Quality Control & Inspection Flashcards
7 cards from real CRC 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 contractor is performing a quality control review of electrical rough-in. Which of the following is a common deficiency that should be flagged?
Answer: Cables passing through bored holes without protection within 1.25 inches of the stud edge
NEC 300.4 requires a nail plate to protect cables when the edge of a bored hole is within 1-1/4 inches of the face of the framing member.
What is the purpose of a mock-up panel in residential construction quality control?
Answer: To establish an approved standard of workmanship that field work must match
A mock-up establishes an agreed-upon benchmark of acceptable quality for finishes, materials, or assemblies before full-scale installation begins.
During a quality inspection of a roof truss installation, the inspector notices several trusses have been field-cut to fit around a chimney chase. This is:
Answer: A serious deficiency requiring engineer approval before proceeding
Trusses are engineered components; field modifications must be evaluated and approved by the truss engineer of record before the structure can be considered safe.
Which ASTM standard governs the minimum compressive strength testing of concrete cylinders used to verify residential foundation concrete quality?
Answer: ASTM C39
ASTM C39 is the standard test method for compressive strength of cylindrical concrete specimens and is the primary QC test for verifying design strength.
A residential contractor's QC program should require that drywall screws used for 1/2-inch drywall on wood framing be driven to what depth standard?
Answer: Slightly dimpled without breaking the paper face
Proper drywall screw installation creates a slight dimple without tearing the paper face; breaking the paper reduces holding power and creates a finishing defect.
When conducting a pre-drywall inspection, which structural element is most critical to verify before walls are closed in?
Answer: Proper installation of blocking for future grab bars and fixtures
Blocking for future grab bars, handrails, and heavy fixtures must be installed before drywall since retrofitting requires destructive work later.
A quality audit reveals that a subcontractor has been using Type N mortar instead of specified Type S mortar for below-grade masonry. The primary concern is:
Answer: Type N has lower compressive strength and inadequate durability for below-grade use
Type S mortar has higher compressive strength and greater resistance to freeze-thaw and soil sulfate exposure than Type N, making it mandatory for below-grade applications.