Home Inspector Test Home Inspector Structural Framing Defects 3 — Questions and Answers
Question 1: During a home inspection, the inspector observes that wood structural members in the crawl space show evidence of wood-boring beetle activity. Which sign BEST distinguishes active infestation from old, inactive damage?
- Fresh, powdery frass and clean exit holes indicate active beetles (Correct answer)
- Any exit holes in lumber indicate an active infestation
- Darkened exit holes always mean the infestation is currently active
- Beetle damage is always active unless chemically treated
Correct answer: Fresh, powdery frass and clean exit holes indicate active beetles
Fresh, fine powdery frass and bright, clean-edged exit holes indicate active wood-boring beetles, while old holes are typically darker and lack fresh frass.
Question 2: A home inspector finds that several floor joists have been bored with large holes near their ends to run HVAC ducts. What structural principle explains why this location is particularly problematic?
- Shear forces are highest near the ends of joists, so holes reduce shear capacity (Correct answer)
- Holes near joist ends cause excessive deflection at mid-span
- End holes violate fire-stop requirements more than mid-span holes
- Holes near ends only matter for cantilever conditions
Correct answer: Shear forces are highest near the ends of joists, so holes reduce shear capacity
Shear stress is greatest near the supports (ends) of a beam, so holes in this zone significantly reduce the joist's ability to resist vertical forces.
Question 3: What is the purpose of a 'let-in brace' in wood-frame wall construction?
- A diagonal board notched into studs to provide lateral (shear) resistance (Correct answer)
- A horizontal board used to space studs at the correct interval
- A metal strap installed at the wall corner for seismic uplift resistance
- A horizontal block between studs at mid-height to prevent buckling
Correct answer: A diagonal board notched into studs to provide lateral (shear) resistance
A let-in brace is a diagonal 1x4 board notched flush into studs to stiffen the wall against racking caused by lateral (wind or seismic) loads.
Question 4: A home inspector finds that a second-floor bedroom was added above a garage, but the garage door header appears to be a single 2x10. What is the likely concern?
- A single 2x10 is typically undersized to carry the additional live and dead loads from the floor above (Correct answer)
- The header material is incorrect; only engineered lumber is allowed over garage openings
- The concern is fire separation between the garage and living space, not structural
- A single 2x10 header is standard and adequate for any garage door opening
Correct answer: A single 2x10 is typically undersized to carry the additional live and dead loads from the floor above
A wide garage opening with an added floor above requires a much larger header or beam to carry the additional loads without excessive deflection.
Question 5: When inspecting an older home, a home inspector observes that the floor joists rest directly on the foundation sill plate but no metal anchor bolts are visible at the sill. What hazard does this present?
- The floor and wall framing can slide or lift off the foundation during high winds or seismic events (Correct answer)
- Lack of anchor bolts causes moisture to wick into the sill plate
- Without anchor bolts, floor joists will sag prematurely due to settlement
- Anchor bolts are only required in seismic zones and are cosmetic elsewhere
Correct answer: The floor and wall framing can slide or lift off the foundation during high winds or seismic events
Anchor bolts connect the sill plate to the foundation, preventing the entire structure from sliding or lifting off during lateral forces such as wind or earthquakes.
Question 6: A home inspector notices that a load-bearing stud wall has been framed with 2x3 studs instead of 2x4 studs at 16 inches on center. What is the PRIMARY structural concern?
- 2x3 studs have significantly less load-carrying capacity and are not typically permitted for load-bearing walls (Correct answer)
- 2x3 studs are only a concern if they are more than 8 feet tall
- The main issue is that 2x3 studs cannot accept standard electrical boxes
- 2x3 studs are acceptable if the wall uses metal hangers at each joist
Correct answer: 2x3 studs have significantly less load-carrying capacity and are not typically permitted for load-bearing walls
2x3 studs have substantially reduced cross-sectional area and column strength, making them inadequate for load-bearing applications under most building codes.
Question 7: A home inspector observes that roof trusses have been field-modified by a homeowner to create attic storage space — specifically, the bottom chord has been cut and a small room framed in. What is the structural implication?
- Cutting truss members destroys the engineered load path and can lead to truss failure (Correct answer)
- Modifying trusses is acceptable as long as the room is less than 100 square feet
- The bottom chord is in compression, so cutting it has minimal structural effect
- Truss modifications only affect the roof's insulation value, not its strength
Correct answer: Cutting truss members destroys the engineered load path and can lead to truss failure
Trusses are engineered systems where every member carries specific tension or compression forces; cutting any member without re-engineering can cause collapse.
Home Inspector Test Home Inspector Structural Framing Defects 3
During a home inspection, the inspector observes that wood structural members in the crawl space show evidence of wood-boring beetle activity.
Which sign BEST distinguishes active infestation from old, inactive damage?