CMI CMI Advanced Defect Analysis & Documentation 1 — Questions and Answers
Question 1: A CMI observes diagonal cracks at the corners of window openings. What is the most likely cause?
- Normal thermal expansion
- Differential foundation settlement causing structural movement (Correct answer)
- Poor paint application
- Window frame manufacturing defect
Correct answer: Differential foundation settlement causing structural movement
Diagonal stair-step or diagonal cracks radiating from window corners are classic indicators of differential settlement placing stress on the wall assembly.
Question 2: When documenting a defect in a CMI-level report, which approach provides the strongest actionable guidance?
- List the defect with no further comment
- Describe the defect, its location, likely cause, and recommend a qualified contractor for evaluation or repair (Correct answer)
- Use only photos with no written description
- Note the defect only if it is a safety hazard
Correct answer: Describe the defect, its location, likely cause, and recommend a qualified contractor for evaluation or repair
A complete defect entry includes description, location, probable cause, and a specific referral recommendation, which fully informs the client and limits inspector liability.
Question 3: What does efflorescence on a masonry foundation wall primarily indicate?
- Mold growth within the masonry
- Water has migrated through the masonry, depositing mineral salts on the surface (Correct answer)
- Normal concrete curing residue
- Acid rain erosion of the exterior
Correct answer: Water has migrated through the masonry, depositing mineral salts on the surface
Efflorescence is the white crystalline deposit left when water carrying dissolved salts evaporates from the masonry surface, indicating ongoing or past water intrusion.
Question 4: A CMI finds that floor joists have been notched at mid-span. Why is this a significant structural concern?
- It reduces the visual appeal of the basement
- Mid-span notching cuts through the tension zone of the joist, severely reducing load-bearing capacity (Correct answer)
- It only matters for engineered lumber
- It violates fire codes, not structural codes
Correct answer: Mid-span notching cuts through the tension zone of the joist, severely reducing load-bearing capacity
The bottom of a joist at mid-span is the highest-stress tension zone; notching there can reduce load capacity by 50% or more and is prohibited by most building codes.
Question 5: Which condition in an attic most directly indicates a chronic roof leak rather than a one-time event?
- A single wet spot on the sheathing
- Stained and darkened wood with active microbial growth along a consistent pattern (Correct answer)
- Insulation that appears compressed
- Evidence of an old repair patch on the sheathing
Correct answer: Stained and darkened wood with active microbial growth along a consistent pattern
Chronic leaks leave repeated stain patterns, biological growth from sustained moisture, and often deteriorated wood, distinguishing them from isolated single-event wetting.
Question 6: What is the most accurate way to assess whether a visible crack in a concrete slab is active or dormant?
- Measure the crack width once and assume it is stable
- Apply tell-tale marks or witness points across the crack and re-inspect over time (Correct answer)
- Assume all cracks are dormant unless water is present
- Paint over the crack and check if paint bridges it after 30 days
Correct answer: Apply tell-tale marks or witness points across the crack and re-inspect over time
Witness marks or tell-tales placed across a crack reveal whether movement is ongoing by showing displacement or cracking of the mark, confirming active versus dormant status.
CMI CMI Advanced Defect Analysis & Documentation 1
A CMI observes diagonal cracks at the corners of window openings.
What is the most likely cause?