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The RWC exam has 60 questions and runs 4 hours.
These 10 free RWC questions are organized by exam domain, so you can see how each part of the Registered Waterproofing Consultant blueprint is tested. Reveal the answer and explanation under each question.
The movement submittal for a liquid-applied membrane contains one result: 500% free-film elongation at 23°C. Hydrostatic resistance and substrate compatibility are already established. For concrete cracks that repeatedly open 1.5 mm at -15°C, the decisive additional qualification is:
Correct answer: A - Cyclic crack-bridging results for the specified opening, temperature, and film thickness.
During liquid-membrane application, a valid wet-film measurement is 72 mils. The product has 75% solids by volume and 90% solids by weight; the specified minimum dry film is 60 mils. The manufacturer permits wet-film adjustment up to 90 mils before skin formation, which has not begun. Which instruction is appropriate?
Correct answer: B - Increase the still-wet film to 80 mils, then recheck thickness.
A paver plaza over occupied offices drains quickly at the walking surface, but water remains in the bedding layer after rain. Inspection confirms that the waterproofing slopes toward the drains and that the drain bodies have no inlet below the finish-level grates. Which correction addresses the trapped water?
Correct answer: B - Provide membrane-level drain inlets connected to the sub-paver drainage layer.
At a property line, a basement wall will be cast directly against permanent shoring. Exterior excavation will not be possible after the pour. The design requires a barrier that intercepts groundwater before it enters the structural concrete. Select the construction sequence that can deliver that requirement.
Correct answer: A - Install and inspect pre-applied waterproofing against the shoring, then cast the wall.
The geotechnical design groundwater elevation is 102.0 ft. Temporary pumping holds construction-stage groundwater at 91.0 ft. The main slab waterproofing is at elevation 96.0 ft, and the elevator-pit waterproofing is at 92.0 ft. Using 0.433 psi per foot of freshwater head, what unfactored gauge pressure governs the pit waterproofing check?
Correct answer: C - 4.33 psi
Select the lowest ASTM C920 movement class for a joint installed at 20 mm that will range from 17 mm to 24 mm in service. The dimensions include tolerances and all required movement allowances. Substrate adhesion, use ratings, and joint geometry are satisfactory for every candidate.
Correct answer: B - Class 25
Deep monitoring wells show the regional water table below a basement throughout the year. After prolonged rain, a shallow piezometer in permeable backfill records water above the wall-to-slab joint. Borings identify a continuous, low-permeability clay layer beneath that backfill. Which groundwater condition should the waterproofing design account for?
Correct answer: D - Perched groundwater producing local hydrostatic exposure above the regional water table.
During solvent-primer application in a permit-required service pit on a U.S. construction site, the attendant sees a calibrated monitor rise to 18% of the solvent's lower flammable limit. Oxygen remains at 20.9%. Both workers are alert and have a clear exit. Under OSHA construction confined-space requirements, what takes priority?
Correct answer: C - Evacuate the pit and suspend entry until safe entry conditions are reestablished.
Three valid pull-off tests on a cured membrane over concrete produce 180, 195, and 210 psi. Each fracture lies entirely within sound concrete, with the membrane-to-concrete interface intact. The project accepts results of at least 150 psi and expressly permits cohesive concrete failure above that value. How should these locations be recorded?
Correct answer: D - Accepted, with the measured strengths and cohesive concrete failure reported.
A planned low-voltage electronic leak survey will test an electrically insulating membrane over an electrically insulating cover board and rigid insulation. The steel deck below will be connected to the instrument ground, but the assembly contains no other conductive layer. Before membrane installation, which revision would provide the missing test-current return path?
Correct answer: C - Add a compatible conductive layer directly beneath the membrane, connected to the test ground.
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