Landscape Design Hardscape Design 1 — Questions and Answers
Question 1: What is 'hardscape' in landscape design?
- Plants and trees used in a landscape
- Non-living structural elements such as patios, walkways, walls, and driveways (Correct answer)
- Difficult terrain requiring specialized planting
- Commercial-grade landscaping equipment
Correct answer: Non-living structural elements such as patios, walkways, walls, and driveways
Hardscape refers to the non-living, constructed elements of a landscape including patios, walkways, retaining walls, driveways, and other built structures.
Question 2: What is the minimum recommended slope (cross-slope) for a paved patio surface to ensure proper drainage?
- 0% — patios must be perfectly level
- 0.5–1% slope
- 1–2% slope away from structures (Correct answer)
- 5–8% slope
Correct answer: 1–2% slope away from structures
Paved patios should slope at 1–2% (1/8 to 1/4 inch per foot) away from buildings to direct water runoff and prevent pooling or foundation damage.
Question 3: What type of retaining wall system uses interlocking concrete blocks without mortar?
- Cantilever wall
- Gravity wall
- Segmental retaining wall (Correct answer)
- Sheet pile wall
Correct answer: Segmental retaining wall
Segmental retaining walls use dry-stacked, interlocking concrete blocks that rely on the weight and batter (backward lean) of the system for structural stability.
Question 4: What is 'frost heave' and how does it affect hardscape installations in northern US climates?
- The expansion of pavement due to summer heat
- The upward movement of soil and hardscape caused by freezing water expanding beneath the surface (Correct answer)
- Damage to concrete from road salts in winter
- The settling of retaining walls due to soil erosion
Correct answer: The upward movement of soil and hardscape caused by freezing water expanding beneath the surface
Frost heave occurs when water in the soil freezes and expands, pushing hardscape elements upward, causing cracking, displacement, and uneven surfaces.
Question 5: What is the purpose of a 'compacted gravel base' beneath paver installations?
- To add color contrast beneath the pavers
- To provide a stable, well-drained foundation that prevents settling and frost heave (Correct answer)
- To make pavers easier to remove for replacement
- To reflect heat and keep pavers cooler in summer
Correct answer: To provide a stable, well-drained foundation that prevents settling and frost heave
A compacted gravel base provides a stable, freely draining foundation beneath pavers, reducing settling, frost heave, and surface unevenness over time.
Question 6: Which material is most commonly used for edging to keep mulch beds and paver installations separated?
- PVC pipe
- Steel, aluminum, or plastic landscape edging (Correct answer)
- Pressure-treated lumber
- Concrete pavers set vertically
Correct answer: Steel, aluminum, or plastic landscape edging
Steel, aluminum, or flexible plastic landscape edging is installed at the perimeter of beds and hardscape to create a clean border and prevent mulch or soil migration.
Landscape Design Hardscape Design 1
What is 'hardscape' in landscape design?