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

Detailed Explanation:

A public park qualifies as a diverse use under LEED because it is a publicly accessible facility that serves the community. LEED defines diverse uses as those that provide amenities, services, or public resources within walking distance, promoting walkable neighborhoods and reducing reliance on vehicles.

Discussing the project goals to help identify the credits and options that the team should attempt is an example of developing the LEED Scorecard. The LEED Scorecard is a tool that shows the potential points that a project can achieve under each credit category of the LEED rating system1. Developing the LEED Scorecard involves selecting the most appropriate credits and options based on the project’s goals, location, budget, and design2. The scorecard helps the project team track their progress and prioritize their actions throughout the design and construction process1. References:

LEED scorecard | U.S. Green Building Council

LEED v4: Building Design + Construction Guide - U.S. Green Building Council

The correct answer is A. Energy and Atmosphere Prerequisite, Minimum Energy Performance. This is because:

Increasing the window-to-wall ratio (WWR) would reduce the solar heat gain and the cooling load of the building, which are two of the main factors that affect the energy performance of a building12.

The WWR is defined as the ratio of the area of windows to the area of external walls in a building3. The higher the WWR, the more natural light and ventilation can be achieved, which can improve the indoor environmental quality (IEQ) and reduce the need for artificial lighting and mechanical systems4.

The LEED AP BD+C V4 credit for IEQ requires that buildings have a minimum WWR of 15% for south-facing walls and 20% for north-facing walls5. However, this minimum WWR may not be sufficient to achieve optimal IEQ in hot regions, where high solar radiation and humidity levels create high cooling demand6. Therefore, increasing the WWR beyond these minimum values can help achieve better IEQ by reducing both solar heat gain and cooling load.

The other prerequisites are not impacted by increasing the WWR. Building-level energy metering is a prerequisite that requires measuring and reporting energy use at individual building units or zones5. Fundamental refrigerant management is a prerequisite that requires ensuring proper handling, storage, use, recovery, and disposal of refrigerants used in cooling systems5. Fundamental commissioning and verification is a prerequisite that requires ensuring that all commissioning activities are documented and verified according to LEED standards5.

According to the LEED v4: Building Design + Construction Guide, the Energy and Atmosphere Prerequisite, Fundamental Commissioning and Verification, requires the project to hire a Commissioning Authority (CxA) to oversee the commissioning process for the mechanical, electrical, plumbing, and renewable energy systems and assemblies. The CxA must have documented commissioning authority experience in at least two building projects, and must not be an employee of the design or construction firms, although they may be contracted through them. The CxA must report the results, findings, and recommendations directly to the owner1.

One of the required responsibilities for the CxA to achieve the prerequisite is to verify installation and performance of the commissioned systems. This includes conducting site observations and spot-checking of equipment installation, performing functional performance testing of the systems, verifying system performance by reviewing testing and balancing reports, and preparing a summary commissioning report of the activities and results1.

The other choices are not required responsibilities for the CxA to achieve the prerequisite, but they are additional responsibilities for the CxA to achieve the Energy and Atmosphere Credit, Enhanced Commissioning, which goes beyond the prerequisite by including more systems, more verification activities, and more documentation. These additional responsibilities are2:

Verify that training requirements are completed. This includes reviewing training plans, agendas, and materials, and verifying that the training delivery and documentation are completed and consistent with the owner’s project requirements (OPR).

Develop systems manual for the commissioned systems. This includes compiling and reviewing the systems manual that provides the necessary information for operating and maintaining the commissioned systems.

Review contractor submittals for the commissioned systems. This includes reviewing the design intent and basis of design documentation, and providing feedback on the contractor submittals related to the commissioned systems, such as shop drawings, product data, and samples.

The assembly U-value of a building envelope component is the overall rate of heat transfer through that component, taking into account the different materials and layers that make up the component. For example, the assembly U-value of a wall would include the effects of the insulation, framing, sheathing, cladding, air films, etc. The assembly U-value is different from the material U-value, which is the rate of heat transfer through a single material. For example, the material U-value of steel is much higher than the material U-value of glass, but the assembly U-value of a steel-framed window may be lower than the assembly U-value of a glass curtain wall, depending on the other factors involved.

The Solar Reflectance Index (SRI) is a measure of the roof’s ability to reject solar heat, as shown by a small temperature rise. It is defined so that a standard black (reflectance 0.05, emittance 0.90) is 0 and a standard white (reflectance 0.80, emittance 0.90) is 100. SRI is calculated using the roof surface’s Solar Reflectance (SR) and Thermal Emittance (TE). SR is the fraction of solar energy that is reflected by the roof, and TE is the relative ability of the roof surface to radiate heat. Therefore, SRI includes the measure of a material’s ability to reflect solar radiation, but not its ability to absorb or emit thermal radiation.

Materials and Resources Credit, Construction and Demolition Waste Management

Salvaged materials are materials that have been recovered or diverted from the waste stream for reuse. They can contribute to the achievement of the Construction and Demolition Waste Management credit, which aims to reduce the amount of waste generated by construction and demolition activities and divert it from landfills and incinerators. By reusing salvaged materials, projects can reduce the demand for new materials, conserve natural resources, save energy, and lower greenhouse gas emissions. Salvaged materials can be counted as part of the total waste diverted from disposal, as long as they are not counted for the Building Life-Cycle Impact Reduction credit1.

The heat island effect is the phenomenon of urban areas having higher air temperatures than surrounding rural areas due to the absorption and emission of heat by human-made surfaces, such as buildings, roads, and pavements. The heat island effect can have negative impacts on the environment, human health, and energy consumption. One of the strategies to reduce the heat island effect is to use highly reflective paving materials that have a high solar reflectance index (SRI), which measures the ability of a surface to reflect solar radiation and stay cool. However, over time, the paving materials can accumulate dirt and dust, which can lower their reflectance and increase their heat absorption. Therefore, a facility manager cleaning highly reflective paving material is reducing the heat island effect by restoring the reflectance and cooling potential of the surface12.

Peak-hour is a term used to describe the time period when the traffic noise is highest, usually during morning and evening rush hours. Peak-hour noise level is measured by the equivalent continuous sound level (Leq), which is an energy-average of the noise level over a specified sample time. For minimum acoustic performance, LEED requires projects to implement acoustic treatment and other measures to minimize noise intrusion from exterior sources for high-noise sites (peak-hour Leq above 60 dBA during school hours).

A vegetated roof primarily contributes to the Sustainable Sites (SS) Credit: Heat Island Reduction. Green roofs reduce the heat island effect by minimizing roof surface temperatures through vegetation, which absorbs less heat than conventional roofing materials. This helps lower building cooling costs and mitigates urban heat effects. Sensitive Land Protection (B) and Site Assessment (C) are unrelated to roof treatments, while Light Pollution Reduction (D) deals with exterior lighting strategies.