10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The LA-CBC exam has 80 questions and runs 3 hours.
These 10 free LA-CBC questions are organized by exam domain, so you can see how each part of the Louisiana Commercial Contractor Building Construction Exam blueprint is tested. Reveal the answer and explanation under each question.
A fill specification requires at least 95% compaction relative to ASTM D1557 Modified Proctor. The field test reports 126 pcf wet density and 119 pcf dry density. The laboratory report lists 121 pcf for Standard Proctor and 124 pcf for Modified Proctor. Which conclusion is supported?
Correct answer: D - It passes at about 96.0% of Modified Proctor MDD
An unbonded post-tensioning tendon has a calculated elongation of 8.00 inches and a measured elongation of 7.52 inches. Concrete strength is verified, the jack calibration is current, and no abnormal cracking or anchorage distress is observed. The stressing procedure accepts variance within ±7%. Which disposition is appropriate?
Correct answer: D - Record it for acceptance; the −6% variance is within tolerance
A floor slab placed at the specified water-cementitious ratio is power-troweled while a continuous bleed-water sheen remains. After curing, the surface powders under light traffic. What most likely caused the defect?
Correct answer: B - Working bleed water into the surface created weak paste
During a controlled water test, leakage appears at both jambs of a masonry-veneer window. Through-wall flashing is present above the lintel and the weeps are open, but the flashing terminates flat at each jamb without end dams. Which correction targets the actual defect?
Correct answer: A - Install end dams and restore the flashing drainage path
An erection drawing specifies a slip-critical bolted joint. The correct high-strength bolt assemblies are on site, but the faying surfaces received a smooth topcoat that is not approved for the specified slip coefficient. Which statement correctly addresses the connection?
Correct answer: C - Slip-critical joints require qualified faying surfaces as well as pretension
A conventionally framed gable roof has a vaulted ceiling with no ceiling joists or rafter ties. The ridge is only a nonstructural ridge board, and the exterior walls are beginning to spread. The open-ceiling design must be preserved. What permanent framing change is appropriate?
Correct answer: C - Install a structural ridge beam with posts to the foundation
A roof has a 3:12 slope and will receive asphalt shingles. The adopted code is the 2018 IBC, the shingle manufacturer permits installation down to 2:12, and the contract is not more restrictive. How should the underlayment be applied?
Correct answer: B - Use the prescribed double-underlayment application for slopes below 4:12
After heavy rain, water begins entering a 7-foot trench, a tension crack opens near the edge, and the trench box shifts. Repositioning the box would require an employee to stand between the shield and the trench face. What is the immediate action?
Correct answer: A - Evacuate the trench until a competent person reevaluates and corrects the hazards
The structural plan identifies a beam as W12×26, while the enlarged connection detail identifies the same beam mark as W12×40. Fabrication has not begun. What should the contractor do before releasing the member?
Correct answer: B - Hold the affected member and obtain written clarification through an RFI
A Group A-2 restaurant contains 1,260 square feet net of dining area at 15 square feet per occupant and 620 square feet gross of commercial kitchen at 200 square feet per occupant. Fractions are rounded up. A swinging, latching exit-access door serves the combined area. Which result is correct under the 2018 IBC?
Correct answer: D - 88 occupants; egress-direction swing and panic hardware are both required
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