-covering material, such as asphalt shingles, rather than the rafters or roof sheathing. Which section should you open first in both editions?
- A. R802
- B. R803
- C. R806
- D. R905
Reveal answer for B1-24
Answer: D. R905
Why: R905 is the roof-coverings section. R802 concerns wood roof framing, R803 roof sheathing, and R806 ventilation. After locating the covering provisions, select the specific material and read its conditions; this question does not establish a slope or underlayment requirement.
Code: 2021 IRC R905 · 2024 IRC R905
Sources: ICC 2021 IRC contents — PDF pp. 20–21, Chapter 9 and neighboring topic headings; ICC 2024 IRC contents — PDF pp. 19–20, Chapter 9 and neighboring topic headings.
Answer: D. R905
Why: R905 is the roof-coverings section. R802 concerns wood roof framing, R803 roof sheathing, and R806 ventilation. After locating the covering provisions, select the specific material and read its conditions; this question does not establish a slope or underlayment requirement.
Code: 2021 IRC R905 · 2024 IRC R905
Sources: ICC 2021 IRC contents — PDF pp. 20–21, Chapter 9 and neighboring topic headings; ICC 2024 IRC contents — PDF pp. 19–20, Chapter 9 and neighboring topic headings.
B1-25. Roof/Ceiling Construction · 2024 IRC · Code navigation
A 2024 IRC question concerns reroofing, not applying a roof coating or classifying a new roof’s fire resistance. Which section is the closest starting point?
- A. R908
- B. R902
- C. R904
- D. R909
Reveal answer for B1-25
Answer: A. R908
Why: R908 is Reroofing. B is the fire-classification route, C addresses materials, and D is Roof Coatings. A nearby roofing heading is not a substitute for the reroofing provision that governs the stated work.
Code: 2024 IRC R908
Sources: ICC 2024 IRC contents — PDF pp. 19–20, Chapter 9 and neighboring topic headings.
Answer: A. R908
Why: R908 is Reroofing. B is the fire-classification route, C addresses materials, and D is Roof Coatings. A nearby roofing heading is not a substitute for the reroofing provision that governs the stated work.
Code: 2024 IRC R908
Sources: ICC 2024 IRC contents — PDF pp. 19–20, Chapter 9 and neighboring topic headings.
Public Safety and Special Construction (5 questions)
B1-26. Public Safety and Special Construction · 2021 IRC · Code application
An emergency escape and rescue opening is stipulated to qualify as a grade-floor opening under the 2021 IRC. Its rectangular net clear opening is 20 in wide by 34 in high. Considering only the 5.0-sq-ft clear-area requirement illustrated in ICC’s 2021 excerpt, does it meet that area requirement?
- A. Yes, because each dimension is more than 12 in.
- B. No, because its net clear area is about 4.72 sq ft.
- C. Yes, because 680 sq in equals 6.80 sq ft.
- D. The area cannot be calculated from the two dimensions.
Reveal answer for B1-26
Answer: B. No, because its net clear area is about 4.72 sq ft.
Why: 20 × 34 = 680 sq in. Divide by 144 to get square feet: 680 ÷ 144 ≈ 4.72 sq ft, which is less than 5.0. A substitutes individual dimensions for area; C uses the wrong conversion; D ignores the supplied rectangular opening dimensions. Grade-floor classification depends on the clear opening’s relationship to adjacent finished ground, not simply its story name. This answers the area check only.
Math: 20 in × 34 in = 680 sq in; 680 ÷ 144 ≈ 4.72 sq ft < 5.0 sq ft
Code: 2021 IRC R202; grade-floor clear-area figure in ICC excerpt
Sources: ICC 2021 IRC excerpt — PDF p. 4, R202 grade-floor definition and figure caption showing 5.0 sq ft.
Answer: B. No, because its net clear area is about 4.72 sq ft.
Why: 20 × 34 = 680 sq in. Divide by 144 to get square feet: 680 ÷ 144 ≈ 4.72 sq ft, which is less than 5.0. A substitutes individual dimensions for area; C uses the wrong conversion; D ignores the supplied rectangular opening dimensions. Grade-floor classification depends on the clear opening’s relationship to adjacent finished ground, not simply its story name. This answers the area check only.
Math: 20 in × 34 in = 680 sq in; 680 ÷ 144 ≈ 4.72 sq ft < 5.0 sq ft
Code: 2021 IRC R202; grade-floor clear-area figure in ICC excerpt
Sources: ICC 2021 IRC excerpt — PDF p. 4, R202 grade-floor definition and figure caption showing 5.0 sq ft.
B1-27. Public Safety and Special Construction · 2021 IRC and 2024 IRC · Code navigation
Your 2021 notes send a means-of-egress question to R311. Which pair follows that topic into the 2024 IRC?
- A. R310 → R319
- B. R308 → R324
- C. R311 → R318
- D. R314 → R310
Reveal answer for B1-27
Answer: C. R311 → R318
Why: Means of egress moved from R311 to R318. A follows emergency escape and rescue openings, B glazing, and D smoke alarms. Similar life-safety purposes do not make these sections interchangeable.
Code: 2021 IRC R311 · 2024 IRC R318
Sources: ICC 2021 IRC contents — PDF p. 20, Chapter 3; ICC 2024 IRC relocation table — PDF p. 15, printed p. 14.
Answer: C. R311 → R318
Why: Means of egress moved from R311 to R318. A follows emergency escape and rescue openings, B glazing, and D smoke alarms. Similar life-safety purposes do not make these sections interchangeable.
Code: 2021 IRC R311 · 2024 IRC R318
Sources: ICC 2021 IRC contents — PDF p. 20, Chapter 3; ICC 2024 IRC relocation table — PDF p. 15, printed p. 14.
B1-28. Public Safety and Special Construction · 2024 IRC · Code navigation
You need the 2024 IRC heading for guards and window fall protection, rather than handrails. Which section is the starting point?
- A. R318
- B. R319
- C. R320
- D. R321
Reveal answer for B1-28
Answer: D. R321
Why: R321 is Guards and Window Fall Protection. R318 is means of egress, R319 emergency escape and rescue openings, and R320 handrails. Distinguish a guard question from a handrail question before searching for a dimension.
Code: 2024 IRC R321
Sources: ICC 2024 IRC contents — PDF pp. 19–20, Chapter 3 and neighboring topic headings.
Answer: D. R321
Why: R321 is Guards and Window Fall Protection. R318 is means of egress, R319 emergency escape and rescue openings, and R320 handrails. Distinguish a guard question from a handrail question before searching for a dimension.
Code: 2024 IRC R321
Sources: ICC 2024 IRC contents — PDF pp. 19–20, Chapter 3 and neighboring topic headings.
B1-29. Public Safety and Special Construction · 2021 IRC and 2024 IRC · Code navigation
A saved note cites the 2021 IRC glazing section, R308. Which pair correctly follows the glazing topic to 2024?
- A. R317 → R304
- B. R308 → R324
- C. R302 → R302
- D. R305 → R313
Reveal answer for B1-29
Answer: B. R308 → R324
Why: Glazing moved from R308 to R324. A follows wood-decay protection, C fire-resistant construction, and D ceiling height. Finding the glazing section does not decide whether a specific pane is in a hazardous location; that requires the actual geometry, conditions and exceptions.
Code: 2021 IRC R308 · 2024 IRC R324
Sources: ICC 2021 IRC contents — PDF p. 20, Chapter 3; ICC 2024 IRC relocation table — PDF p. 15, printed p. 14.
Answer: B. R308 → R324
Why: Glazing moved from R308 to R324. A follows wood-decay protection, C fire-resistant construction, and D ceiling height. Finding the glazing section does not decide whether a specific pane is in a hazardous location; that requires the actual geometry, conditions and exceptions.
Code: 2021 IRC R308 · 2024 IRC R324
Sources: ICC 2021 IRC contents — PDF p. 20, Chapter 3; ICC 2024 IRC relocation table — PDF p. 15, printed p. 14.
B1-30. Public Safety and Special Construction · 2024 IRC · Code navigation
Which pair correctly identifies the 2024 IRC headings for smoke alarms first and carbon monoxide alarms second?
- A. R310 and R311
- B. R311 and R310
- C. R318 and R319
- D. R314 and R315
Reveal answer for B1-30
Answer: A. R310 and R311
Why: In 2024, smoke alarms are in R310 and carbon monoxide alarms in R311. B reverses them. C is the means-of-egress and escape-opening pair. D carries forward the 2021 alarm locations instead of using the requested edition.
Code: 2024 IRC R310; R311
Sources: ICC 2024 IRC contents — PDF p. 19, Chapter 3; ICC 2024 IRC relocation table — PDF p. 15, printed p. 14.
Answer: A. R310 and R311
Why: In 2024, smoke alarms are in R310 and carbon monoxide alarms in R311. B reverses them. C is the means-of-egress and escape-opening pair. D carries forward the 2021 alarm locations instead of using the requested edition.
Code: 2024 IRC R310; R311
Sources: ICC 2024 IRC contents — PDF p. 19, Chapter 3; ICC 2024 IRC relocation table — PDF p. 15, printed p. 14.
Scoring your 30
Count your correct answers in each topic, then go back to every miss and every lucky guess. Find the section yourself and write down why the tempting wrong option fails.
Your score here is feedback on these 30 questions only. It isn't an ICC score and it can't predict your result. Thirty items, with as few as one per topic, are too small a sample to measure your ability in any one area. Use it to decide what to study next.
If you work only the questions labeled for your edition, record that smaller set and its actual denominator. Keep navigation mistakes separate from rule-application mistakes, and do not rank topics by raw misses when you attempted different numbers of questions.
Study map: match the question to the chapter
Start with the routes or conditions you missed, then compare your study with your selected B1 catalog outline. These are study groups, not a verified current weighted blueprint. The map is a starting point, not a list of every task the exam can test.
| Study group | Questions here | Starting route for this resource and related review |
|---|---|---|
| Wall Construction and Coverings | 8 | Chapters 6–7; Chapter 3 for wood-decay protection |
| Public Safety and Special Construction | 5 | Chapter 3 for the safety topics practiced here; Chapter 10 for chimney/fireplace review |
| Footings and Foundations | 5 | Chapter 4: soil tests, footings, foundation walls, dampproofing and waterproofing |
| Floor Construction | 4 | Chapter 5; under-floor space is in R408, Chapter 4 |
| Roof/Ceiling Construction | 4 | Chapter 8 for framing, ventilation and access; Chapter 9 for roof assemblies |
| Building Planning | 3 | Chapter 2 for defined terms; Chapter 3 for the planning topics |
| Code Administration | 1 | Chapter 1: applicability, permits, construction documents and inspections |
Sources: ICC 2021 IRC contents and ICC 2024 IRC contents. The group labels also appear in ICC’s published B1 outline; that PDF is undated, so its percentages are not used to allocate this plan.
2021 vs 2024 IRC: where the sections moved
ICC’s current national-exam offerings list includes both 2021 and 2024 B1. If you're testing on the 2024 IRC, don't tab your book or study from 2021 section numbers. The 2024 edition reorganized Chapter 3. Your book must match the edition on your exam purchase, so check that first.
| Topic | 2021 IRC | 2024 IRC |
|---|---|---|
| Permits | R105 | R105 |
| Fire-resistant construction | R302 | R302 |
| Wood decay protection | R317 | R304 |
| Minimum room areas | R304 | R312 |
| Ceiling height | R305 | R313 |
| Smoke alarms | R314 | R310 |
| Garages and carports | R309 | R317 |
| Means of egress, including stairways | R311 | R318 |
| Emergency escape and rescue openings | R310 | R319 |
| Handrail provisions listed in ICC’s relocation table | R311.7.8.1–R311.7.8.6 | R320 |
| Guards and window fall protection | R312 | R321 |
| Glazing | R308 | R324 |
| Footings | R403 | R403 |
| Dampproofing and waterproofing | R406 | R406 |
| Crawl spaces (under-floor space) | R408 | R408 |
| Wood floor framing; start here for joist questions | R502 | R502 |
| Wood wall framing; start here for stud questions | R602 | R602 |
| Attic ventilation and attic access | R806, R807 | R806, R807 |
| Roof coverings; start here for asphalt-shingle questions | R905 | R905 |
| Reroofing | R908 | R908 |
This table tracks where topics moved, using ICC’s own 2024 IRC relocation list and contents and the 2021 IRC contents. A move doesn’t mean the text stayed identical. Matching parent-section numbers also do not establish that every subsection, value or exception is unchanged.
Two more edition points worth knowing:
- ICC writes exam questions from the first printing of the code book (ICC, Before the Exam). The 2024 IRC’s first printing was May 2024, as shown in its front matter.
- Match the national examination’s listed references, not a local amendment set. ICC says its national examinations address all U.S. regions. That exam-preparation instruction does not replace the legally adopted code for an actual project.
Your four-week ICC B1 study plan
This plan assumes five 1-hour sessions a week, 20 hours in total, with your edition of the IRC beside you. It's our editorial starting point, not an ICC requirement or a promise that four weeks is enough. Someone new to code books may need more time; an experienced builder should still check edition-specific habits.
Most sessions follow the same rhythm: 10 minutes recalling the last session without notes, 35 minutes on the day’s task, and 15 minutes checking your answers in the code and updating your error log. Session 18 uses the full hour for a timed repeat; session 19 provides its checking and review time.
The timetable is a learning sequence, not a claim that this set covers the complete exam. Keep the labeled source beside an exercise from the other edition, and use the selected official outline to extend your own-edition study beyond these questions.
| Week | Session | Task | What you finish with |
|---|---|---|---|
| 1 | 1 | Confirm your exam edition and its approved references. If using printed references, permanently tab chapter starts: 1, 2 and 3 through 10. | A tabbed book that matches your exam edition |
| 1 | 2 | Read the section headings in Chapter 6. Do questions B1-14 to B1-18 using their labeled 2021 source, then distinguish that exercise from reading your own edition. | One sentence for each miss explaining the rule |
| 1 | 3 | Read Chapter 7 headings and find wood-decay protection using the crosswalk. Do B1-19 to B1-21. | Separate routes for interior covering, exterior covering and decay protection |
| 1 | 4 | Practice index searches for these 10 wall terms: stud, notch, bored hole, wood framing, interior covering, exterior covering, decay, header, braced wall and sheathing. | Index routes written in your log |
| 1 | 5 | Redo B1-14 to B1-21 without looking at your notes. Keep each question’s edition label attached. | Error log entries for anything slow or uncertain |
| 2 | 6 | Read the means of egress section in your edition (R311 or R318). Do B1-27. | Tabs on stairs, handrails and guards in your edition |
| 2 | 7 | Read emergency escape openings and glazing in your reference. Do the labeled 2021 area exercise B1-26 and the relocation exercise B1-29. | A worked area calculation checked against the cited 2021 source |
| 2 | 8 | Read guards and smoke alarms in your reference. Do the two labeled 2024 navigation exercises, B1-28 and B1-30. | Your edition written beside the guard and alarm routes |
| 2 | 9 | Building Planning: distinguish a defined term, a fire-resistant-construction heading and the general garage heading. Do B1-02 to B1-04. | A definition and two topic routes recorded with their editions |
| 2 | 10 | Redo B1-02 to B1-04 and B1-26 to B1-30 in a 16-minute practice window; use the rest of the session to review. | Time used and uncertain routes, not a readiness prediction |
| 3 | 11 | Chapter 4: use B1-05 to B1-07 for the labeled 2024 footing-support, figure-reading and soil-test applications; complete B1-08’s foundation-wall lookup. | A checked condition or calculation for each application |
| 3 | 12 | Foundation walls (R404) and dampproofing and waterproofing (R406). Do B1-09, then read the actual conditions in your reference. | A distinction between finding a heading and applying a treatment rule |
| 3 | 13 | Chapter 5 floor framing: do the labeled 2021 joist exercises B1-10 and B1-11, then locate the relevant provisions in your own edition. | Notch and hole limits written with their measuring points |
| 3 | 14 | Find crawl spaces (R408) and exterior decks (R507). Do B1-12 and B1-13. | Two topic-specific routes instead of one generic floor route |
| 3 | 15 | Pick one span table in Chapter 5 and read its footnotes before you use any value. | A list of the inputs that table needs |
| 4 | 16 | Chapters 8 and 9: attic ventilation, attic access, roof coverings and reroofing. Do B1-22 to B1-25. | Tabs on R806, R807, R905 and R908 |
| 4 | 17 | Read Chapter 10 chimneys and fireplaces headings, plus Chapter 1 applicability and permits. Do the labeled 2021 application B1-01. | Separate routes for R102, R105 and Chapter 10 |
| 4 | 18 | Timed repeat: all 30 questions in 60 minutes, using each stated edition or its cited excerpt. Reserve this entire session for the repeat; do the checking in session 19. | Recorded answers and flags for uncertain choices; no mock-exam claim |
| 4 | 19 | Check every answer from session 18. Review misses and uncertain correct answers, then choose two recurring error types to repair. | A corrected explanation for each miss or uncertain answer |
| 4 | 20 | Final check: edition, references, tabs, ID and testing method. Compare your work with the selected official outline and list any untouched tasks. | A checked exam-day list and a specific next-study list |
Short on time? Combine two sessions a day, but keep the checking step; that’s where the learning happens. Have longer? Spend two weeks on each block and repeat the timed run at the end. Repeating these familiar questions measures improvement on this set, not performance on unseen exam questions.
Keep an error log
Write down every miss and every uncertain correct answer. A lucky guess hides the same gap as a wrong answer.
| Date | Question | Edition | Result | Error type | The rule, with source | Next action |
|---|---|---|---|---|---|---|
| Example only | B1-26 | 2021 | Wrong, picked A | Checked individual dimensions but not area | ICC 2021 excerpt, PDF p. 4: grade-floor opening, 5.0 sq ft; calculated 4.72 sq ft | Redo with the area and square-unit conversion steps |
Useful error types: wrong edition, wrong section, missed a condition, missed a definition, footnote or exception, math or units, slow lookup. ICC warns that exam questions can turn on appendices, footnotes and exceptions, so read past the first number you find (ICC, Before the Exam).
How to work any code question
- Note your edition and what the question actually asks. Watch for minimum, maximum, except and not.
- Name the topic before you search, then use the contents or index to go straight there.
- Read the rule and check any defined term that could change the answer.
- For a table, find the right row and column, check the units, and read the footnotes.
- Apply any exception, then do only the math the question needs. Convert mixed units first: 4 ft 3 in is 51 inches, not 4.3 feet.
- Answer, and in practice, write down why the closest wrong option fails.
For a table exercise, write the edition, requested result, supplied inputs, table and row/column, relevant notes, and calculation with units. If a needed input is missing, identify it rather than inventing a soil type, load or material grade. The conversion above is (4 × 12) + 3 = 51 inches; it is not a code minimum.
Exam format and open-book rules
ICC’s published B1 outline lists 60 multiple-choice questions, two hours and open book. The PDF does not identify its date or code edition; use your selected B1 catalog entry for the edition-specific outline, approved references and available delivery method. ICC explains how to find and print that outline.
Open book does not mean any book. Binding a resource does not make it an approved exam reference. ICC’s general material rules include the following (ICC Administrative Rules):
- Bound only: the original binding, a three-ring binder, or stapled.
- No photocopies of copyrighted material.
- Notes in ink or highlighting only.
- Tabs must be permanently attached, meaning they can't be removed without destroying the page. Removable sticky tabs don't qualify.
- Calculators must be nonprogrammable, battery-operated, unable to store exam information, and without printing. They must be limited to basic arithmetic, square roots and percentages.
You can't bring writing paper. Online PRONTO candidates use an on-screen notepad instead (ICC, During the Exam). Some ICC exams also offer digital code access during testing. The catalog marks those exams in red text in the Scope section, so check your entry instead of assuming either way (ICC Exam Catalog). These study excerpts are sources for the answers here, not a claim that they are permitted exam-day references.
How the B1 is scored
You pass with a scaled score of 75. ICC says that number is not a percentage and not a count of correct answers (ICC on the 75 score). So "45 out of 60," a figure you'll see on some prep sites, isn't the target. Scaling adjusts for differences between exam versions, so the number of correct answers needed can vary.
Two practical points from ICC (During the Exam):
- There is no penalty for a wrong answer, so answer every question.
- You can bookmark a question and come back to it. Use that instead of burning eight minutes on one stuck lookup.
Two hours for 60 questions averages two minutes each. Some lookups take 30 seconds and some take four minutes; the average is what matters. Results are available right away (ICC, Exam Overview).
Buying, scheduling and retakes
- Price: check the current fee for your selected B1 edition and delivery choice in the ICC Exam Catalog before paying. ICC members get discounted exam pricing.
- Choose carefully: Before paying, match the exam ID (B1), code year and testing method, because your book must match the code year.
- Timing: you pay before you schedule, and you have 365 days to schedule after purchase (ICC Exam Registration).
- Where you test: ICC’s PRONTO program offers remote online testing, available around the clock, or in-person testing at a Meazure Learning test center (ICC PRONTO). Use the options actually offered for your selected B1 entry. Remote testing needs a secure browser, webcam and microphone; Chromebooks, tablets and Linux aren’t supported.
- ID: bring valid, original government-issued photo identification with a signature and the same legal first and last name as your exam record (ICC identification rules).
- Can’t make it? Withdraw through ICC’s process. A no-show forfeits the fee, and there are no refunds for exams not taken (ICC registration guidance).
- Retakes: after an unsuccessful national-certification attempt, ICC permits six attempts within six months, with the exam fee paid each time. After six attempts, the next registration must wait until six months from the first attempt—not six more months from the sixth attempt (ICC national-certification retake rules).
- Accommodations: use ICC’s testing-accommodation request process before arranging an accommodated appointment. Do not assume a requested adjustment can be approved at check-in.
Does a B1 certificate let you inspect?
Not by itself. B1 is a national ICC certification. Whether you can work as an inspector depends on your employer and your jurisdiction. ICC's own advice is to start by checking what your job requires (ICC, Before the Exam). ICC certifications are valid for three years; renewal rules are on ICC's maintain and renew page.
Sources and independence
Last verified October 5, 2026: the cited edition-offerings list, published B1 format statement, scoring and general administration guidance, section locations, and the particular edition-labeled code excerpts and figures used here. The study plan is editorial; the questions do not reproduce a complete current exam blueprint.
Exam facts: current national-exam list (updated January 12, 2026); published B1 outline (undated); exam-specific catalog; 75 scaled-score explanation (updated May 13, 2026); Before the Exam; During the Exam; Exam Overview; Administrative Rules; PRONTO; registration guidance; candidate requests; and maintain and renew.
Code sources: 2021 IRC contents; 2024 IRC contents and relocation table; the 2021 IRC excerpts for additions, defined terms and the grade-floor opening example; the 2024 IRC excerpts for soil tests and footing/stem-wall applications; and ICC CodeNotes on cutting, drilling and notching, which expressly uses the 2021 IRC, despite its 2024 publication date. Each answer identifies its particular page, figure or section.
Written by the Castleport Test Prep Editorial Team. AI-assisted tools were used in developing and checking this resource, as described in our methodology. Source checks are not professional review. This page hasn’t had professional code-official review. If you find an error, tell us through our corrections process. See also our independence policy.
Castleport Test Prep is an independent exam prep publisher. It is not affiliated with, endorsed by, or approved by the International Code Council (ICC). Exam, credential and code names, including B1, PRONTO and International Residential Code, are used to identify their subjects; trademarks belong to their respective owners. The practice questions are original and unofficial. This page doesn't determine whether any project complies with code, and it doesn't guarantee a passing score, certification or employment.