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The CBES-AMB exam has 84 questions and runs 2 hours 30 minutes.
These 10 free CBES-AMB questions are organized by exam domain, so you can see how each part of the Certified Building Envelope Specialist - Air & Moisture Barrier blueprint is tested. Reveal the answer and explanation under each question.
Before approving an air-barrier system, a reviewer needs evidence that its sheet, joint treatments, fasteners, and transitions function together after conditioning. The supplier has submitted only an ASTM E2178 material report. Which additional submittal addresses that gap?
Correct answer: A - ASTM E2357 results for a representative assembly with the proposed details
Commissioning measurements show 35 cfm at a bathroom exhaust grille; the project requires at least 50 cfm. The fan is rated at 80 cfm, the bathroom door is open, and the outdoor terminal is clear. Inspection finds a crushed section of flexible exhaust duct. Which work order should be issued first?
Correct answer: A - Correct the crushed duct and remeasure the installed exhaust airflow.
The enclosure drawings designate the exterior wall membrane and the sealed roof deck as the air-control layers. At the parapet, the installed transition connects the wall membrane to the metal coping instead; the roof deck remains disconnected. Which revision closes the missing air-control connection?
Correct answer: B - Connect the wall membrane to the deck with a flexible air-barrier transition.
A whole-building test measures 7,200 cfm at 75 Pa. The contract limits leakage to 0.40 cfm/ft² of enclosure area, defined as exterior walls plus roof plus ground-contact slab. Those areas are 6,000 ft², 9,000 ft², and 9,000 ft², respectively. Select the valid compliance statement for this result.
Correct answer: A - 0.30 cfm/ft²; the specified enclosure-leakage limit is met.
During a dry winter cold spell, roof sheathing becomes wet beside unsealed ceiling penetrations, while adjacent sealed bays remain dry. Indoor air has a dew point of 12°C; the sheathing is at 5°C. Smoke confirms airflow from the rooms into the roof cavity. What mechanism best explains the localized wetting?
Correct answer: D - Air-transported indoor moisture condensing on the cold sheathing
At the specified thickness, a humidity-responsive membrane has ASTM E96/E96M results of 0.5 U.S. perm under dry-cup conditions and 12 U.S. perms under wet-cup conditions. Which description correctly combines its dry-cup vapor-retarder class with its behavior in the wetter test?
Correct answer: C - Class II in the dry-cup test; less resistant to vapor passage in the wet-cup test
A pinless moisture scanner reads 80 on its 0-100 relative scale over gypsum in a wood-framed wall beside metal window trim. There is no visible staining. A contractor compares that number with the project's 16% wood-moisture limit and proposes removing the wall lining. What should the investigator do before determining the repair scope?
Correct answer: D - Check for metal interference, then confirm framing moisture with corrected pin readings.
A precast-panel sealant joint tears during a movement test. Its width and depth are correct, and the specified movement is within the sealant's rated capacity. A cut section shows that the bead bonded to both panel faces and to the rigid filler behind it. Which change addresses the installation defect?
Correct answer: C - Install compatible nonbonding backing behind the replacement sealant.
At a window head, the wall's water-resistive barrier (WRB) passes behind the vertical leg of the metal head flashing. The project requires a shingle-lapped drainage plane, with no face-taped alternative at this junction. The correction needed to restore that drainage path is to:
Correct answer: B - Rework the upper WRB so it laps over the flashing's vertical leg.
An open vertical façade joint cures at a width of 20 mm. Its anticipated width, including design tolerances, ranges from 16 to 26 mm. The sealant will be gunned and tooled without forms and must accept the specified paint. All four candidates are compatible with the joint substrates and backing. Which candidate satisfies the combined requirements?
Correct answer: B - ASTM C920 Grade NS, Class 35; approved for the specified paint
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