Hardscape Design and Construction Flashcards

What does ADA compliance require for the cross-slope of an accessible pedestrian path?

Answer: Maximum 2 percent cross slope

ADA guidelines require that accessible paths have a maximum 2 percent cross slope perpendicular to direction of travel to prevent wheelchair drift.

Which material is most appropriate for a permeable driveway to reduce stormwater runoff?

Answer: Permeable interlocking concrete pavers (PICP)

Permeable interlocking concrete pavers allow water to pass through joints into an aggregate base, reducing runoff and recharging groundwater.

What is the primary function of a swale in landscape drainage design?

Answer: Convey surface water in a shallow, vegetated channel

A swale is a shallow, vegetated depression designed to convey stormwater runoff slowly across the landscape while filtering pollutants.

What is frost heave and how does it affect hardscape construction?

Answer: Soil expansion from freezing water that displaces pavement

Frost heave occurs when water in the soil freezes and expands, pushing upward on hardscape surfaces causing cracking, displacement, and uneven surfaces.

Which type of mortar joint is most appropriate for brick paving in a wet climate to prevent water infiltration?

Answer: Tooled concave joint

Tooled concave joints compress and seal the mortar, shedding water effectively and resisting moisture infiltration better than open or raked joints.

What is the standard minimum width for a two-person walkway in residential landscape design?

Answer: 5 feet

A 5-foot-wide walkway allows two adults to walk side-by-side comfortably; 3 feet is the minimum for a single-person path.