C27 License - C-27 Landscaping Contractor License Hardscape Installation Questions and Answers

Question 1

When constructing a segmental retaining wall, what is the term for the intentional backward lean or slope of the wall face designed to improve its stability against overturning?

Accepted Answer

Batter

Answer

Cant

Answer

Rake

Answer

Shear

Question 2

A contractor is installing an interlocking paver patio. Which of the following is the PRIMARY purpose of edge restraints?

Accepted Answer

To prevent the bedding sand and pavers from shifting laterally.

Answer

To provide a decorative border for the patio area.

Answer

To ensure the base material is compacted to the correct depth.

Answer

To help level the pavers during the final compaction process.

Question 3

According to the California Building Code, a building permit is generally required for a retaining wall when its height exceeds a certain threshold, measured from the bottom of the footing to the top of the wall. What is this typical height?

Accepted Answer

4 feet

Answer

2 feet

Answer

3 feet

Answer

5 feet

Question 4

When pouring a new concrete patio, a contractor forms or cuts shallow grooves into the slab at regular intervals. What is the main purpose of these grooves, known as control joints?

Accepted Answer

To provide a weakened plane that encourages cracking to occur in a straight line.

Answer

To create a decorative pattern on the concrete surface.

Answer

To improve surface drainage and prevent water from pooling.

Answer

To mark locations for future expansion or addition to the patio.

Question 5

Which material is specified by the Interlocking Concrete Pavement Institute (ICPI) for use as the setting bed, the 1-inch layer directly beneath the pavers?

Accepted Answer

Washed concrete sand (ASTM C33)

Answer

Masonry sand

Answer

Decomposed granite

Answer

Stone dust or screenings

Question 6

For a standard pedestrian paver walkway, what is the generally accepted minimum compacted thickness for the aggregate base layer over well-drained soil?

Accepted Answer

4 inches

Answer

8 inches

Answer

2 inches

Answer

10 inches