CFC CFC Site Preparation & Layout 1 — Questions and Answers
Question 1: What is the first step a fence contractor should take before digging post holes at any job site?
- Order all fence materials
- Call 811 to have underground utilities located (Correct answer)
- Install corner and gate posts first
- Drive stakes along the fence line
Correct answer: Call 811 to have underground utilities located
Calling 811 before digging is required by law in all 50 states; utility locators will mark underground lines to prevent dangerous and costly strikes.
Question 2: When laying out a straight fence line across a level lot, which tool is most commonly used to establish a true, consistent line?
- A 4-foot level held horizontally
- A mason's string line stretched between stakes (Correct answer)
- A tape measure alone
- A chalk line snapped on the ground
Correct answer: A mason's string line stretched between stakes
A taut mason's string line stretched between corner or end stakes provides a continuous visual reference to keep all line posts in perfect alignment.
Question 3: For accurate fence post spacing, measurements should be taken:
- On-center (center of one post to center of the next) (Correct answer)
- Outside edge to outside edge of posts
- Inside edge to inside edge of posts
- Only by measuring the rail span between posts
Correct answer: On-center (center of one post to center of the next)
On-center measurement ensures consistent panel and rail lengths regardless of post width, which is the standard method used in fence layout.
Question 4: On sloped terrain, which fence installation method allows the fence rails to follow the natural contour of the ground?
- Stepped method
- Raking (parallel/contour) method (Correct answer)
- Plumb-and-level method
- Horizontal brace method
Correct answer: Raking (parallel/contour) method
The raking method angles the rails to run parallel with the slope, allowing the fence to follow the ground contour without gaps beneath the bottom rail.
Question 5: When installing fence posts in expansive clay soils, what precaution helps prevent post heaving?
- Use shorter posts to reduce leverage
- Over-excavate the hole and backfill with gravel or concrete (Correct answer)
- Use only wood posts without concrete
- Set posts with dry-mix concrete only
Correct answer: Over-excavate the hole and backfill with gravel or concrete
Over-excavating and replacing expansive clay with compacted gravel or concrete reduces moisture-driven soil expansion that can push posts upward.
Question 6: The standard minimum post hole depth for a 6-foot privacy fence is generally:
- 12 inches
- 18 inches
- 24–30 inches (approximately one-third of the post length) (Correct answer)
- 48 inches
Correct answer: 24–30 inches (approximately one-third of the post length)
Industry standard requires embedding approximately one-third of the post length below grade, placing a 9-foot post for a 6-foot fence about 2.5–3 feet deep.
CFC CFC Site Preparation & Layout 1
What is the first step a fence contractor should take before digging post holes at any job site?