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The SC-RB exam has 110 questions and runs 6 hours.
These 10 free SC-RB questions are organized by exam domain, so you can see how each part of the South Carolina Residential Builder License Exam blueprint is tested. Reveal the answer and explanation under each question.
Ceiling joists are removed to create a vaulted room. The conventional rafters still meet at a nonstructural ridge board, and collar ties near the ridge remain intact, but the exterior walls begin to spread at the eaves. Which lost function best explains the movement?
Correct answer: B - The tension tie that resisted outward thrust from the rafters
An earthwork specification requires at least 95% relative compaction using the specified laboratory maximum dry density. The field report lists a moist density of 126.0 lb/ft³, a dry density of 115.0 lb/ft³, and a laboratory maximum dry density of 125.0 lb/ft³. All other acceptance criteria are satisfied. The next lift is ready to be placed. What does this report support?
Correct answer: A - 92.0% compaction; rework and retest before covering the lift.
For a reinforced wall pour, the approved concrete mixture uses a high-range water reducer and specifies a 5- to 7-inch slump. The measured slump is 6 inches, the recorded water content complies with the approved mixture, and the other acceptance tests are satisfactory. A crew member objects that he normally places 4-inch-slump concrete. The builder should:
Correct answer: A - Place the concrete with the specified consolidation and curing.
A leak appears only when roof runoff reaches the bottom of a roof-to-sidewall intersection. A controlled water test confirms that the shingles and the uphill step-flashing laps are sound, but runoff passes behind the siding where the roof edge meets the gutter. Which repair targets this failure?
Correct answer: B - Install kick-out flashing that diverts the runoff outward into the gutter.
A 24-ft by 30-ft slab is 4 inches thick. A 12-inch-wide perimeter thickening extends to a total depth of 16 inches below the slab surface. The drawing gives 104 ft as the closed centerline length of that thickening, and its full width lies within the slab footprint. There are no other thickenings or openings. What net concrete quantity belongs in the takeoff, before waste and rounded to the nearest 0.01 yd³?
Correct answer: B - 12.74 yd³
Roof sheathing stamped 'APA Rated Sheathing, Exposure 1' was rained on twice before the roof was dried in. The panels are now dry and flat, show no delamination or other damage, and match the approved span rating and installation details. The completed roof will protect them from weather. Which assessment of the exposure classification is justified?
Correct answer: D - Retain the panels; Exposure 1 accommodates temporary construction-weather exposure.
A listed air-conditioning condenser is marked 'Minimum Circuit Ampacity: 24 A' and 'Maximum Fuse or Circuit Breaker: 40 A.' Its dedicated circuit has conductors with a 25-A allowable ampacity after all required adjustments and a manufacturer-permitted 35-A breaker. All other installation requirements are satisfied. Based on these ratings, which correction is required?
Correct answer: D - No change to the conductor ampacity or breaker rating is required.
Before energizing a new feeder panel in the same house as the service disconnect, an electrician finds the neutral bar's bonding screw installed. The feeder has two hot conductors, a neutral, and an equipment grounding conductor. The service bonding connection is correct. Which change removes the unintended path for normal neutral current while preserving the cabinet's fault-current path?
Correct answer: A - Remove the neutral bond; keep the equipment grounding bar bonded to the cabinet.
An air conditioner's evaporator repeatedly ices after drywall sanding. The blower runs, but the return filter is matted with dust and two return grilles are covered. A technician proposes adding refrigerant. Before the charge can be evaluated reliably, service should begin by:
Correct answer: C - Thawing the coil and restoring the restricted return airflow.
After a check valve is installed at a home's water service, pressure stays at 55 psi with the water heater off but climbs to 105 psi during each heating cycle. Opening a faucet promptly returns it to 55 psi. The heater temperature controls and pressure-reducing valve have been verified to operate normally. Which addition addresses the cause of this pressure pattern?
Correct answer: C - A properly sized potable-water expansion tank on the closed system
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