CBI Structural Inspection & Safety — Questions and Answers
Question 1: What is the purpose of a building foundation inspection?
- To verify that footings are properly sized, reinforced, and placed on suitable bearing soil before concrete is poured (Correct answer)
- To check the building's paint color
- To verify the address numbers are correct
- To inspect the finished flooring
Correct answer: To verify that footings are properly sized, reinforced, and placed on suitable bearing soil before concrete is poured
Foundation inspections verify footing dimensions, reinforcement placement, bearing soil capacity, drainage provisions, and compliance with engineered plans before irreversibly covering the work with concrete.
Question 2: What is a load-bearing wall?
- A structural wall that supports weight from above (roof, upper floors) and transfers it to the foundation (Correct answer)
- Any wall in a building
- A wall made of concrete blocks
- A wall with shelves mounted on it
Correct answer: A structural wall that supports weight from above (roof, upper floors) and transfers it to the foundation
Load-bearing walls are critical structural elements that carry and transfer loads from the roof and upper floors down to the foundation. Removing or modifying them without proper engineering can cause structural failure.
Question 3: What should an inspector look for during a framing inspection?
- Correct lumber sizes, proper spacing, connections, fire blocking, headers over openings, and compliance with engineered plans (Correct answer)
- Only the color of the wood
- Whether the walls are painted
- If the carpet has been installed
Correct answer: Correct lumber sizes, proper spacing, connections, fire blocking, headers over openings, and compliance with engineered plans
Framing inspections verify lumber species/grade, member sizes, stud/joist spacing, proper nailing patterns, metal connectors, fire blocking, header sizes, and bracing for lateral loads against approved structural plans.
Question 4: What is the minimum depth for residential footings in most US jurisdictions?
- Below the frost line depth for the local climate zone (Correct answer)
- 6 inches below grade
- At the ground surface
- At least 10 feet deep in all locations
Correct answer: Below the frost line depth for the local climate zone
Footings must extend below the local frost line to prevent frost heave from displacing the foundation. Frost line depth varies from 0 inches in southern states to 60+ inches in northern climates.
Question 5: What is a structural engineer's role in the building inspection process?
- Designing structural systems and providing sealed plans that inspectors verify during construction (Correct answer)
- Building inspectors and structural engineers are the same profession
- Structural engineers only work on bridges
- They inspect buildings after they are completed
Correct answer: Designing structural systems and providing sealed plans that inspectors verify during construction
Structural engineers design load-bearing systems and produce sealed/stamped plans. Building inspectors verify that construction follows these engineered plans, and may require structural engineer involvement for complex conditions.
Question 6: What is Simpson Strong-Tie hardware and why is it important in construction?
- Engineered metal connectors that strengthen wood-to-wood and wood-to-concrete connections at critical structural points (Correct answer)
- A brand of construction adhesive
- A type of decorative hardware
- Safety harnesses for construction workers
Correct answer: Engineered metal connectors that strengthen wood-to-wood and wood-to-concrete connections at critical structural points
Simpson Strong-Tie manufactures engineered metal connectors (joist hangers, hurricane ties, hold-downs, post bases) that provide code-required connections at critical structural points, resisting gravity, wind, and seismic forces.
CBI Structural Inspection & Safety
What is the purpose of a building foundation inspection?