Pass the USGBC Leadership in Energy and Environmental Design (LEED) LEED-AP-BD+C Questions and answers with ExamsMirror

SRI generally decreases with age

The Solar Reflectance Index (SRI) is a measure of the ability of a surface to reflect solar heat, as shown by a small temperature rise. It is calculated using the values of solar reflectance and thermal emittance of the surface. The higher the SRI, the lower the heat island effect. However, SRI generally decreases with age due to factors such as weathering, dirt accumulation, and biological growth. Therefore, the Sustainable Sites Credit, Heat Island Reduction takes into account both new and three-year aged SRI values for roofing material to ensure that the material maintains a high level of reflectance over time.

A reliable water-balance model must begin by identifying every applicable water end use within the project scope. These may include plumbing fixtures, irrigation, cooling towers, process equipment, commercial kitchens, laundry, pools, humidification, and other building-specific demands. The team then establishes baseline and proposed consumption for each end use and determines where alternative water supplies can be applied. Prioritising alternative sources before quantifying demand could result in an incorrectly sized or operationally unsuitable system. Coordinating specifications with contract documents is important for implementation, but it does not establish the water balance itself. A complete inventory prevents major demands from being omitted and allows the team to calculate total consumption, potable-water reductions, reuse opportunities, treatment needs, and storage requirements accurately.

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The Materials and Resources Credit, Building Life-Cycle Impact Reduction, rewards projects that reuse existing building structures and envelopes, or salvage materials from off-site or on-site sources. According to the LEED V5 Reference Guide for Building Design and Construction, the project team must calculate the percentage of building being reused by dividing the area of the existing building structure and envelope that is reused by the total area of the completed building structure and envelope1. However, the project team must exclude from the calculation any hazardous materials that are remediated as a part of the project, such as asbestos, lead, mold, or PCBs1. Therefore, the asbestos containing materials found on the perimeter walls will be excluded from the calculation, regardless of the volume.

For Location and Transportation (LT) Credits: Access to Quality Transit , a local bus stop (C) within 1/2 mile (0.8 km) from a building’s entrance qualifies as walkable transit. LEED defines walkable transit as options within reasonable distance for daily commuting, including bus stops, light rail stations, and streetcars. Taxi stands (A) aren’t considered reliable public transit under LEED, and while streetcars (D) are valid, ferry terminals (B) are only acceptable within a 1-mile range.

According to the LEED Reference Guide for Building Design and Construction 1 , the Location and Transportation Credit, Bicycle Facilities, requires the project to provide short-term and long-term bicycle storage and a functional entry or bicycle storage within 200 yards of a bicycle network. The bicycle network is defined as any one of the following:

Off-street bicycle paths or on-street bicycle lanes that are physically marked and separated from motor traffic

Streets designed for a target speed of 25 mph (40 km/h) or less, with traffic calming features such as curb extensions, speed humps, raised crossings, narrowed traffic lanes, median islands, tight corner radii, roundabouts, or landscaping

Streets with a legal speed limit of 25 mph (40 km/h) or less that connect to a larger bicycle network

Therefore, among the given options, only slow speed roadways can define a bicycle network, as they can provide a safer and more comfortable environment for cyclists. One-way streets, bike share, and traffic lights are not sufficient to define a bicycle network, as they do not necessarily indicate the presence of bicycle paths, lanes, or low-speed streets.

ASHRAE 62.1-2010 is the standard that an engineer should use when establishing minimum ventilation rates for a new mechanically ventilated space to earn Indoor Environmental Quality, Minimum Indoor Air Quality Performance. This is the standard referenced by the LEED V5 BD+C Reference Guide for this prerequisite. Local building code, International Mechanical Code 2012, and the ventilation code requiring the greatest volume of outside air are not acceptable alternatives for this prerequisite.

The surrounding residential density is calculated by dividing the total number of dwelling units by the total residential land area. In this case, it would be 780 dwelling units divided by 60% of 130 acres, which equals approximately 13 dwelling units per acre (or 32 dwelling units per hectare).

The nonresidential density, or Floor Area Ratio (FAR), is calculated by dividing the total nonresidential building floor area by the total nonresidential land area. In this case, it would be 1,600,000 ft² divided by 40% of 130 acres, which equals a FAR of approximately 0.47.

These calculations are used when attempting to achieve the Location and Transportation Credit, Surrounding Density and Diverse Uses, under the LEED AP BD+C V4 rating system.

Detailed Explanation:

Providing shade with structures that incorporate energy generation systems (e.g., photovoltaic panels) not only reduces heat island effects but also supports renewable energy credits. LEED encourages such multi-functional strategies that address multiple sustainability objectives.

Tidal-based electrical production is eligible for the Energy and Atmosphere Credit, Renewable Energy Production. This credit rewards projects that use renewable energy systems to offset building energy cost. According to the LEED V5 BD+C Reference Guide, renewable energy systems are defined as “those that use resources that are naturally replenished within a 100-year or shorter cycle and that are greenhouse gas neutral on an annual basis” 1 . Tidal-based electrical production meets this definition, as it uses the kinetic energy of the tides to generate electricity without emitting greenhouse gases. The other options are not eligible for this credit, as ground-source heat pumps are not considered renewable energy systems, municipal solid waste combustion is not greenhouse gas neutral, and passive solar and daylighting strategies do not offset building energy cost.

For LEED BD+C Location and Transportation (LT) Credit: Surrounding Density and Diverse Uses , Option 1: Surrounding Density , the project team must measure:

Residential density in dwelling units per acre (DU/acre) or dwelling units per hectare (DU/ha).

Non-residential density based on floor area ratio (FAR) .

The density must be measured within a ¼-mile (0.40 km) radius of the project boundary.

This credit promotes high-density development and reduces urban sprawl , thereby improving access to amenities and public transportation.

(Source: Official LEED BD+C Reference Manual)