Quality Control & Inspection Flashcards
7 cards from real CFB practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Quality Control & Inspection flashcards as text
A moisture barrier installed under a concrete slab-on-grade is found to have a 6-inch tear. What is the required repair procedure?
Answer: Patch with compatible vapor retarder material lapped at least 6 inches and taped at seams
Tears in vapor retarders must be patched with compatible material overlapping at least 6 inches on all sides and sealed with compatible tape to restore the barrier continuity.
During framing inspection, a field builder finds a notch cut into the middle third of the span of a load-bearing floor joist. Per IRC/IBC, this is:
Answer: Prohibited—notches in the middle third of joist spans are not permitted
Building codes prohibit notches in the middle third of joist spans because bending stress is highest there, and a notch creates a stress concentration that can cause structural failure.
Which test is used to verify the in-place compressive strength of existing concrete without extracting cores?
Answer: Schmidt (rebound) hammer test per ASTM C805
The Schmidt rebound hammer estimates surface hardness and correlates to compressive strength, providing a quick non-destructive assessment of in-place concrete without coring.
What is a 'nonconformance report' (NCR) used for in construction quality control?
Answer: Documenting work that does not comply with contract requirements and tracking corrective action
An NCR formally documents any work, material, or condition that fails to meet contract requirements and tracks the corrective action taken to resolve the deficiency.
An inspector tests field-installed spray polyurethane foam (SPF) insulation and finds thickness is 1/2 inch below specification. What is the primary concern?
Answer: The thermal resistance (R-value) will be less than specified, reducing energy performance
SPF insulation R-value is directly proportional to thickness; insufficient thickness reduces thermal performance below the design intent and may fail energy code requirements.
Which condition in a bolted steel connection requires immediate rejection during field inspection?
Answer: Bolts with the threads in the shear plane on a slip-critical connection
Threads in the shear plane of a slip-critical connection significantly reduce the connection's load-carrying capacity and must be corrected by installing the bolt with threads excluded from the shear plane.
During a rooftop inspection after heavy rain, ponding water is observed standing 48 hours after the storm ended. Per ASCE 7, this represents what concern?
Answer: A progressive collapse risk because ponding water adds load that deflects the roof, allowing more water to accumulate
ASCE 7 recognizes ponding instability: water weight deflects the roof, creating a deeper depression that collects more water, potentially leading to progressive overload and collapse.