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50% of a new LEED home exterior is clad with salvaged brick; the remaining 50% is clad with wood. In order to earn a point under Materials and Resources Credit, Environmentally Preferable Products, which of the following must be true?
Answer : C
The LEED for Homes Rating System (v4) awards points for the Materials and Resources (MR) Credit: Environmentally Preferable Products when materials meet sustainable criteria, such as being reclaimed, recycled, or FSC-certified. The scenario specifies that 50% of the exterior is clad with salvaged (reclaimed) brick, and the remaining 50% is wood.
According to the LEED Reference Guide for Homes Design and Construction (v4):
MR Credit: Environmentally Preferable Products (1--4 points)
Use products that meet one or more of the following criteria for at least 25% (1 point), 50% (2 points), or 90% (3--4 points) by cost of the total materials:
Reused or salvaged materials: Materials reclaimed from the same or another project, such as salvaged brick.
FSC-certified wood: Wood products certified by the Forest Stewardship Council.
To earn 1 point, at least 25% of the total material cost must meet one or more criteria, with products like salvaged brick qualifying as reclaimed.
Source: LEED Reference Guide for Homes Design and Construction, v4, Materials and Resources Credit: Environmentally Preferable Products, p. 160--161.
The LEED v4.1 Residential BD+C rating system confirms:
MR Credit: Environmentally Preferable Products
Reclaimed materials, such as salvaged brick, contribute to the percentage of environmentally preferable products based on their cost. A minimum of 25% by cost is required for 1 point.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
In this scenario, 50% of the exterior cladding is salvaged brick, which qualifies as reclaimed material. Since at least half of the siding is reclaimed (Option C), this meets the 25% threshold for 1 point, assuming the material cost proportion aligns. The wood portion does not need to be FSC-certified or reclaimed unless additional points are targeted.
Why not the other options?
A . All of the siding is FSC-certified: Only 50% of the siding is wood, and FSC certification is not required for salvaged brick. The 25% threshold can be met with reclaimed brick alone.
B . Cladding combinations cannot earn points: This is incorrect; combinations of reclaimed, FSC-certified, or other qualifying materials can earn points based on total material cost.
D . At least half of the wood siding is both reclaimed and local: The wood does not need to be reclaimed or local; the salvaged brick (50% of siding) already qualifies for the credit. Local production is a separate option (Option 1).
The LEED AP Homes Candidate Handbook emphasizes MR credits, including Environmentally Preferable Products, and references the LEED Reference Guide for Homes Design and Construction as a key resource. The exam is based on LEED v4, ensuring the relevance of reclaimed materials.
References:
LEED Reference Guide for Homes Design and Construction, v4, USGBC, Materials and Resources Credit: Environmentally Preferable Products, p. 160--161.
LEED v4.1 Residential BD+C, USGBC LEED Credit Library, accessed via LEED Online (https://www.usgbc.org/credits).
LEED AP Homes Candidate Handbook, GBCI, October 2024, p. 12 (references study resources and exam scope based on LEED v4).
USGBC LEED for Homes Rating System (v4), available via USGBC website (https://www.usgbc.org/resources/leed-homes-design-and-construction-v4).
LEED v4.1 for Homes, USGBC, accessed via LEED Online, confirming reclaimed material criteria.
Energy losses due to supply duct leakage are most likely to occur when:
Answer : D
Duct leakage in HVAC systems can significantly increase energy losses, particularly when ducts are poorly sealed or located in areas that exacerbate the impact of leakage. This issue is addressed in the LEED for Homes Rating System (v4) under the Energy and Atmosphere (EA) category, specifically in credits related to Heating and Cooling Distribution Systems.
According to the LEED Reference Guide for Homes Design and Construction (v4), the location of ducts plays a critical role in energy losses due to leakage:
EA Credit: Heating and Cooling Distribution Systems
To minimize energy losses, locate all heating and cooling ducts and air handlers within the conditioned envelope of the building. Ducts located in unconditioned spaces, such as attics, basements, or exterior walls, are more likely to lose energy due to leakage, as air escaping from ducts in these areas is lost to the outside or unconditioned zones, increasing heating and cooling loads.
Source: LEED Reference Guide for Homes Design and Construction, v4, Energy and Atmosphere Credit: Heating and Cooling Distribution Systems, p. 126.
The LEED v4.1 Residential BD+C rating system further clarifies this:
EA Credit: Optimize Energy Performance
Ducts located in unconditioned spaces (e.g., attics, unconditioned basements, or exterior walls) contribute to significant energy losses when leakage occurs, as conditioned air escapes to areas outside the thermal envelope. Sealing ducts and locating them within conditioned spaces are best practices to minimize losses.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
Ducts in unconditioned attics, basements, or exterior walls are particularly problematic because any leakage results in conditioned air being lost to spaces that are not temperature-controlled, requiring the HVAC system to work harder to maintain indoor comfort. This scenario maximizes energy losses compared to ducts within the conditioned envelope.
Why not the other options?
A . Interior wall cavities are used to conduct return air: Using interior wall cavities for return air is not a best practice and may cause pressure imbalances or air quality issues, but it is less likely to cause significant energy losses due to supply duct leakage. Return air systems are typically within conditioned spaces, and the primary concern is airflow efficiency, not energy loss to unconditioned areas.
B . Duct layout includes multiple 90-degree bends on a single branch: Multiple 90-degree bends increase airflow resistance, reducing system efficiency, but they do not directly cause duct leakage. Leakage is related to unsealed joints or poor duct construction, not the geometry of the duct layout.
C . Ducts are located within conditioned envelope but joints are unsealed: While unsealed joints cause leakage, ducts within the conditioned envelope leak into spaces that are already temperature-controlled. This reduces the energy impact compared to leakage in unconditioned spaces, as the conditioned air remains within the thermal envelope.
The LEED AP Homes Candidate Handbook confirms that the exam tests knowledge of EA credits, including duct system design and energy performance, referencing the LEED Reference Guide for Homes Design and Construction as a primary resource. The handbook ensures that the exam is based on LEED v4, aligning with the focus on duct location and sealing.
References:
LEED Reference Guide for Homes Design and Construction, v4, USGBC, Energy and Atmosphere Credit: Heating and Cooling Distribution Systems, p. 126--127.
LEED v4.1 Residential BD+C, USGBC LEED Credit Library, accessed via LEED Online (https://www.usgbc.org/credits).
LEED AP Homes Candidate Handbook, GBCI, October 2024, p. 12 (references study resources and exam scope based on LEED v4).
USGBC LEED for Homes Rating System (v4), available via USGBC website (https://www.usgbc.org/resources/leed-homes-design-and-construction-v4).
LEED v4.1 for Homes, USGBC, accessed via LEED Online, confirming duct location impacts.
What strategy should a team take in order to use tropical wood in their LEED registered project?
Answer : A
The LEED for Homes Rating System (v4) includes the Materials and Resources (MR) Prerequisite: Certified Tropical Wood, which regulates the use of tropical wood to prevent unsustainable harvesting from ecologically sensitive regions.
According to the LEED Reference Guide for Homes Design and Construction (v4):
MR Prerequisite: Certified Tropical Wood
All new wood in the project must be nontropical, reused, reclaimed, or certified by the Forest Stewardship Council (FSC). If tropical wood is used, it must be FSC-certified to ensure it is sourced from sustainably managed forests.
Source: LEED Reference Guide for Homes Design and Construction, v4, Materials and Resources Prerequisite: Certified Tropical Wood, p. 156.
The LEED v4.1 Residential BD+C rating system confirms:
MR Prerequisite: Certified Tropical Wood
Tropical wood, if used, must be FSC-certified to comply with the prerequisite. This ensures responsible forestry practices in tropical regions.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
The most effective strategy is to use tropical wood that is FSC-certified (Option A), as this complies with the prerequisite and allows tropical wood in the project while ensuring sustainable sourcing.
Why not the other options?
B . No strategy can be used because tropical wood cannot be used in a LEED project: This is incorrect, as tropical wood is permitted if FSC-certified.
C . Use any regional tropical wood that is not FSC-certified: Non-FSC-certified tropical wood does not comply with the prerequisite, as it risks unsustainable sourcing.
D . Conduct a life-cycle assessment (LCA) to demonstrate that the materials used in the project comply with the intent of the prerequisite: An LCA is not an acceptable compliance path for this prerequisite, which explicitly requires FSC certification for tropical wood.
The LEED AP Homes Candidate Handbook emphasizes MR prerequisites, including Certified Tropical Wood, and references the LEED Reference Guide for Homes Design and Construction as a key resource. The exam is based on LEED v4, ensuring the relevance of FSC certification.
References:
LEED Reference Guide for Homes Design and Construction, v4, USGBC, Materials and Resources Prerequisite: Certified Tropical Wood, p. 156.
LEED v4.1 Residential BD+C, USGBC LEED Credit Library, accessed via LEED Online (https://www.usgbc.org/credits).
LEED AP Homes Candidate Handbook, GBCI, October 2024, p. 12 (references study resources and exam scope based on LEED v4).
USGBC LEED for Homes Rating System (v4), available via USGBC website (https://www.usgbc.org/resources/leed-homes-design-and-construction-v4).
LEED v4.1 for Homes, USGBC, accessed via LEED Online, confirming FSC certification requirement.
What is a benefit of rainwater harvesting in areas with substantial rainfall spikes?
Answer : A
The LEED for Homes Rating System (v4) addresses rainwater harvesting in the Sustainable Sites (SS) Credit: Rainwater Management, which aims to reduce runoff and its environmental impacts, particularly in areas with significant rainfall events.
According to the LEED Reference Guide for Homes Design and Construction (v4):
SS Credit: Rainwater Management (1--3 points)
Rainwater harvesting systems (e.g., rain barrels, cisterns) capture and store rainwater, reducing runoff volume and mitigating on-site erosion, especially during substantial rainfall spikes, by preventing excessive water flow across the site.
Source: LEED Reference Guide for Homes Design and Construction, v4, Sustainable Sites Credit: Rainwater Management, p. 76.
The LEED v4.1 Residential BD+C rating system confirms:
SS Credit: Rainwater Management
A key benefit of rainwater harvesting is mitigating on-site erosion by capturing runoff, particularly in areas with heavy rainfall, reducing soil displacement and environmental damage.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
The correct answer is mitigates on-site erosion (Option A), as rainwater harvesting reduces runoff, preventing erosion during rainfall spikes.
Why not the other options?
B . Helps to maintain required firewater levels: Rainwater harvesting is typically for non-potable uses like irrigation, not firewater systems.
C . Little-to-no benefit since precipitation is seasonal: Rainwater harvesting is highly beneficial during rainfall spikes, storing water for later use.
D . Eliminates the need for low-flow plumbing fixtures: Rainwater harvesting addresses outdoor water, not indoor plumbing fixtures.
The LEED AP Homes Candidate Handbook emphasizes SS credits, including rainwater management, and references the LEED Reference Guide for Homes Design and Construction as a key resource. The exam is based on LEED v4, ensuring the relevance of erosion mitigation.
References:
LEED Reference Guide for Homes Design and Construction, v4, USGBC, Sustainable Sites Credit: Rainwater Management, p. 76.
LEED v4.1 Residential BD+C, USGBC LEED Credit Library, accessed via LEED Online (https://www.usgbc.org/credits).
LEED AP Homes Candidate Handbook, GBCI, October 2024, p. 12 (references study resources and exam scope based on LEED v4).
USGBC LEED for Homes Rating System (v4), available via USGBC website (https://www.usgbc.org/resources/leed-homes-design-and-construction-v4).
LEED v4.1 for Homes, USGBC, accessed via LEED Online, confirming rainwater harvesting benefits.
For a one-bedroom unit in a multi-family building, the minimum bathroom airflow requirement for intermittent local exhaust is:
Answer : B
The LEED for Homes Rating System (v4) addresses bathroom ventilation requirements in the Indoor Environmental Quality (EQ) Prerequisite: Ventilation, which references ASHRAE Standard 62.2-2010 for minimum airflow rates in residential buildings, including multi-family units.
According to the LEED Reference Guide for Homes Design and Construction (v4):
EQ Prerequisite: Ventilation
For intermittent local exhaust in bathrooms, ASHRAE Standard 62.2-2010 requires a minimum airflow rate of 50 cfm (23 lps) for each bathroom to effectively remove moisture and pollutants. This applies to all dwelling units, including one-bedroom units in multi-family buildings.
Source: LEED Reference Guide for Homes Design and Construction, v4, Indoor Environmental Quality Prerequisite: Ventilation, p. 142.
The LEED v4.1 Residential BD+C rating system confirms:
EQ Prerequisite: Ventilation
Intermittent local exhaust in bathrooms must provide at least 50 cfm (23 lps) per ASHRAE 62.2-2010 to ensure adequate ventilation in multi-family units.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
The correct answer is 50 cfm (23 lps) (Option B), as this is the minimum airflow requirement for intermittent bathroom exhaust in a one-bedroom unit per ASHRAE 62.2-2010.
Why not the other options?
A . 25 cfm (11 lps): This is below the minimum required by ASHRAE 62.2-2010 for intermittent bathroom exhaust.
C . 1 cfm per ft (5.08 lps per m): Bathroom exhaust is not based on floor area but on a fixed rate (50 cfm for intermittent systems).
D . 2 cfm per ft (10.16 lps per m): This is also not based on floor area and is incorrect for bathroom exhaust requirements.
The LEED AP Homes Candidate Handbook emphasizes EQ prerequisites, including ventilation requirements, and references the LEED Reference Guide for Homes Design and Construction as a key resource. The exam is based on LEED v4, ensuring the relevance of ASHRAE 62.2-2010.
References:
LEED Reference Guide for Homes Design and Construction, v4, USGBC, Indoor Environmental Quality Prerequisite: Ventilation, p. 142.
LEED v4.1 Residential BD+C, USGBC LEED Credit Library, accessed via LEED Online (https://www.usgbc.org/credits).
LEED AP Homes Candidate Handbook, GBCI, October 2024, p. 12 (references study resources and exam scope based on LEED v4).
USGBC LEED for Homes Rating System (v4), available via USGBC website (https://www.usgbc.org/resources/leed-homes-design-and-construction-v4).
LEED v4.1 for Homes, USGBC, accessed via LEED Online, confirming bathroom exhaust requirements.
