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CSLB General Building (B) practice questions

213 free questions with answers and explanations.

Practice test
  1. 101.A structural plan calls for #6 rebar (3/4-inch diameter) to be spliced with a lap length of 40 bar diameters in a footing. What is the required minimum lap splice length?Site Work, Foundations and Concrete
  2. 102.A contractor needs to order ready-mix concrete for a rectangular footing measuring 30 feet long, 2 feet wide, and 1 foot deep. How many cubic yards of concrete should be ordered (rounded up to the nearest quarter yard)?Site Work, Foundations and Concrete
  3. 103.A header spanning 16 feet over a garage door opening supports a uniform load of 400 pounds per linear foot from the roof structure above. Treating the header as a simply supported beam, what reaction load is transferred to each of the jack studs at the ends of the header?Framing and Carpentry
  4. 104.A wall assembly for a Title 24 energy calculation includes R-13 fiberglass batt insulation between studs, R-5 continuous rigid foam sheathing over the exterior, and a combined R-2 contribution from interior/exterior air films and finish materials. What is the approximate total R-value of the wall assembly?Finishes and Building Envelope
  5. 105.A contractor is placing a 4-inch-thick interior concrete slab-on-grade and must determine control joint spacing to minimize random shrinkage cracking. Using the standard industry rule of thumb, what is the maximum recommended joint spacing?Site Work, Foundations and Concrete
  6. 106.A residential contractor is pouring a continuous footing for a single-story wood-framed addition in an area with no special frost concerns. Per the California Building Code, what is the minimum required depth of footing below the lowest adjacent undisturbed ground surface?Site Work, Foundations and Concrete
  7. 107.A framer is selecting lumber for wall studs in a two-story load-bearing exterior wall. Which lumber grade designation is appropriate for this application?Framing and Carpentry
  8. 108.A framer proposes substituting coarse-thread deck screws for the 8d common nails specified in the approved shear wall nailing schedule, believing screws provide equal or greater holding power. Is this substitution acceptable without further approval?Framing and Carpentry
  9. 109.A contractor is replacing a wood window in a stucco wall and installs a sloped, self-adhering sill pan flashing beneath the new window before setting it in the rough opening. What is the primary purpose of this sill pan flashing?Finishes and Building Envelope
  10. 110.A drywall installer is finishing a one-hour fire-rated corridor wall required by code. Which type and thickness of gypsum board is typically specified to achieve this rating?Finishes and Building Envelope
  11. 111.A contractor is selecting replacement windows for a new home in a California climate zone with high summer cooling loads. To minimize solar heat gain through the glazing while meeting Title 24 prescriptive requirements, which window rating should the contractor prioritize being as LOW as possible?Finishes and Building Envelope
  12. 112.A designer compares a solid-sawn 2x10 No. 2 Douglas fir-larch joist to an LVL (laminated veneer lumber) member of the same nominal depth for a long floor span. Why can the LVL typically span farther under the same loading?Framing and Carpentry
  13. 113.A general contractor is scheduling rough-in work for a new single-family residence. Which sequence best reflects the standard order of rough-in operations after framing is complete?Mechanical, Electrical, Plumbing Coordination
  14. 114.A contractor is installing a #4 rebar dowel (1/2-inch diameter) to connect a new concrete slab to an existing foundation wall, using the general rule of thumb development length of 40 times the bar diameter for uncoated bars in normal-weight concrete. What minimum embedment length should the dowel have into the existing concrete?Site Work, Foundations and Concrete
  15. 115.A homeowner is comparing replacement windows and notices one has a lower U-factor than another on its NFRC label. What does this indicate about the window's performance?Finishes and Building Envelope
  16. 116.A roof truss package originally designed for 16-inch on-center spacing is field-adjusted by the framing crew to 24-inch on-center spacing to save material. What additional change is required to maintain proper roof sheathing performance?Framing and Carpentry
  17. 117.A roofer is installing underlayment on a roof plane with a slope of 3:12. Per California Residential Code roofing provisions, what underlayment application is required for this slope?Finishes and Building Envelope
  18. 118.A contractor frames a stairway with tread depths (run) of exactly 10 inches, the code minimum. To help compensate, the treads are given a nosing that projects beyond the riser below. What is the required nosing projection range for treads with less than 11 inches of run?Framing and Carpentry
  19. 119.A framer must choose lumber for a long-span floor joist carrying a heavy point load, comparing Douglas fir-larch Select Structural grade to No. 2 grade of the same size. What is the primary reason Select Structural allows for a longer allowable span under the same load?Framing and Carpentry
  20. 120.During a shear wall inspection, the building inspector rejects a wall panel because many of the 8d common nails along the panel edges were driven so deep that the nail heads broke through the sheathing surface. Why does this cause a code violation?Framing and Carpentry
  21. 121.An engineer specifies Structural I plywood, rather than standard sheathing-grade plywood, for shear wall panels in a high seismic design category. What is the primary structural reason for this specification?Framing and Carpentry
  22. 122.A crew is placing a concrete slab on a day when the ambient temperature is 98°F with low humidity and moderate wind. Per ACI 305 hot weather concreting guidance, which practice is most important to prevent plastic shrinkage cracking?Site Work, Foundations and Concrete
  23. 123.An inspector checks anchor bolts securing a sill plate to the foundation in a high seismic design category. Per code requirements for these conditions, what size plate washer must be installed under each anchor bolt nut?Framing and Carpentry
  24. 124.A framer is instructed by the job superintendent to use '16d' common nails for wall plate connections. What does the number '16' indicate about the nail?Framing and Carpentry
  25. 125.During framing, the plumber discovers that a required 4-inch drain vent stack conflicts with a structural engineered floor joist that cannot be cut or notched per the manufacturer's specifications. What is the correct course of action?Mechanical, Electrical, Plumbing Coordination
  26. 126.A framer notches a 2x6 bearing wall stud to install a plumbing supply line. The stud is 5.5 inches wide. Per code, what is the maximum allowable notch depth in this bearing wall stud?Mechanical, Electrical, Plumbing Coordination
  27. 127.A concrete finisher is placing rebar in a slab-on-grade and uses plastic rebar chairs before the pour. What is the primary purpose of these chairs?Site Work, Foundations and Concrete
  28. 128.A contractor is framing an interior stairway in a single-family residence under the California Residential Code (CRC). What is the maximum allowable riser height for this stairway?Framing and Carpentry
  29. 129.A contractor is bracing a two-story wood-framed house in a high seismic design category. Per prescriptive braced wall line requirements, what is the maximum allowable spacing between braced wall panels along a braced wall line?Framing and Carpentry
  30. 130.A stucco contractor is installing a weep screed at the base of an exterior wall over a concrete foundation. Per code, what is the minimum clearance required between the bottom of the weep screed and earth (grade)?Finishes and Building Envelope
  31. 131.A framing crew installs a double top plate on an interior bearing wall, but the lap splice at a wall corner measures only 12 inches. Per conventional light-frame construction requirements, what is the minimum required lap length for a top plate splice?Framing and Carpentry
  32. 132.A geotechnical report indicates that a soil sample from a building site has an Expansion Index (EI) of 75, determined using standard laboratory testing. According to typical classification tables used in California soils reports, this soil would be categorized as having:Site Work, Foundations and Concrete
  33. 133.A framer builds a rough opening for a window and installs king studs on both sides but omits the jack (trimmer) studs beneath the header, letting the header rest directly on the sole plate. What structural problem does this create?Framing and Carpentry
  34. 134.A framer is installing a built-up wood header over a 9-foot-wide garage door opening in an exterior bearing wall. Compared to a 4-foot window opening in the same wall, why does the wider opening require more jack studs (trimmers) at each end?Framing and Carpentry
  35. 135.A stucco contractor is applying traditional three-coat (hard-coat) stucco over metal lath on a new wood-framed exterior wall. What is the correct sequence of the three coats?Finishes and Building Envelope
  36. 136.According to the California Residential Code, fire blocking is required vertically in concealed stud wall spaces at a maximum interval of how many feet?Mechanical, Electrical, Plumbing Coordination
  37. 137.A contractor is building a house in California Climate Zone 16 (a cold mountain climate) and is deciding whether to install an interior vapor retarder behind the drywall on exterior walls. In this climate zone, why is an interior-side vapor retarder generally appropriate, whereas it would be discouraged in most other California climate zones?Finishes and Building Envelope
  38. 138.A drywall contractor is hanging gypsum board on a corridor ceiling that runs 62 feet in a straight, unbroken line with no doors or perimeter relief joints. Per ASTM C840 requirements, no single field of gypsum board should exceed 30 feet without a control joint. What is the minimum number of control joints required for this run?Finishes and Building Envelope
  39. 139.A footing is being poured in direct contact with earth (no formwork on the bottom). According to standard concrete reinforcement practice, what is the minimum required concrete cover over rebar for this condition?Site Work, Foundations and Concrete
  40. 140.An electrician is installing a new panelboard in a garage, and the plumber wants to route a vent stack directly above the panel location. Per NEC working clearance requirements, what is the primary conflict that must be resolved before finalizing the plumbing layout?Mechanical, Electrical, Plumbing Coordination
  41. 141.A contractor has completed excavation and placed the rebar for a foundation footing. Before proceeding to pour concrete, which inspection must be requested and approved?Planning and Estimating
  42. 142.A homeowner hires a licensed contractor to build a new detached garage. Before any construction begins, who is responsible for obtaining the building permit from the local building department?Planning and Estimating
  43. 143.A continuous footing is 81 feet long, 12 inches wide, and 8 inches deep. How many cubic yards of concrete are needed to pour this footing?Planning and Estimating
  44. 144.A floor plan is drawn at a scale of 1/4 inch = 1 foot. A contractor measures an interior wall on the drawing and finds it to be 3 inches long. What is the actual length of the wall?Planning and Estimating
  45. 145.A framer is estimating studs for a 100-linear-foot wall using 16-inch on-center spacing, and will add a 10% waste factor for cuts and corners. Approximately how many studs should be ordered?Planning and Estimating
  46. 146.A concrete slab measures 40 feet by 30 feet and will be poured 4 inches thick. Rounding up to the nearest whole cubic yard, how much concrete should be ordered?Planning and Estimating
  47. 147.A contractor obtains a building permit for a room addition but is delayed by a client dispute, causing all work to stop for an extended period. Under the California Building Code, after how many consecutive days of suspended work does the permit become invalid, requiring a new permit to resume construction?Planning and Estimating
  48. 148.A project scheduler wants a visual tool that displays each construction task as a horizontal bar along a timeline, showing start and finish dates for framing, roofing, and drywall. Which scheduling tool best serves this purpose?Planning and Estimating
  49. 149.A carpenter needs to order lumber for 20 pieces of 2x8 boards, each 12 feet long. Using the standard board foot formula, how many board feet of lumber are required?Planning and Estimating
  50. 150.On a CPM schedule, the critical path through the project totals 20 days. A parallel sequence of activities (Path B) that must also be completed totals 15 days. What is the total float available for Path B?Planning and Estimating