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 CMCC exam has 120 questions and runs 3 hours.
These 10 free CMCC questions are organized by exam domain, so you can see how each part of the Council-certified Moisture Control Consultant blueprint is tested. Reveal the answer and explanation under each question.
An electric heater raises the air temperature in a drying enclosure from 68°F to 86°F. Relative humidity falls from 60% to 33%, while the dew point remains approximately 54°F and barometric pressure is unchanged. A technician says the heater has removed nearly half the moisture from the air. What do the readings actually establish?
Correct answer: C - The humidity ratio is essentially unchanged despite the lower relative humidity.
On a cool, misty morning, a warehouse measures 80°F and 50% RH indoors, with a dew point of approximately 60°F. Outdoor air is 50°F and 90% RH, with a dew point of approximately 47°F. Adequate heating and safe outdoor-air exchange are available. The owner objects to ventilation because the outdoor RH is higher. Which assessment is correct?
Correct answer: B - Outdoor air can remove moisture because its dew point is lower.
A grading survey records soil elevation 100.00 ft at a foundation and 99.80 ft at a point 10 ft horizontally away. The project requires a uniform slope of at least 5% away from the building over that distance. The cladding already has its minimum permitted clearance above the soil, and positive drainage is available beyond the outer point. Which proposed grading change satisfies both the slope and clearance constraints?
Correct answer: B - Retain the wall-side grade at 100.00 ft; lower the outer grade to 99.40 ft.
Water enters a basement at the floor-to-wall joint after prolonged rain. Surface grading and roof runoff have been corrected. The exterior wall membrane is intact, and the footing drain discharges freely, but the entire drainpipe is above the basement floor elevation. Which design correction addresses the remaining groundwater vulnerability?
Correct answer: D - Lower the drain so its top is below the slab underside.
A controlled water test reproduces leakage above a window. An inspection opening reveals that water descending the wall's water-resistive barrier passes behind the head flashing: the flashing's upper leg is installed over the barrier, with its top edge unsealed. The flashing itself is intact. Which repair restores the intended drainage path?
Correct answer: A - Lap the wall's water-resistive barrier over the head flashing's upper leg.
During several continuously freezing days, snow melts over the heated rooms of a house but remains at the cold eaves, where an ice ridge forms. The vented attic has open soffit and ridge vents, substantial air leaks at ceiling penetrations, and thin insulation near the eaves. Which retrofit addresses the identified cause of the melting rather than simply managing the resulting water?
Correct answer: C - Seal ceiling bypasses and restore insulation without blocking eave ventilation.
The ceiling below a tiled shower leaks during use. Supply piping passes a pressure test. Running water at the normal shower flow rate through a hose into the drain throat, bypassing the receptor and its drain-flange connection, produces no leak. With the shower supply off, controlled wetting of the shower walls and receptor reproduces the drip. Where should the next localized inspection be directed?
Correct answer: A - The receptor waterproofing and its wall and drain connections.
An office has design cooling loads of 24,000 Btu/h sensible and 8,000 Btu/h latent. The listed net cooling capacities apply at the specified project operating conditions. Sensible heat ratio (SHR) is sensible capacity divided by total cooling capacity. Which equipment selection has sufficient capacity for BOTH loads at this design point?
Correct answer: B - Total capacity: 36,000 Btu/h; SHR: 0.70.
A contractor recommends removing wallboard after a pinless moisture meter gives high readings along a narrow vertical strip. The strip coincides with metal corner bead; adjacent gypsum board reads low and shows no swelling or softness. Before authorizing removal, the consultant should:
Correct answer: D - Use pin measurements clear of metal, with matching dry gypsum for comparison.
A restoration crew finds standing water in a basement touching wall receptacles and a power strip. Circuit status is unconfirmed, and the electrical panel can be reached only by crossing the water. Extraction equipment is ready at the dry doorway. What must happen before anyone enters the water?
Correct answer: D - Have qualified personnel isolate power and verify deenergization from a dry location.
The CMCC exam also covers these domains. Drill them in the full free practice test:
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