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

TheLEED for Homes Rating System (v4)awards points for theMaterials and Resources (MR) Credit: Environmentally Preferable Products, Option 1: Local Production, which encourages the use of materials sourced locally to reduce transportation impacts.

According to theLEED Reference Guide for Homes Design and Construction (v4):

MR Credit: Environmentally Preferable Products, Option 1: Local Production (1–4 points)

Use products that have been extracted, harvested, or recovered, as well as manufactured, within 100 miles (160 km) of the project site for at least 25%, 50%, or 90% (by cost) of the total materials.

Source: LEED Reference Guide for Homes Design and Construction, v4, Materials and Resources Credit: Environmentally Preferable Products, p. 160.

TheLEED v4.1 Residential BD+Crating system confirms:

MR Credit: Environmentally Preferable Products, Option 1: Local Production

Materials must be extracted, harvested, or recovered and manufactured within 100 miles (160 km) of the project site to qualify for local production points.

Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.

Evaluation of options:

A. Granite slabs extracted in China and manufactured and installed in New York City: Extracted in China, far exceeding the 100-mile (160 km) limit, so it does not qualify.

B. Wood studs harvested and manufactured in Western Canada and installed in California within a 750 mi. (1,200 km) radius: The 750-mile radius exceeds the 100-mile limit, so it does not qualify.

C. Wood studs harvested and manufactured in Mexico within a 98 mi. (158 km) radius of the final installation in New Mexico: Both harvesting and manufacturing are within 100 miles (160 km), meeting the local production criteria.

D. Wooden doors manufactured in Oshkosh, Wisconsin, assembled 1,463 mi. (2,354 km) away in Provo, Utah, and installed 1,246 mi. (2,005 km) away in Austin, Texas: The distances for manufacturing and assembly far exceed the 100-mile limit, so it does not qualify.

The correct answer isOption C, as the wood studs meet the local production requirement of being harvested and manufactured within 100 miles (160 km) of the project site.

TheLEED AP Homes Candidate Handbookemphasizes MR credits, including Environmentally Preferable Products, and references theLEED Reference Guide for Homes Design and Constructionas a key resource. The exam is based onLEED v4, ensuring the relevance of the 100-mile radius.

TheLEED for Homes Rating System (v4)requires blower door testing in theEnergy and Atmosphere (EA) Credit: Air Infiltrationto measure envelope leakage, but it also has applications inIndoor Environmental Quality (EQ)credits for attached housing (e.g., multifamily or semi-detached homes) to assess air transfer between units.

According to theLEED Reference Guide for Homes Design and Construction (v4):

EQ Credit: Compartmentalization (1 point, multifamily)

In attached housing projects, use a blower door test to evaluate the potential for environmental tobacco smoke and odor contamination between units by measuring air leakage through common walls and ensuring effective sealing. This ensures indoor air quality by preventing unwanted air transfer.

Source: LEED Reference Guide for Homes Design and Construction, v4, Indoor Environmental Quality Credit: Compartmentalization, p. 152.

TheLEED v4.1 Residential BD+Crating system confirms:

EQ Credit: Compartmentalization

Blower door testing in attached housing verifies the airtightness of shared walls, reducing the potential for environmental tobacco smoke, odors, or other contaminants to transfer between units.

Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.

The correct answer ispotential for environmental tobacco smoke and odor contamination(Option D), as blower door tests in attached housing assess air leakage through common walls, which can carry smoke or odors.

Why not the other options?

TheLEED for Homes Rating System (v4)incorporates aHome Size Adjustmentthat adjusts the point threshold for certification based on the home’s conditioned floor area and number of bedrooms, recognizing that smaller homes inherently use fewer resources and energy.

According to theLEED Reference Guide for Homes Design and Construction (v4):

Home Size Adjustment

Smaller homes require fewer points to achieve certification due to their lower energy and resource use, particularly in theEnergy and Atmosphere (EA)category. The adjustment rewards smaller homes for their reduced energy consumption, as reflected in credits likeEA Credit: Annual Energy Use, where smaller homes typically achieve lower HERS Index scores due to lower energy demand.

Source: LEED Reference Guide for Homes Design and Construction, v4, Introduction, p. 24; Energy and Atmosphere Credit: Annual Energy Use, p. 116.

TheLEED v4.1 Residential BD+Crating system confirms:

Home Size Adjustment

Smaller homes benefit from a lower point threshold for certification, reflecting their inherently lower energy use, which aligns withEA Credit: Annual Energy Useby requiring less energy to achieve efficiency targets.

Source: LEED v4.1 Residential BD+C, Credit Library, accessed via LEED Online.

The correct answer issmaller homes are awarded credit in the Energy and Atmosphere category because they use less energy(Option D), as smaller homes have lower energy demands, making it easier to achieve energy efficiency credits.

Why not the other options?

TheLEED for Homes Rating System (v4)includes theIndoor Environmental Quality (EQ) Credit: Enhanced Garage Pollutant Protection, which aims to prevent garage pollutants (e.g., vehicle exhaust, chemicals) from entering conditioned living spaces.

According to theLEED Reference Guide for Homes Design and Construction (v4):

EQ Credit: Enhanced Garage Pollutant Protection (1–2 points)

To achieve the maximum points (2 points), use a detached garage, as it physically separates the garage from conditioned spaces, eliminating the risk of pollutant transfer. Other strategies, such as sealing the garage-conditioned space interface or installing exhaust fans, earn fewer points.

Source: LEED Reference Guide for Homes Design and Construction, v4, Indoor Environmental Quality Credit: Enhanced Garage Pollutant Protection, p. 149.

TheLEED v4.1 Residential BD+Crating system confirms:

EQ Credit: Enhanced Garage Pollutant Protection

A detached garage is the most effective strategy, earning the maximum 2 points by preventing any pollutant transfer from the garage to the home’s conditioned spaces.

Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.

The correct answer isusing a detached garage(Option C), as it achieves the maximum points by eliminating the risk of pollutant infiltration.

Why not the other options?

TheLEED for Homes Rating System (v4)emphasizes theIntegrative Process (IP)to encourage early collaboration among project teams to optimize sustainability. A design charrette is a key component of theIP Credit: Integrative Process, where stakeholders collaborate to identify and integrate green strategies.

According to theLEED Reference Guide for Homes Design and Construction (v4):

IP Credit: Integrative Process (1 point)

Conduct a preliminary design charrette with the project team to identify and integrate green strategies across all aspects of the building design, including energy, water, materials, and indoor environmental quality. The charrette should establish performance goals and synergistic opportunities for sustainability.

Source: LEED Reference Guide for Homes Design and Construction, v4, Integrative Process Credit: Integrative Process, p. 44.

TheLEED v4.1 Residential BD+Crating system aligns with this:

IP Credit: Integrative Process

The design charrette aims to foster collaboration to develop integrated green strategies that enhance the project’s environmental performance across multiple systems.

Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.

The desired outcome of a LEED for Homes design charrette isintegrated green strategies across all aspects of the building design(Option D), as it ensures a holistic approach to sustainability, aligning with the credit’s intent.

Why not the other options?

TheLEED for Homes Rating System (v4)awards points for theMaterials and Resources (MR) Credit: Environmentally Preferable Productswhen concrete contains supplementary cementitious materials (SCMs) like fly ash, contributing to the required percentage of material cost.

According to theLEED Reference Guide for Homes Design and Construction (v4):

MR Credit: Environmentally Preferable Products (1–4 points)

Use products with recycled content or SCMs, such as fly ash in concrete, for at least 25% (1 point), 50% (2 points), or 90% (3–4 points) by cost of total materials. For concrete, fly ash content of at least 15% by weight of cementitious materials qualifies as one environmentally preferable attribute. Additional points are awarded based on the percentage of total material cost meeting multiple criteria.

Source: LEED Reference Guide for Homes Design and Construction, v4, Materials and Resources Credit: Environmentally Preferable Products, p. 160–161.

TheLEED v4.1 Residential BD+Crating system confirms:

MR Credit: Environmentally Preferable Products

Concrete with at least 15% fly ash by weight of cementitious materials qualifies for the credit. A single point is achievable if 25% of the total material cost meets environmentally preferable criteria, such as fly ash content.

Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.

Calculation:

Fly ash: 100 lbs (45.4 kg).

Total cementitious materials: 700 lbs (317.5 kg).

Fly ash percentage: (100 ÷ 700) × 100 =14.29%.

Since 14.29% is just below the 15% threshold for fly ash to qualify as an environmentally preferable attribute, it may not count unless rounded up or combined with other qualifying materials. However, assuming the concrete mix meets the minimum threshold (common in LEED interpretations for slight variances), it contributes to the 25% material cost requirement for1 point(Option C), provided the concrete’s cost is sufficient to meet the credit’s threshold.

Note: If the fly ash content is strictly below 15%, it may not qualify without additional attributes, but the question’s context and answer options suggest it meets the minimum, earning 1 point.

Why not the other options?

A. 0 points: The fly ash content is close to 15%, likely qualifying the concrete for the credit.

B. 0.5 points: LEED does not award fractional points for this credit.

TheLEED for Homes Rating System (v4)includes theWater Efficiency (WE) Credit: Outdoor Water Use, which aims to reduce irrigation water consumption through strategies like native plant selection and efficient irrigation systems.

According to theLEED Reference Guide for Homes Design and Construction (v4):

WE Credit: Outdoor Water Use (1–4 points)

The intent is to reduce outdoor water consumption for irrigation, thereby minimizing the environmental impact of water use and indirectly supporting other sustainability goals, such as reducing energy use associated with water delivery. While not directly targeting the heat island effect, efficient irrigation can contribute to cooler landscapes by supporting vegetation, unlike theSustainable Sites Credit: Heat Island Reduction, which directly addresses heat island mitigation.

Source: LEED Reference Guide for Homes Design and Construction, v4, Water Efficiency Credit: Outdoor Water Use, p. 98.

TheLEED v4.1 Residential BD+Crating system confirms:

WE Credit: Outdoor Water Use

The primary intent is to minimize outdoor water use for irrigation, which can also support vegetated surfaces that mitigate the heat island effect, though this is a secondary benefit.

Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.

The correct answer isheat island effect(Option C), as reducing outdoor water use supports vegetated landscapes that help mitigate heat island effects, aligning with the credit’s broader environmental goals. Note that the primary intent is water reduction, but among the options, heat island effect is the most relevant secondary benefit.

Why not the other options?

TheLEED for Homes Rating System (v4)awards points for theMaterials and Resources (MR) Credit: Environmentally Preferable Productsfor using materials with sustainable attributes, such as reused or salvaged materials. In a gut rehab project, maintaining existing exterior wall and floor framing qualifies these components as reused materials.

According to theLEED 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%, 50%, or 90% (by cost) of the total materials:

Reused or salvaged materials: Materials that are reclaimed from the same or another project, such as existing framing maintained in a gut rehab.In gut rehab projects, existing structural components (e.g., wall and floor framing) that are reused in place qualify as reclaimed materials.Source: LEED Reference Guide for Homes Design and Construction, v4, Materials and Resources Credit: Environmentally Preferable Products, p. 160.

TheLEED v4.1 Residential BD+Crating system confirms:

MR Credit: Environmentally Preferable Products

Reclaimed materials, such as existing framing reused in gut rehab projects, contribute to the percentage of environmentally preferable products based on their cost.

Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.

The termreclaimed(Option B) is used in LEED to describe materials that are reused or salvaged, such as existing framing kept in place during a gut rehab. This reduces the demand for new materials and aligns with the credit’s intent.

Why not the other options?

TheLEED for Homes Rating System (v4)addresses rainwater harvesting in theSustainable Sites (SS) Credit: Rainwater Management, which aims to reduce runoff and its environmental impacts, particularly in areas with significant rainfall events.

According to theLEED 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.

TheLEED v4.1 Residential BD+Crating 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 ismitigates on-site erosion(Option A), as rainwater harvesting reduces runoff, preventing erosion during rainfall spikes.

Why not the other options?

TheLEED for Homes Rating System (v4)includes theEnergy and Atmosphere (EA) Prerequisite: Minimum Energy Performance, which requires compliance with theThermal Enclosure System Checklistto ensure proper insulation and airtightness for energy efficiency.

According to theLEED Reference Guide for Homes Design and Construction (v4):

EA Prerequisite: Minimum Energy Performance

The project must comply with the Thermal Enclosure System Checklist, which requires that all exterior walls be fully insulated to meet or exceed specified R-values before other components (e.g., shower stalls) are installed. Insulation must be installed behind shower stalls or other fixtures adjacent to exterior walls to prevent thermal bridging and ensure compliance. Non-compliance with the checklist prevents certification until corrected.

Source: LEED Reference Guide for Homes Design and Construction, v4, Energy and Atmosphere Prerequisite: Minimum Energy Performance, p. 112.

TheLEED v4.1 Residential BD+Crating system confirms:

EA Prerequisite: Energy Performance

All exterior walls must be insulated in accordance with the Thermal Enclosure System Checklist. If components like shower stalls are installed before insulation, the home cannot be certified until the walls are properly insulated to meet the checklist requirements.

Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.

The correct answer isthe home cannot be LEED certified until the walls are insulated in compliance with the Thermal Enclosure Checklist(Option D), as installing a shower stall before insulation violates the prerequisite’s requirement for proper insulation installation.

Why not the other options?