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CSLB General Building (B) practice questions

213 free questions with answers and explanations.

Practice test
  1. 51.A geotechnical technician performs a sand cone test on compacted fill at a foundation site and determines the in-place dry density of the soil is 112 pounds per cubic foot. The laboratory Proctor test established a maximum dry density of 120 pounds per cubic foot for this soil. If the specifications require 90 percent relative compaction, does the fill pass?Site Work, Foundations and Concrete
  2. 52.A framer installs rafter ties across a roof to resist the outward thrust created by the rafters pushing on the exterior walls. According to standard framing practice, where should rafter ties generally be located along the rafter height for maximum effectiveness?Framing and Carpentry
  3. 53.During a shear wall inspection, the building inspector confirms that hold-down anchors are properly installed at both ends of a shear wall segment. What is the primary structural purpose of these hold-down devices?Framing and Carpentry
  4. 54.A contractor is comparing draft stopping to fire blocking. Which statement correctly distinguishes the two?Mechanical, Electrical, Plumbing Coordination
  5. 55.A contractor is installing 5/8-inch Type X gypsum board on a garage ceiling that requires a one-hour fire-rated assembly, with framing spaced 24 inches on center. What is the maximum required screw spacing along the field of the board (not at edges)?Finishes and Building Envelope
  6. 56.A contractor is placing a concrete footing and overnight temperatures are forecast to drop below freezing before the concrete has cured. According to standard cold-weather concreting practices (ACI 306), what minimum concrete temperature must be maintained, and for how long, to protect the fresh concrete?Site Work, Foundations and Concrete
  7. 57.A contractor is framing a winder staircase where treads narrow toward the inside of the turn. Per building code, what is the minimum required tread depth at the narrow (walk line inner) end of a winder tread?Framing and Carpentry
  8. 58.A contractor is selecting a vapor retarder membrane for a wall assembly and reviews a manufacturer's data sheet showing a permeance rating of 0.5 perms. According to standard vapor retarder classifications used in building codes, how is this material classified?Finishes and Building Envelope
  9. 59.A crew is excavating a 10-foot-deep trench in Type B soil and wants to use the benching method instead of sloping the trench walls back at an angle. According to OSHA/Cal-OSHA excavation rules, in which soil types is benching a permitted protective method?Site Work, Foundations and Concrete
  10. 60.A contractor pours a concrete footing and needs to know when it is safe to strip the wooden side forms without damaging the concrete. Assuming normal curing conditions (moderate temperature, no admixtures), what is a generally accepted minimum time before form removal for non-load-bearing footing forms?Site Work, Foundations and Concrete
  11. 61.A trench is being excavated to a depth of 8 feet. Per OSHA/Cal-OSHA excavation safety standards, how far from the edge of the excavation must excavated soil (spoil) be placed?Site Work, Foundations and Concrete
  12. 62.A building inspector measures the headroom in a straight residential stairway as 79 inches, taken vertically from a line connecting the nosings of the treads to the ceiling above. Does this stairway comply with the California Residential Code minimum headroom requirement?Framing and Carpentry
  13. 63.A soils report for a site with highly expansive clay recommends supporting the foundation walls on a system of drilled concrete piers connected by reinforced horizontal concrete beams that span between the piers, keeping the structure elevated above the expansive soil. What is this structural element called?Site Work, Foundations and Concrete
  14. 64.A concrete testing lab collects samples from a footing pour where the specified strength is f'c = 3,000 psi. Three consecutive 28-day compressive strength test results are 3,200 psi, 2,900 psi, and 3,100 psi. Under standard ACI acceptance criteria, how should this concrete be evaluated?Site Work, Foundations and Concrete
  15. 65.A carpenter examines a grade stamp on a piece of framing lumber that reads 'S-DRY.' What does this designation indicate about the lumber?Framing and Carpentry
  16. 66.A concrete slab is being poured around a steel support column that will remain in place permanently. To prevent the slab from cracking as it shrinks and moves independently of the rigid column, the contractor installs a joint that fully separates the slab from the column with a compressible filler. What type of joint is this?Site Work, Foundations and Concrete
  17. 67.A roofer is flashing the point where a sloped composition shingle roof meets a sidewall and terminates directly above a gutter, rather than continuing as a full step-flashed run up the wall. Which flashing detail is required at this transition to prevent water from running behind the gutter end cap and into the wall?Finishes and Building Envelope
  18. 68.An engineer specifies a shear wall using blocked plywood panels rather than unblocked panels for the same nail size and spacing. What is the primary structural benefit of blocking the panel edges?Framing and Carpentry
  19. 69.A residential stairway has a total horizontal run of 99 inches distributed evenly over 9 equal treads. Per the California Residential Code, what is the run (depth) of each tread, and does the stairway comply with the minimum tread run requirement?Framing and Carpentry
  20. 70.A roofing contractor is selecting an underlayment product for a steep-slope composition shingle roof and wants a self-adhering, rubberized asphalt membrane suitable for use in valleys and eaves rather than standard felt. Which ASTM standard governs this type of self-adhering underlayment?Finishes and Building Envelope
  21. 71.A crew is preparing to enter a 6-foot-deep trench to install a sewer lateral in Type C soil. According to Cal/OSHA excavation safety requirements, what must be provided before workers enter the trench?Site Work, Foundations and Concrete
  22. 72.What is the primary purpose of fire blocking in a wood-framed residential structure?Mechanical, Electrical, Plumbing Coordination
  23. 73.During a shear wall inspection, an inspector checks nail placement on the plywood sheathing panel edges. Nails placed too close to a panel edge risk splitting the wood and reducing shear capacity. What is the minimum standard edge distance for nails along sheathing panel edges?Framing and Carpentry
  24. 74.A framer notches a top plate 2-1/2 inches deep to run a 2-inch water pipe through a wall where the plate is 3-1/2 inches wide. Since the notch removes more than 50% of the plate's width, what does code require to maintain the wall's structural continuity?Framing and Carpentry
  25. 75.A roofing crew is installing 15/32-inch plywood roof sheathing over rafters spaced 24 inches on center. Per typical code nailing schedules for roof sheathing, what nail spacing is required at panel edges versus the field of the panel?Framing and Carpentry
  26. 76.A designer specifies a 2x12 floor joist spanning 18 feet, and the applicable code requires that live load deflection not exceed L/360. What is the maximum allowable deflection for this joist?Framing and Carpentry
  27. 77.A builder compares two floor framing layouts using the same Douglas fir-larch No. 2, 2x10 joists and the same live load. One layout spaces joists at 16 inches on center; the other spaces them at 24 inches on center. What effect does increasing the spacing from 16 to 24 inches on center have on the maximum allowable span per standard joist span tables?Framing and Carpentry
  28. 78.A structural plan calls for Grade 60 reinforcing steel to be used in a footing. What does the designation "Grade 60" specify about this rebar?Site Work, Foundations and Concrete
  29. 79.A truss manufacturer's design drawings specify continuous lateral bracing on the bottom chord of a series of roof trusses at 10-foot intervals to prevent buckling. During construction, a framer decides to omit this bracing because the trusses appear stable once sheathed on top. What is the risk of this decision?Framing and Carpentry
  30. 80.During a rough-in inspection, the inspector notes that the concealed space between the stair stringers and the wall was not sealed at the top and bottom of the stair run. What code requirement was violated?Mechanical, Electrical, Plumbing Coordination
  31. 81.A framer notices that an interior partition wall runs parallel to and directly above the floor joists below, landing between two joist bays rather than aligning with a joist. What framing solution is required to properly support this partition?Framing and Carpentry
  32. 82.A stairway has a total vertical rise of 108 inches from the lower finished floor to the upper finished floor. Using the CRC maximum riser height of 7 3/4 inches, what is the minimum number of risers required, and what is the resulting actual riser height when the rise is divided evenly?Framing and Carpentry
  33. 83.A roofing crew is installing composition shingle roofing on a new residence and placing drip edge metal along both the eaves and the rake edges. Per standard California roofing practice, how should the drip edge be installed relative to the underlayment at each location?Finishes and Building Envelope
  34. 84.A contractor is installing a curb-mounted skylight on a composition shingle roof. Per code requirements for skylight curb construction, what is the minimum height the curb must extend above the plane of the roofing material?Finishes and Building Envelope
  35. 85.A contractor is designing formwork for a concrete wall pour and increases the rate of concrete placement significantly to speed up the job. What effect does this faster placement rate have on the formwork design requirements?Site Work, Foundations and Concrete
  36. 86.A framing crew is installing 23/32-inch plywood subfloor panels over floor joists using 8d common nails per standard prescriptive nailing requirements. What nailing schedule should they follow?Framing and Carpentry
  37. 87.Before excavation begins on a new residential foundation, a surveyor sets up wooden batter boards with string lines at each corner of the building. What is the main purpose of batter boards?Site Work, Foundations and Concrete
  38. 88.A crew resumes pouring a concrete wall the next morning after the previous day's concrete has already begun to set. The interface between the two placements shows visible discontinuity and reduced bond strength. What defect has occurred?Site Work, Foundations and Concrete
  39. 89.An electrician bores a hole through the center of a 2x4 stud for NM cable, and the hole edge ends up located 3/4 inch from the face edge of the stud. According to NEC requirements as applied in residential wiring, what must be installed to protect the cable?Mechanical, Electrical, Plumbing Coordination
  40. 90.A general contractor is scheduling inspections for a new residence before insulation and drywall installation begin. Which sequence correctly reflects standard rough-in inspection order?Mechanical, Electrical, Plumbing Coordination
  41. 91.A carpenter is framing a roof and must decide between installing a ridge board and a ridge beam. Which statement correctly distinguishes the two elements?Framing and Carpentry
  42. 92.A three-story custom home has a continuous combustible soffit and cornice running the full length of the exterior wall. Per fire blocking requirements, concealed spaces behind such combustible construction must be blocked at intervals not exceeding:Mechanical, Electrical, Plumbing Coordination
  43. 93.A designer compares two floor beam options for the same 14-foot span and load: one in Douglas fir-larch No. 1 and one in Hem-fir No. 1, which has a lower allowable bending stress (Fb) than Douglas fir-larch. If both beams must use the same nominal width and depth, what is the most likely outcome of substituting Hem-fir for Douglas fir-larch?Framing and Carpentry
  44. 94.A contractor is installing standard three-tab composition (asphalt) shingles on a garage addition. Per the California Residential Code, what is the minimum roof slope allowed for shingle application using a single layer of underlayment?Finishes and Building Envelope
  45. 95.A contractor is sizing attic ventilation for a home and providing both ridge (exhaust) and soffit (intake) vents. Per standard ventilation balance practice, how should the net free ventilation area typically be distributed between intake and exhaust vents?Finishes and Building Envelope
  46. 96.A contractor is placing a concrete slab-on-grade over native soil in a residential slab pour. What is the primary purpose of installing a polyethylene vapor barrier beneath the slab?Site Work, Foundations and Concrete
  47. 97.During a trench excavation, a soils engineer classifies the soil as Type A under OSHA/Cal-OSHA excavation standards. Which characteristic best describes Type A soil?Site Work, Foundations and Concrete
  48. 98.Under California's Title 24 Part 6 prescriptive requirements, a new low-slope (flat) roof in most climate zones must meet a minimum aged solar reflectance to qualify as a 'cool roof.' What is that minimum aged solar reflectance value?Finishes and Building Envelope
  49. 99.A continuous wall footing must support a wall load of 4,000 pounds per linear foot. The soil at the site has an allowable bearing capacity of 2,000 pounds per square foot. What minimum footing width is required?Site Work, Foundations and Concrete
  50. 100.A building inspector checks a two-story stud wall and requires fireblocking be installed in concealed vertical spaces. What is the maximum vertical interval allowed between fireblocking in a wood-framed stud wall per the California Residential Code?Framing and Carpentry