EIFS Inspection Procedures & Quality Control 4 — Questions and Answers
Question 1: What inspection technique is used to locate hollow or delaminated areas in an EIFS lamina without removing material?
- Infrared thermography only
- Sounding (tapping) the surface with a hard mallet (Correct answer)
- Ultrasonic pulse velocity testing
- Ground-penetrating radar scanning
Correct answer: Sounding (tapping) the surface with a hard mallet
Sounding or 'tap testing' produces a hollow sound where the lamina has delaminated from the EPS board, identifying problem areas without destructive investigation.
Question 2: According to EIFS industry guidelines, how far above finished grade should the bottom termination of an EIFS system be located?
- At grade level to minimize exposed foundation
- A minimum of 8 inches above finished grade (Correct answer)
- At least 24 inches above grade
- No minimum — determined by designer preference
Correct answer: A minimum of 8 inches above finished grade
EIFS should terminate a minimum of 8 inches above finished grade to prevent wicking, soil contact, and moisture intrusion at the base of the system.
Question 3: During quality control inspection, an inspector finds that a second layer of reinforcing mesh was not installed in the impact zone as specified. What is the consequence?
- No consequence — single-layer mesh meets all requirements
- Reduced impact resistance that could allow penetration of the lamina (Correct answer)
- Only the insulation board strength is reduced
- The finish coat texture will be uneven
Correct answer: Reduced impact resistance that could allow penetration of the lamina
A double-layer mesh in the impact zone (typically the bottom 6–8 feet) is required for enhanced impact resistance; omitting it leaves the system vulnerable to damage.
Question 4: What does an EIFS inspector look for when evaluating expansion joint placement on a large wall?
- Joints located only at inside corners
- Joints aligned with structural building joints and at specified intervals to accommodate movement (Correct answer)
- Joints only at window heads and sills
- Joints placed randomly to break up the wall visually
Correct answer: Joints aligned with structural building joints and at specified intervals to accommodate movement
Expansion joints must align with structural building movement joints and be placed at specified intervals (typically every 70–100 linear feet) to prevent cracking from thermal and structural movement.
Question 5: An inspector reviewing EIFS mock-up test results sees that the water penetration test (ASTM E331) failed at 6.24 psf. What does this mean for the project?
- The system passed — 6.24 psf exceeds the minimum required pressure
- The mock-up assembly allowed water penetration and must be corrected before full installation proceeds (Correct answer)
- Only the window unit failed; the EIFS itself is acceptable
- The test must be repeated three times before a determination is made
Correct answer: The mock-up assembly allowed water penetration and must be corrected before full installation proceeds
A failure at ASTM E331 means water penetrated the assembly at the test pressure, requiring investigation and correction of the assembly before full-scale installation.
Question 6: Which area of an EIFS installation is MOST prone to cracking due to differential movement and should be given extra scrutiny during inspection?
- Center of large uninterrupted wall panels
- Transitions between EIFS and dissimilar cladding materials (Correct answer)
- Areas behind interior partition walls
- Regions above 30 feet elevation
Correct answer: Transitions between EIFS and dissimilar cladding materials
Transitions between EIFS and other cladding materials experience differential movement, thermal expansion differences, and sealant stress, making them high-risk crack zones.
Question 7: When conducting a final EIFS inspection for project closeout, what record is essential to document system warranty eligibility?
- Subcontractor's labor agreement
- Manufacturer's certificate of compliance or registered warranty documentation (Correct answer)
- Building permit fee receipt
- Owner's title insurance policy
Correct answer: Manufacturer's certificate of compliance or registered warranty documentation
Manufacturers require registration of the installed system with approved materials and installer credentials to validate warranties, making this certificate essential for closeout.
EIFS Inspection Procedures & Quality Control 4
What inspection technique is used to locate hollow or delaminated areas in an EIFS lamina without removing material?