CFC Site Preparation & Layout Flashcards

Which soil type generally requires the deepest post embedment due to low bearing capacity?

Answer: Loose sandy or fill soil

Sandy and loose soils provide minimal lateral resistance, requiring greater embedment depth and often concrete backfill to keep posts stable under load.

When installing a fence on a hillside using the stepped method, the individual fence sections must be:

Answer: Level (horizontal) with vertical drops between adjacent sections

In the stepped method, each section is installed level and the height difference between sections creates a stair-step appearance at the posts.

Frost depth is a critical factor when determining post embedment depth because:

Answer: Posts set above the frost line can be pushed upward by freeze-thaw cycles

When soil freezes and expands below a shallow post, frost heave pushes the post upward; embedment below the local frost line prevents this movement.

When planning a fence gate rough opening, the measurement must account for:

Answer: Gate width plus clearance for hinges, latch hardware, and swing arc

The rough opening must accommodate the gate leaf width plus hinge gap, latch-side clearance, and any swing arc obstruction to ensure smooth, unobstructed operation.

After setting all posts, the contractor should verify correct installation by checking:

Answer: Vertical plumb with a level and horizontal alignment with a string line

A plumb bob or level confirms each post is vertical, while a taut string line confirms all posts are in the same plane horizontally before panels are installed.

When excavating post holes with a power auger near a marked utility line, the contractor should:

Answer: Hand-dig a tolerance zone of at least 18–24 inches on each side of the marked utility

Utility markings are approximate; federal guidelines require hand-digging within 18–24 inches on either side of any marked utility to safely expose and protect it.