CPR Structural Damage Assessment & Restoration Techniques 2 — Questions and Answers
Question 1: When assessing a fire-damaged wood-frame structure, which condition indicates that a structural member must be replaced rather than repaired?
- Surface charring limited to 1/8 inch depth
- Char depth exceeding 40% of the member's cross-section (Correct answer)
- Smoke staining on the wood surface
- Minor discoloration without structural compromise
Correct answer: Char depth exceeding 40% of the member's cross-section
When char depth exceeds 40% of a structural member's cross-section, the remaining sound wood is insufficient to carry design loads safely.
Question 2: A restorer identifies differential settlement causing stair-step cracking in brick veneer. What is the MOST appropriate first remediation step?
- Tuck-point the cracks immediately
- Identify and correct the underlying foundation cause before any repairs (Correct answer)
- Apply elastomeric coating over the cracked veneer
- Install steel lintels above the affected area
Correct answer: Identify and correct the underlying foundation cause before any repairs
Repairing cosmetic damage before correcting the root cause of settlement will result in recurring cracks and wasted effort.
Question 3: Which instrument is used to assess moisture content within structural wood framing walls without removing wall coverings?
- Thermo-hygrometer
- Boroscope
- Penetrating pin moisture meter
- Non-invasive radio-frequency (RF) moisture meter (Correct answer)
Correct answer: Non-invasive radio-frequency (RF) moisture meter
Non-invasive RF moisture meters detect moisture within wall cavities and framing without requiring holes or probe penetration.
Question 4: During post-flood structural assessment, a restorer finds that a steel I-beam shows surface rust but no section loss. The BEST course of action is:
- Replace the beam entirely
- Apply rust-inhibiting primer after mechanical cleaning (Correct answer)
- Coat with epoxy paint without surface preparation
- Leave untreated since surface rust is cosmetic only
Correct answer: Apply rust-inhibiting primer after mechanical cleaning
Surface rust without section loss can be treated by mechanically removing loose rust and applying a rust-inhibiting primer to prevent further corrosion.
Question 5: What does the term 'hygroscopic' mean in the context of structural restoration assessments?
- Resistant to moisture absorption
- Capable of absorbing and releasing moisture from the surrounding environment (Correct answer)
- Impermeable to water vapor transmission
- Chemically reactive when exposed to water
Correct answer: Capable of absorbing and releasing moisture from the surrounding environment
Hygroscopic materials, such as wood and gypsum board, readily absorb and release moisture based on ambient humidity conditions.
Question 6: When restoring a floor system with water-damaged OSB subfloor panels, a restorer should check for:
- Color change only
- Delamination, swelling, and loss of fastener holding strength (Correct answer)
- Presence of knots in the wood
- Nail spacing compliance only
Correct answer: Delamination, swelling, and loss of fastener holding strength
Water-damaged OSB commonly exhibits delamination, edge swelling, and degraded fastener holding capacity, all of which compromise the floor system's structural performance.
Question 7: In structural damage assessment, a 'point load' refers to:
- A distributed load spread evenly across a surface
- A concentrated force applied at a single location on a structural member (Correct answer)
- Wind pressure acting on an exterior wall
- The total weight of a roof assembly
Correct answer: A concentrated force applied at a single location on a structural member
A point load is a concentrated force applied at a specific location, such as a column bearing on a beam, which creates localized stress in the structure.
CPR Structural Damage Assessment & Restoration Techniques 2
When assessing a fire-damaged wood-frame structure, which condition indicates that a structural member must be replaced rather than repaired?