2024 Residential Plans Examiner – Practice Quiz (Untimed)

2024 Residential Plans Examiner (R3) (Untimed)

60 Questions

2 Hours

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1. A dry vent connecting to a horizontal drain shall connect in which position relative to the centerline of the horizontal drain pipe?

A) Either above or below the centerline.

B) Above the centerline.

C) At the centerline.

D) Below the centerline.

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2. If the free area of a metal louver or grille is not known, what percentage of its gross area should be assumed as free area?

A) 75%

B) 50%

C) 25%

D) 90%

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3. A Type L vent system used with a solid fuel or oil-fired appliance must conform to which listing requirement?

A) UL 378

B) UL 103

C) UL 181

D) UL 641

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4. Which of the following would NOT be an acceptable identification method for a 4 AWG or larger insulated grounded conductor?

A) White insulation covering the entire conductor length

B) Black insulation with three white stripes along the entire length

C) Green insulation with three white stripes along the entire length

D) Black insulation with white tape encircling the conductor at each termination

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5. How far must chimney anchorage straps be embedded into the chimney?

A) 6 inches

B) 10 inches

C) 8 inches

D) 12 inches

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6. What is the minimum required lap for horizontal application of No. 15 felt or ASTM E2556-compliant barriers?

A) 4 inches

B) 1 inch

C) 2 inches

D) 6 inches

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7. What is the minimum lap required for fiber-cement lap siding?

A) 1 inch

B) 1-1/4 inches

C) 3/4 inch

D) 1/2 inch

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8. What is the required fire separation distance for dwellings without sprinklers or fire-rated walls?

A) 5 feet

B) 10 feet

C) 3 feet

D) 0 feet

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9. Combustion air for solid fuel-burning appliances must be provided in accordance with:

A) The appliance manufacturer’s installation instructions

B) Chapter 24 of the IRC

C) NFPA 31

D) Section M1601

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10. When installing polyethylene pipe, bends within what distance of any fitting or valve are prohibited?

A) 20 pipe diameters

B) 5 pipe diameters

C) 15 pipe diameters

D) 10 pipe diameters

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11. How is a conflict between a referenced code and the IRC resolved?

A) The IRC takes precedence

B) The referenced code applies only if the IRC is silent on the matter

C) Whichever code is most restrictive applies

D) The referenced code always applies

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12. How many fasteners are required per slate shingle during installation?

A) Three

B) Four

C) Two

D) One

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13. Which of the following is an acceptable bracing element for the bottom flange of roof rafters?

A) 50-mil hat channel

B) 20-gauge wood blocking

C) 25-mil Z-shaped member

D) 33-mil C-shaped member

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14. What is the maximum allowable span for a 2×6, #3 grade Hem-fir rafter spaced 24 inches apart, with a dead load of 20 psf, ceiling attached, and a roof live load of 50 psf?

A) 7'-8"

B) 6'-2"

C) 3'-10"

D) 5'-7"

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15. What is the minimum required height for a parapet wall separating townhouses?

A) 30 inches

B) 48 inches

C) 36 inches

D) 24 inches

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16. Where a storage tank-type water heater is installed in a location where water leakage will cause damage, the pan constructed of galvanized steel or aluminum must have a thickness of not less than what dimension?

A) 0.10 inch (2.54 mm)

B) 0.0575 inch (1.46 mm)

C) 0.036 inch (0.9 mm)

D) 0.0236 inch (0.6010 mm)

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17. Which wiring method is not permitted to be run exposed?

A) UF

B) AC

C) USE

D) EMT

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18. Which type of metallic piping is permitted to be placed in direct contact with masonry or concrete?

A) Cast iron

B) Copper

C) Steel pipe

D) Brass

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19. The minimum flexible cord length permitted for an in-sink waste disposal is:

A) 24 inches

B) 18 inches

C) 30 inches

D) 36 inches

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20. What is the minimum required size and thickness for header and trimmer joists used in cold-formed steel floor openings?

A) At least equivalent in size and thickness to the adjacent floor joists

B) Double the thickness of the adjacent floor joists

C) One size smaller than the adjacent floor joists

D) The same size but half the thickness of the adjacent floor joists

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21. What is the minimum thickness of a solid wood door used to separate a garage and a sleeping room of a dwelling unit?

A) 1 ¾ inches

B) 2 inches

C) Openings are not permitted

D) 1 ⅜ inches

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22. What is the minimum required guard height for a residential balcony?

A) 36 inches

B) 42 inches

C) 30 inches

D) 48 inches

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23. In windborne debris regions, what test standards must impact protective systems comply with for impact resistance?

A) ASTM E1886 and ASTM E1996

B) AAMA 506

C) ASTM E330

D) ANSI WMA 100

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24. What is the maximum design live load permitted for floor joists supporting areas other than sleeping areas and attics?

A) 60 pounds per square foot (2.88 kPa)

B) 50 pounds per square foot (2.40 kPa)

C) 30 pounds per square foot (1.44 kPa)

D) 40 pounds per square foot (1.92 kPa)

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25. What is the required minimum depth of a landing for an exterior egress door?

A) 24 inches

B) 30 inches

C) 28 inches

D) 36 inches

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26. What is the minimum required distance between the centerline of a toilet and a sidewall?

A) 18 inches

B) 15 inches

C) 12 inches

D) 10 inches

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27. For hydronic piping systems, copper tubing embedded in concrete must have what type of joints?

A) Brazed

B) Press-connected

C) Soldered

D) Mechanical

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28. Fireplace stoves must be tested in accordance with which of the following standards?

A) UL 1995

B) UL 1482

C) UL 1042

D) UL 737

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29. What is the minimum required thickness for rubble stone masonry foundation walls?

A) 16 inches (406 mm)

B) 12 inches (305 mm)

C) 8 inches (203 mm)

D) 20 inches (508 mm)

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30. Where none of the required conductive surfaces are bonded in direct connection with the pool water, the pool water shall be in contact with an approved corrosion-resistant conductive surface exposing not less than how many square inches of surface area to the water at all times?

A) 6 square inches

B) 9 square inches

C) 3 square inches

D) 12 square inches

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31. What is the required type of backwater valve when plumbing fixtures are installed on a floor with a finished floor elevation above the elevation of the next upstream manhole cover?

A) Check valve only

B) Normally closed type

C) Normally open type

D) Manual isolation type

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32. What is the minimum footing size (width × thickness in inches) required for a 1-story cast in-place concrete with crawl space structure with a 50 psf roof live load and 1,500 psf soil bearing capacity?

A) 14 × 6

B) 14 × 8

C) 19 × 6

D) 18 × 6

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33. External reflective duct insulation must be labeled at intervals not exceeding:

A) 48 inches

B) 24 inches

C) 30 inches

D) 36 inches

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34. What is the maximum allowable slope for a ramp serving an egress door?

A) 1:6

B) 1:8

C) 1:12

D) 1:10

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35. If the depth-to-thickness ratio exceeds 6 to 1, how must rafters and ceiling joists be supported laterally?

A) With metal joist hangers

B) With collar ties

C) With gusset plates and straps

D) With solid blocking, diagonal bridging, or a 1×3 continuous wood strip

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36. Factory-built chimneys used to vent appliances operating under positive vent pressure must meet which of the following requirements?

A) Be lined with Type B vent

B) Be listed for positive pressure applications in accordance with UL 103

C) Include a backdraft damper

D) Be constructed of clay or metal

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37. What is the minimum thickness for a concrete slab-on-grade for habitable spaces?

A) 4 inches

B) 3 inches

C) 3.5 inches

D) 2 inches

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38. What are the minimum required dimensions for the passageway to access appliances located under floors?

A) 24 inches high and 20 inches wide

B) 30 inches high and 22 inches wide

C) 20 inches high and 18 inches wide

D) 36 inches high and 30 inches wide

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39. Which standard applies to Polyethylene (PE) plastic pipe used for subsoil drains?

A) ASTM F891

B) CSA B182.1

C) ASTM D3034

D) ASTM D2729

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40. What is the required minimum net clear opening height for an emergency escape and rescue opening?

A) 20 inches

B) 24 inches

C) 26 inches

D) 22 inches

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41. True or False: Raceways embedded in masonry are not required to be arranged to drain.

A) False

B) True

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42. The standard reference design is a version of the proposed design used to determine which requirement?

A) The f-factor of the slab

B) The minimum fenestration area

C) The optimal ventilation rate

D) The maximum annual energy use requirement

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43. Domestic cooking appliances with integral downdraft exhaust must be listed and labeled in accordance with:

A) ANSI Z21.1 or UL 858

B) UL 507

C) UL 181

D) UL 923 or ANSI Z21.1

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44. For CSST that is not arc-resistant the bonding jumper shall be connected to which of the following?

A) fitting

B) or CSST fitting.

C) A ground rod.

D) A metallic pipe

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45. A 1-2×12 header is supporting a roof, ceiling, and two clear-span floors in a 36-foot-wide building with a 50 psf snow load. What is the maximum allowable span?

A) 4'-0"

B) 5'-2"

C) 3'-0"

D) 4'-6"

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46. What type of bracing method is used for continuously sheathed portal frames (CS-PF)?

A) CS-G

B) See Section R602.10.6.4

C) CS-WSP

D) CS-PF

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47. What is the maximum allowable hole diameter in a solid lumber joist, rafter, or beam?

A) One-third of the depth of the member

B) One-fourth of the depth of the member

C) One-half of the depth of the member

D) There is no restriction

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48. Where must renewable energy resources be harvested to be classified as on-site renewable energy?

A) From a utility power grid

B) Within 100 feet of the building

C) At the building site

D) Within the climate zone

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49. What is the maximum allowable deflection for a residential floor joist under live load?

A) L/180

B) L/240

C) L/360

D) L/480

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50. If a laundry tray waste line connects into a standpipe for an automatic clothes washer, the standpipe must extend not less than how far above the standpipe trap weir?

A) 18 inches (457 mm)

B) 42 inches (1067 mm)

C) 24 inches (610 mm)

D) 30 inches (762 mm)

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51. What is the minimum thickness of a solid wood door used to separate a garage and a dwelling unit?

A) 1 ⅜ inches

B) 2 inches

C) 1 inch

D) 1 ¾ inches

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52. What is the minimum height of a guardrail required for stairways more than 30 inches above grade?

A) 42 inches

B) 30 inches

C) 34 inches

D) 36 inches

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53. What protection is required for wood columns according to the IRC?

A) A waterproof coating must be applied to all wood columns regardless of location.

B) No protection is required unless the columns are exposed to water.

C) Wood columns must be encased in concrete to prevent decay.

D) Wood columns must be protected against decay as required in Section R304.

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54. A metal underground water pipe must be in direct contact with the earth for a minimum of how many feet to qualify as a grounding electrode?

A) 8 feet

B) 12 feet

C) 5 feet

D) 10 feet

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55. In what condition is solid sheathing required under wood shingles?

A) On roofs with less than 3:12 slope

B) Where the average January temperature is 25°F or less

C) When using fire-treated shingles

D) When wind speed exceeds 120 mph

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56. Which of the following is listed as a prohibited trap design?

A) Drum traps

B) P-traps

C) Half-S traps

D) Running traps

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57. Ungrounded service conductors for other than dwelling units shall have an ampacity of not less than how many amperes?

A) 60

B) 100

C) 15

D) 30

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58. What is the minimum footing size (width × thickness in inches) required for a 3-story light-frame with brick veneer crawl space structure with a 50 psf roof live load and 2,000 psf soil bearing capacity?

A) 19 x 7

B) 20 x 8

C) 16 × 6

D) 21 x 7

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59. What is the allowable ampacity of a No. 2 AWG aluminum conductor with 60°C insulation?

A) 85 amps

B) 100 amps

C) 75 amps

D) 90 amps

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60. At an ambient temperature of 41–45°C, what is the correction factor for a conductor rated at 90°C?

A) 0.82

B) 0.91

C) 0.75

D) 0.87

Your score is

2024 Residential Plans Examiner – Practice Quiz (Untimed)

“This untimed practice quiz simulates the ICC exam format, giving you full exposure to real-style questions while allowing unlimited time to navigate, learn, and build confidence without time pressure.”