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CSLB General Building (B) practice questions

213 free questions with answers and explanations.

Practice test
  1. 1.A contractor is sizing attic ventilation for a single-story home with a gable roof and no vapor retarder installed at the ceiling. The attic floor area is 1,800 square feet. Per the 1/150 rule with ventilation split evenly between high (ridge) and low (soffit) vents, how much net free ventilating area is required at the soffit vents alone?Finishes and Building Envelope
  2. 2.A framer toe-nails a stud to the bottom plate using 8d common nails driven at an angle through the face of the stud into the plate. What is the standard toe-nailing angle from the face of the stud, and how many 8d nails are typically required for this connection?Framing and Carpentry
  3. 3.A contractor installs a guardrail along an open stairway landing that is 36 inches above the finished floor. The building inspector requires a taller rail. What is the minimum required guardrail height for this application?Framing and Carpentry
  4. 4.A framer is boring holes through the middle of 2x10 floor joists for plumbing pipe. According to standard framing limitations, what is the maximum allowable hole diameter as a fraction of the joist depth?Framing and Carpentry
  5. 5.A soils report identifies the site as having highly expansive clay soil with significant seasonal swell and shrinkage. Which foundation design approach is most appropriate to mitigate this condition?Site Work, Foundations and Concrete
  6. 6.A contractor is coordinating rough-in work in a bathroom where the HVAC duct, electrical conduit, and plumbing drain line all need to pass through the same wall cavity. What is the best practice to avoid a failed rough-in inspection?Mechanical, Electrical, Plumbing Coordination
  7. 7.During a bathroom rough-in coordination meeting, the plumber's 4-inch drain line, the electrician's conduit, and the HVAC contractor's duct all compete for the same joist bay. Which trade's system should generally be given routing priority when resolving the conflict?Mechanical, Electrical, Plumbing Coordination
  8. 8.A jack truss transfers a concentrated point load of 900 pounds to the exact midspan of a girder truss that spans 20 feet and is simply supported at each end. Assuming the girder truss carries no other loads, what is the reaction force at each end support?Framing and Carpentry
  9. 9.A contractor is attaching a deck ledger board to the rim joist of an existing house using 1/2-inch lag screws. Per standard deck construction practice, what is the typical maximum on-center spacing for these lag screws in a staggered pattern?Framing and Carpentry
  10. 10.A soils report specifies an allowable bearing capacity of 2,000 pounds per square foot for a site. A contractor designs an isolated column footing measuring 2 feet by 2 feet to support a total column load of 10,000 pounds. Is this footing adequate?Site Work, Foundations and Concrete
  11. 11.A contractor is insulating an attic in California Climate Zone 12 to meet Title 24 prescriptive requirements for a new single-family residence. Which ceiling insulation R-value is typically required for standard attic assemblies in most California climate zones?Finishes and Building Envelope
  12. 12.A continuous footing is being constructed on a steeply sloped lot, requiring the footing to step down in elevation along its length. According to standard code provisions for stepped footings, what is the maximum slope (rise to run) typically permitted between steps?Site Work, Foundations and Concrete
  13. 13.A remodeling contractor wants to attach a new mechanical unit that will impose a 200-pound point load on the bottom chord of a manufactured wood floor truss, at a location not shown as a load point on the truss design drawing. What is the correct course of action before installation?Framing and Carpentry
  14. 14.A framer cuts a birdsmouth (seat cut) into a 2x8 rafter to seat it on the top plate. The rafter is 7.25 inches deep. Per standard framing practice, what is the maximum depth the seat cut should be to avoid excessively weakening the rafter?Framing and Carpentry
  15. 15.A contractor finishes a residential concrete slab and immediately covers it with plastic sheeting for seven days. What is the primary purpose of this practice?Site Work, Foundations and Concrete
  16. 16.A contractor is fire blocking a continuous interior partition wall that has an unbroken concealed stud space running 22 feet in length with no floor or ceiling level interruption. Per the California Residential Code, at what maximum horizontal interval must fire blocking be installed along this run?Mechanical, Electrical, Plumbing Coordination
  17. 17.During MEP coordination, an HVAC contractor needs to route a supply duct through a 1-hour fire-rated corridor wall in a multi-family building. What additional component must typically be installed at the penetration to maintain the wall's fire-resistance rating?Mechanical, Electrical, Plumbing Coordination
  18. 18.A roofer is installing step flashing along a sidewall intersection where the composition shingle exposure is 6 inches. Code requires each step flashing piece to overlap the piece below it by a minimum of 2 inches. What is the minimum overall length of each step flashing piece measured along the roof slope?Finishes and Building Envelope
  19. 19.A geotechnical engineer performs a Standard Proctor compaction test on soil samples from a building pad. What does this test primarily determine?Site Work, Foundations and Concrete
  20. 20.Which of the following materials is NOT an approved fire blocking material under the California Residential Code?Mechanical, Electrical, Plumbing Coordination
  21. 21.A hip roof has common rafters running a horizontal distance (run) of 12 feet from the exterior wall to the ridge. The valley rafter serving the same roof section runs diagonally at a 45-degree angle in plan view. Approximately what horizontal run does the valley rafter span, and what is the design implication?Framing and Carpentry
  22. 22.A contractor is adding temporary let-in diagonal corner bracing to a wood-framed wall before sheathing is installed. For the brace to effectively resist racking, at what approximate angle should it be installed relative to the horizontal top and bottom plates?Framing and Carpentry
  23. 23.A drywall installer is hanging 1/2-inch gypsum board on wood-framed ceilings and walls in a standard living room with no fire rating requirement, using screws only (no adhesive). Per typical fastening schedules, how should screw spacing generally compare between the ceiling and the wall applications?Finishes and Building Envelope
  24. 24.A shear wall segment is 4 feet wide and 8 feet tall, resisting a lateral shear force of 800 pounds applied at the top of the wall. Ignoring the dead load resisting the overturning moment, what tension force must the hold-down anchor resist at the leading edge of the wall?Framing and Carpentry
  25. 25.A roof plane measures 24 feet (288 inches) from eave to ridge and requires double-layer underlayment per code because its slope is 3:12. Using 36-inch-wide underlayment rolls applied with a 19-inch starter strip and 19-inch head lap (each subsequent course exposing 17 inches), how many total courses of underlayment are needed to cover the plane?Finishes and Building Envelope
  26. 26.A concrete finisher is placing a footing pour and uses a mechanical vibrator to consolidate the concrete around the rebar cage. What is the primary purpose of vibrating the concrete during placement?Site Work, Foundations and Concrete
  27. 27.A contractor is preparing for a monolithic slab pour on a residence with underslab plumbing and electrical conduit. Which sequencing step is essential before the concrete pour proceeds?Mechanical, Electrical, Plumbing Coordination
  28. 28.A contractor is roofing a home located in a designated mountain area with a documented history of ice dam formation. Per California Residential Code requirements for such areas, an ice barrier membrane must extend from the roof eave edge to a point how far up the roof, measured horizontally inside the exterior wall line of the building?Finishes and Building Envelope
  29. 29.A double 2x12 Douglas fir-larch beam carries a reaction of 3,200 pounds at its bearing point. The allowable compression stress perpendicular to grain (Fc⊥) for this species is 625 psi, and the beam is 3.5 inches wide. What is the minimum required bearing length to prevent crushing at the support?Framing and Carpentry
  30. 30.During excavation for a building foundation, the crew encounters groundwater seeping into the excavation, leaving the subgrade soil saturated and soft. What is the most appropriate action before proceeding with the footing pour?Site Work, Foundations and Concrete
  31. 31.A masonry chimney passes through a combustible wood-framed floor/ceiling assembly. What is the code-required treatment at this penetration to address fire safety?Mechanical, Electrical, Plumbing Coordination
  32. 32.A window opening is 6 feet wide and supports a roof-only tributary width of 12 feet, with a combined dead and live roof load of 40 pounds per square foot. What is the reaction force at each end of the header supporting this opening?Framing and Carpentry
  33. 33.A framer needs to cut a hole through the web of an engineered wood I-joist to run a plumbing waste line. Where should the contractor look to determine the allowable hole size and location?Mechanical, Electrical, Plumbing Coordination
  34. 34.A contractor is finishing grading around a newly completed foundation. Per standard California building code requirements, the finish grade adjacent to the foundation must slope away from the structure at a minimum rate of:Site Work, Foundations and Concrete
  35. 35.A contractor is selecting fire blocking material for concealed stud cavities in a wood-framed home. Which of the following meets the California Residential Code minimum requirement for solid lumber fire blocking?Mechanical, Electrical, Plumbing Coordination
  36. 36.A roofer is installing an open valley on a composition shingle roof where two roof planes intersect. Per standard California roofing practice, what is the minimum acceptable width of the corrosion-resistant sheet metal valley flashing?Finishes and Building Envelope
  37. 37.A ready-mix concrete truck arrives at a jobsite, and the field technician performs a slump test before the pour begins. What does this test primarily measure?Site Work, Foundations and Concrete
  38. 38.A building inspector measures a stairway's handrail height at 30 inches, measured vertically from the nosing of the treads. The contractor is told to raise the handrail. What is the acceptable handrail height range required by code for this measurement?Framing and Carpentry
  39. 39.A concrete supplier delivers aggregate for a footing pour that includes a mix of particle sizes ranging from fine sand to 3/4-inch stone, rather than aggregate that is all one size. What is the primary benefit of using this well-graded aggregate in the mix design?Site Work, Foundations and Concrete
  40. 40.A shear wall segment used for lateral bracing is 4 feet wide and 10 feet tall, giving an aspect ratio of 2.5:1. Per CBC wood structural panel shear wall provisions, what must be done with this segment's tabulated shear capacity before using it in design?Framing and Carpentry
  41. 41.A structural plan calls for #8 rebar (1-inch diameter) to be placed in a footing with a maximum aggregate size of 1 inch. According to ACI 318 minimum clear spacing requirements, what is the minimum required clear spacing between the bars?Site Work, Foundations and Concrete
  42. 42.A new single-family home has a conditioned floor area of 2,000 square feet. Under Title 24 Part 6 prescriptive standard design defaults, what is the maximum total fenestration (window) area typically allowed without triggering additional energy compliance measures?Finishes and Building Envelope
  43. 43.An insulation contractor is installing R-19 fiberglass batt insulation, rated for a 6.25-inch cavity depth, into a 2x4 wood-framed wall with an actual cavity depth of only 3.5 inches. What is the most accurate consequence of this installation for Title 24 compliance purposes?Finishes and Building Envelope
  44. 44.A roofer is installing counter-flashing into a reglet cut in a masonry chimney above existing step flashing on a composition shingle roof. To ensure a watertight seal, the counter-flashing should overlap the step flashing by a minimum of how much?Finishes and Building Envelope
  45. 45.A concrete supplier reduces the water content in a mix design to improve strength while keeping cement content constant. What is the most likely trade-off of this change?Site Work, Foundations and Concrete
  46. 46.A contractor is integrating a new vinyl window's nailing flange with the weather-resistant barrier (WRB) on a wood-framed wall to ensure proper drainage. Per standard flashing sequencing, in what order should the WRB and window flanges be layered, starting from the sill?Finishes and Building Envelope
  47. 47.A wall is framed with studs spaced 16 inches on center. A window rough opening requires cripple studs above the header. How should the cripple studs be spaced and aligned per standard framing practice?Framing and Carpentry
  48. 48.A soils report requires foundation backfill to be compacted to 90 percent relative compaction using mechanical tampers. To achieve uniform compaction throughout the fill depth, the contractor should place the backfill material in:Site Work, Foundations and Concrete
  49. 49.A contractor constructs a concrete retaining wall to hold back soil on a sloped lot. During construction, small pipes are embedded through the wall near the base, sloping slightly downward to daylight on the exposed face. What is the primary purpose of these weep holes?Site Work, Foundations and Concrete
  50. 50.A contractor is constructing a concrete retaining wall that will hold back saturated backfill soil. To prevent excessive hydrostatic pressure from building up behind the wall, which drainage feature should be incorporated at the base of the wall?Site Work, Foundations and Concrete