LEED-AP-BD+C Exam Dumps - USGBC Leadership in Energy and Environmental Design (LEED) Questions and Answers

The percentage of diverted waste for Materials and Resources Credit, Construction and Demolition Waste Management is calculated by dividing the total weight of diverted materials by the total weight of waste generated 1 .  Diverted materials are those that are reused, recycled, salvaged, or donated 2 . In this case, the total weight of diverted materials is:

8 tons (7.3 tonnes) of recycled demolition steel and concrete

6 tons (5.4 tonnes) of used furniture donated to a non-profit organization

1 ton (0.9 tonnes) of removed carpet and ceiling tiles sent back to the manufacturer

40% of 3 tons (2.7 tonnes) of commingled scrap, which is 1.2 tons (1.1 tonnes)

The sum of these weights is 16.2 tons (14.7 tonnes). The total weight of waste generated is 20 tons (18.1 tonnes). Therefore, the percentage of diverted waste is:

(16.2 / 20) x 100 = 81%

However, the credit allows for a 10% adjustment for vegetative waste, which is not considered a building material 3 . Therefore, the percentage of diverted waste after adjustment is:

(81 - 10) = 71%

The closest answer option to this value is B. 75%.

According to the LEED V5 : Building Design + Construction Guide, the 40/60 rule provides guidance for making a decision when several rating systems appear to be appropriate for a project. To use this rule, first assign a rating system to each square foot or square meter of the building, and then choose the most appropriate rating system based on the resulting percentages. The entire gross floor area of a LEED project must be certified under a single rating system and is subject to all prerequisites and attempted credits in that rating system, regardless of mixed construction or space usage type. If a rating system is appropriate for less than 40% of the gross floor area of a LEED project building or space, then that rating system should not be used. If a rating system is appropriate for more than 60% of the gross floor area of a LEED project building or space, then that rating system should be used. If an appropriate rating system falls between 40% and 60% of the gross floor area, project teams must independently assess their situation and decide which rating system is most applicable 1 . References : LEED V5 : Building Design + Construction Guide, LEED Rating System Selection Guidance 1

According to the LEED V5 Reference Guide for Building Design and Construction, Option 2 of the Sourcing of Raw Materials credit requires using products that meet at least one of the responsible extraction criteria for at least 25%, by cost, of the total value of permanently installed building products in the project 1 . Therefore, for a project with a material cost of $100,000, the minimum material value needed to achieve this option is 25% of $100,000, which is $25,000.

Large commercial buildings are most often dominated by internal loads, which are the heat gains or losses from people, equipment, lighting, and other sources inside the building. Internal loads can affect the heating and cooling loads and the energy consumption of the building. Therefore, reducing internal loads can improve the building’s energy efficiency and performance.  References :

LEED AP BD+C V4 Reference Guide, Chapter 5: Energy and Atmosphere, page 5-5 1

ENERGY STAR Building Upgrade Manual, Chapter 6: Lighting, page 6-2 2

Michaels Energy, Shell vs.  Load Dominated Buildings

This alternative analysis can help the team check the impact of reducing the amount of concrete used in the building, which can affect several impact categories, such as global warming potential (GWP), acidification, and eutrophication1. Concrete is a material with high embodied energy and carbon emissions, and reducing its use can lower the environmental impact of the building2. Optimizing the slab depth can also improve the thermal performance and daylighting of the building, which can reduce the operational energy use and demand3.

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 Integrative Process credit, Integrative Process, requires the project team to conduct a preliminary analysis of the energy and water related systems during the pre-design phase, and use the results to inform the design and construction of the project. The analysis must include at least two potential strategies for each of the following areas: site conditions, massing and orientation, basic envelope attributes, lighting levels, thermal comfort ranges, plug and process load needs, programmatic and operational parameters, outdoor water use, and indoor water use. The project team must also document how the analysis informed the owner’s project requirements, basis of design, and design documents.

Detailed Explanation:

Under the BUG Rating Method, all luminaires must meet acceptable fixture ratings (Backlight, Uplight, and Glare ratings) for the project's Model Lighting Ordinance (MLO) lighting zone. This ensures compliance with LEED's Light Pollution Reduction credit by limiting light trespass, reducing glare, and preserving night sky quality.

This option requires the project team to use the same building operating schedule and occupancy hours for both the baseline building and the proposed building in the whole building simulation model1. This option ensures that the energy savings are calculated based on the same level of building activity and occupancy, which are major factors that affect the energy performance of a building2.