CFP Materials Selection 3 — Questions and Answers
Question 1: Which type of fence fabric coating provides the best combination of corrosion resistance and UV stability for chain-link fencing?
- Bare galvanized
- Vinyl-coated galvanized (Correct answer)
- Powder-coated only
- Black oxide
Correct answer: Vinyl-coated galvanized
Vinyl-coated galvanized chain-link has a zinc layer for corrosion resistance plus a PVC outer layer for UV stability and enhanced appearance.
Question 2: What minimum post embedment depth is the general industry rule for fence posts in normal soil conditions?
- One-quarter of total post length
- One-third of total post length (Correct answer)
- One-half of total post length
- 18 inches regardless of height
Correct answer: One-third of total post length
Standard industry practice calls for embedding fence posts to at least one-third of their total length to provide adequate lateral stability.
Question 3: Welded wire fencing rated at 14.5 gauge is most commonly used for which application?
- High-security prison perimeter
- Garden and light animal containment (Correct answer)
- Highway crash barrier
- Industrial heavy equipment enclosure
Correct answer: Garden and light animal containment
14.5 gauge welded wire is a lighter-duty material commonly used for garden borders, plant protection, and containment of small animals.
Question 4: Which fastener material should be used when installing aluminum fence components to prevent galvanic corrosion?
- Standard zinc-plated steel screws
- Stainless steel or aluminum fasteners (Correct answer)
- Copper bolts
- Galvanized iron nails
Correct answer: Stainless steel or aluminum fasteners
Stainless steel or aluminum fasteners are compatible with aluminum and will not cause galvanic corrosion that occurs when dissimilar metals contact each other in the presence of moisture.
Question 5: A client requires a privacy fence that will be painted to match their home. Which material is the MOST paint-friendly and easily maintained?
- Vinyl PVC
- Cedar wood (Correct answer)
- Aluminum
- Chain-link
Correct answer: Cedar wood
Cedar wood accepts paint and stain extremely well, is dimensionally stable, and is one of the most traditional and easily refinished fence materials.
Question 6: When specifying ornamental steel fence panels, what coating process provides the most durable, chip-resistant finish?
- Brush-applied alkyd paint
- Thermoplastic powder coat (Correct answer)
- Lacquer spray finish
- Oil-based primer only
Correct answer: Thermoplastic powder coat
Thermoplastic powder coating is electrostatically applied and oven-cured, creating a finish that is far more durable and chip-resistant than liquid-applied paints.
Question 7: Which of the following fence materials has the HIGHEST thermal expansion coefficient, requiring the most generous gap allowances during installation?
- Steel
- Aluminum
- Vinyl PVC (Correct answer)
- Cedar wood
Correct answer: Vinyl PVC
Vinyl PVC expands and contracts significantly more than metals or wood with temperature changes, requiring expansion gaps to prevent buckling or panel cracking.
CFP Materials Selection 3
Which type of fence fabric coating provides the best combination of corrosion resistance and UV stability for chain-link fencing?