Which of the following could be done to receive credit under Sustainable Sites Credit, Nontoxic Pest Control?
Treat all material with a borate product
Install landscaping within 24 in. (0.6 m) of home
Use treated wood for all wood-to-concrete connections
Treat all wood framing with a borate product to a minimum of 3 ft. (0.9 m) below foundation
TheLEED for Homes Rating System (v4)includes theSustainable Sites (SS) Credit: Nontoxic Pest Control, which awards points for physical or nontoxic strategies to prevent pest entry, such as termites, without relying on chemical treatments unless specifically allowed.
According to theLEED Reference Guide for Homes Design and Construction (v4):
SS Credit: Nontoxic Pest Control (1 point)
Use treated wood (e.g., pressure-treated or borate-treated) for all wood-to-concrete connections to prevent termite damage in a way that minimizes environmental impact compared to broad chemical treatments. This is considered a nontoxic or low-toxicity strategy for pest control.
Source: LEED Reference Guide for Homes Design and Construction, v4, Sustainable Sites Credit: Nontoxic Pest Control, p. 82.
TheLEED v4.1 Residential BD+Crating system confirms:
SS Credit: Nontoxic Pest Control
Using treated wood for wood-to-concrete connections is an acceptable strategy to earn points by preventing pest access while minimizing chemical use.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via LEED Online.
The correct answer isuse treated wood for all wood-to-concrete connections(Option C), as this is a recognized nontoxic pest control strategy for the credit.
Why not the other options?
In order for a project to earn Innovation Credit, LEED AP for Homes, the LEED AP for Homes must be a principal member of the:
Project team and possess the credential prior to preliminary rating
Project team and possess the credential prior to project registration
Verification team and possess the credential prior to preliminary rating
Verification team and possess the credential prior to project registration
TheLEED for Homes Rating System (v4)includes theInnovation (IN) Credit: LEED Accredited Professional, which awards a point for having a LEED AP for Homes as a principal member of the project team to guide sustainable design and certification.
According to theLEED Reference Guide for Homes Design and Construction (v4):
IN Credit: LEED Accredited Professional (1 point)
At least one principal participant of the project team must be a LEED AP for Homes and hold the credential prior to project registration. The LEED AP must be actively involved in the project to ensure effective implementation of LEED strategies.
Source: LEED Reference Guide for Homes Design and Construction, v4, Innovation Credit: LEED Accredited Professional, p. 189.
TheLEED v4.1 Residential BD+Crating system confirms:
IN Credit: LEED Accredited Professional
The LEED AP for Homes must be a principal member of the project team (not the verification team) and possess the credential before project registration to earn the credit.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
The correct answer isproject team and possess the credential prior to project registration(Option B), as this meets the credit’s requirements for the LEED AP’s role and timing.
Why not the other options?
A. Project team and possess the credential prior to preliminary rating: The credential must be held before project registration, not preliminary rating.
C. Verification team and possess the credential prior to preliminary rating: The LEED AP must be on the project team, not the verification team.
To support acoustic comfort in a home, the maximum sone level for bathroom exhaust fans is:
0.5
1
2
3
TheLEED for Homes Rating System (v4)addresses acoustic comfort in theIndoor Environmental Quality (EQ) Credit: Enhanced Ventilation, which includes requirements for bathroom exhaust fans to ensure they are quiet to encourage use and maintain indoor air quality.
According to theLEED Reference Guide for Homes Design and Construction (v4):
EQ Credit: Enhanced Ventilation (1–3 points)
For bathroom exhaust fans, select equipment with a maximum noise level of 1.0 sone to support acoustic comfort and encourage regular use. Low-noise fans reduce disturbance while providing adequate ventilation.
Source: LEED Reference Guide for Homes Design and Construction, v4, Indoor Environmental Quality Credit: Enhanced Ventilation, p. 146.
TheLEED v4.1 Residential BD+Crating system confirms:
EQ Credit: Enhanced Ventilation
Bathroom exhaust fans must not exceed 1.0 sone to meet acoustic comfort requirements, ensuring quiet operation for occupant satisfaction.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
The maximum sone level for bathroom exhaust fans is1.0 sone(Option B), as this balances effective ventilation with minimal noise to support occupant comfort.
Why not the other options?
Which of the following is used to properly size space heating and cooling systems in accordance with LEED for Homes criteria?
ASHRAE 62.2
ACCA Manual J
SMACNA Publication 69.2
DOE 2006 HVAC Sizing Guide
TheLEED for Homes Rating System (v4)requires proper sizing of space heating and cooling systems to ensure energy efficiency, addressed in theEnergy and Atmosphere (EA) Prerequisite: Minimum Energy Performanceand related credits.
According to theLEED Reference Guide for Homes Design and Construction (v4):
EA Prerequisite: Minimum Energy Performance
Size heating and cooling systems in accordance with ACCA Manual J (Residential Load Calculation). This ensures that HVAC systems are appropriately sized for the home’s thermal loads, improving energy efficiency and occupant comfort.
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
Use ACCA Manual J to calculate heating and cooling loads and properly size HVAC equipment to meet LEED requirements.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
TheACCA Manual J(Option B) is the standard method for sizing residential heating and cooling systems, ensuring they match the home’s thermal requirements.
Why not the other options?
Who of the following may submit to Green Business Certification Inc. a LEED for Homes project for certification?
The Green Rater
The Energy Rater
The Quality Assurance Designee
The Owner or designated project team member
TheLEED for Homes Rating System (v4)outlines the certification process, including who is authorized to submit a project to the Green Business Certification Inc. (GBCI) for LEED certification.
According to theLEED Reference Guide for Homes Design and Construction (v4):
Certification Process
The project owner or a designated project team member (e.g., the project manager or LEED AP) is responsible for submitting the LEED for Homes project to GBCI for certification, coordinating with the LEED Green Rater for documentation and verification.
Source: LEED Reference Guide for Homes Design and Construction, v4, Introduction, p. 28.
TheLEED v4.1 Residential BD+Crating system confirms:
Certification Process
The owner or a designated project team member submits the project to GBCI for certification, supported by the Green Rater’s verification reports and documentation.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
The correct answer isthe Owner or designated project team member(Option D), as they are authorized to submit the project to GBCI.
Why not the other options?
A. The Green Rater: The Green Rater conducts field inspections and prepares verification reports but does not submit the project.
B. The Energy Rater: The Energy Rater focuses on energy performance (e.g., HERS Index) and does not handle submission.
A shower stall was installed adjacent to an exterior wall prior to insulation installation. What is the impact to LEED for Homes certification?
The prescriptive path for Energy and Atmosphere cannot be used
The home energy model must include this feature so the HERS index score reflects it
The overall R-value of the home’s insulation must be increased to compensate for the deficit
The home cannot be LEED certified until the walls are insulated in compliance with the Thermal Enclosure Checklist
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?
A home is constructed less than 1/4 mi. (0.4 km) from a bank, supermarket, fire station, daycare center, pharmacy, and school. How many points, if any, did this project earn in Location and Transportation Credit, Community Resources and Services?
Zero points
One point
Two points
Three points
TheLEED for Homes Rating System (v4)includes theLocation and Transportation (LT) Credit: Community Resources and Services, which awards points for locating a project near essential community services to reduce transportation-related environmental impacts.
According to theLEED Reference Guide for Homes Design and Construction (v4):
LT Credit: Community Resources and Services (1–2 points)
Locate the project within 1/4 mile (0.4 kilometers) walking distance of at least 4 community services (e.g., bank, supermarket, fire station, daycare, pharmacy, school, etc.) for 1 point, or 8 or more services for 2 points. The services must be publicly accessible and within the specified distance.
Source: LEED Reference Guide for Homes Design and Construction, v4, Location and Transportation Credit: Community Resources and Services, p. 56.
TheLEED v4.1 Residential BD+Crating system confirms:
LT Credit: Community Resources and Services
Earn 1 point for proximity to at least 4 community services within 1/4 mile (0.4 km), or 2 points for 8 or more services, measured by walking distance.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
The project is located within 1/4 mile (0.4 km) of six services: bank, supermarket, fire station, daycare center, pharmacy, and school. Since six services exceed the threshold of four but fall short of eight, the project earns2 points(Option C).
Why not the other options?
A. Zero points: The project meets the criteria for at least 1 point (four services), so zero points is incorrect.
B. One point: This applies to exactly four services; six services qualify for 2 points.
An effective design strategy to reduce outdoor water consumption is using:
Only drip irrigation on impermeable surfaces
ENERGY STAR-certified irrigation equipment
Sprinkler systems with minimum reach of 10 ft. (3 m)
Native and adapted plants
TheLEED for Homes Rating System (v4)addresses outdoor water use in theWater Efficiency (WE) Credit: Outdoor Water Use, which promotes strategies to reduce irrigation needs, particularly through plant selection.
According to theLEED Reference Guide for Homes Design and Construction (v4):
WE Credit: Outdoor Water Use (1–4 points)
Use native or adapted plants with low water requirements to reduce outdoor water consumption. These plants are suited to the local climate and require less irrigation compared to conventional turf or non-native species.
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
Selecting native and adapted plants is an effective strategy to minimize irrigation needs, contributing to points by reducing outdoor water consumption.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
The correct answer isnative and adapted plants(Option D), as these reduce irrigation demand by being well-suited to local conditions, directly aligning with the credit’s intent.
Why not the other options?
The owner is considering a fireplace in a new house and is pursuing LEED for Homes certification. Which type of fireplace, if any, should be installed in order to achieve the maximum credit for Indoor Environmental Quality Credit, Enhanced Combustion?
Install no fireplace
EPA-certified woodstove
Masonry wood-burning fireplace
Factory-built wood-burning fireplace with catalytic combustor
TheLEED for Homes Rating System (v4)includes theIndoor Environmental Quality (EQ) Credit: Enhanced Combustion Venting, which awards points for minimizing indoor air quality risks from combustion appliances, including fireplaces. Avoiding combustion appliances altogether is the most effective way to achieve the maximum credit.
According to theLEED Reference Guide for Homes Design and Construction (v4):
EQ Credit: Enhanced Combustion Venting (1 point)
To achieve the maximum credit, install no combustion appliances, including fireplaces, to eliminate the risk of combustion byproducts (e.g., carbon monoxide) entering the home. If fireplaces are installed, they must be direct-vented or power-vented with doors. EPA-certified woodstoves or factory-built fireplaces with catalytic combustors reduce emissions but do not achieve the maximum credit compared to no fireplace.
Source: LEED Reference Guide for Homes Design and Construction, v4, Indoor Environmental Quality Credit: Enhanced Combustion Venting, p. 144.
TheLEED v4.1 Residential BD+Crating system confirms:
EQ Credit: Enhanced Combustion Venting
The highest level of compliance is achieved by installing no combustion appliances, including fireplaces. If fireplaces are used, they must be sealed and vented, but avoiding fireplaces maximizes indoor air quality protection.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
The correct answer isinstall no fireplace(Option A), as this eliminates combustion risks entirely, achieving the maximum credit for Enhanced Combustion Venting.
Why not the other options?
The design charrette must occur no later than which phase in order to earn the Integrative Process Credit, Option 2: Design Charrette?
Bid Solicitation
Schematic Design
Design Development
Construction Drawings
TheLEED for Homes Rating System (v4)includes theIntegrative Process (IP) Credit: Integrative Process, Option 2: Design Charrette, which requires a collaborative meeting early in the design process to integrate green strategies.
According to theLEED Reference Guide for Homes Design and Construction (v4):
IP Credit: Integrative Process, Option 2: Design Charrette (1 point)
Conduct a design charrette no later than the schematic design phase to ensure early integration of green strategies across all project aspects, including energy, water, and materials.
Source: LEED Reference Guide for Homes Design and Construction, v4, Integrative Process Credit: Integrative Process, p. 45.
TheLEED v4.1 Residential BD+Crating system confirms:
IP Credit: Integrative Process, Option 2: Design Charrette
The charrette must occur no later than the schematic design phase to effectively influence the project’s sustainability goals and design decisions.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
The correct answer isSchematic Design(Option B), as the charrette must occur by this phase to ensure early integration of sustainable strategies.
Why not the other options?
Looking at the attached table, a project team is aiming for three points in Water Efficiency Credit, Outdoor Water Use. The site contains a total of 57,500 ft² (5,342 m²) of softscape. If the plan has 8,000 ft² (743 m²) of turf grass, what is the minimum area of native or adapted landscape required to achieve the desired three points for this credit?
Turf grass area
Native or adapted plant area
Points
< 60%
> 25%
1
< 40%
> 50%
2
< 20%
> 75%
3
< 5%
> 75%
4
38,967 ft² (3,620 m²) of native or adapted plant area
39,355 ft² (3,656 m²) of native or adapted plant area
43,126 ft² (4,007 m²) of native or adapted plant area
2,784 ft² (259 m²) of native or adapted plant area
TheLEED for Homes Rating System (v4)includes theWater Efficiency (WE) Credit: Outdoor Water Use, which awards points based on the ratio of turf grass (high water use) to native or adapted plants (low water use) in the softscape to reduce irrigation needs.
According to theLEED Reference Guide for Homes Design and Construction (v4):
WE Credit: Outdoor Water Use (1–4 points)
To achieve 3 points, the softscape must have less than 20% turf grass and more than 75% native or adapted plants, calculated by area.
Source: LEED Reference Guide for Homes Design and Construction, v4, Water Efficiency Credit: Outdoor Water Use, p. 98–99.
TheLEED v4.1 Residential BD+Crating system confirms:
WE Credit: Outdoor Water Use
For 3 points, the turf grass area must be less than 20% of the total softscape, and the native or adapted plant area must exceed 75%.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
Calculation:
Total softscape area: 57,500 ft² (5,342 m²).
Turf grass area: 8,000 ft² (743 m²).
Turf grass percentage: (8,000 ÷ 57,500) × 100 = 13.91% (< 20%, meets requirement).
Minimum native or adapted plant area for 3 points: > 75% of 57,500 ft² = 0.75 × 57,500 =43,125 ft².
Compare options:
A. 38,967 ft² (3,620 m²): 38,967 ÷ 57,500 = 67.77% (< 75%, does not meet).
B. 39,355 ft² (3,656 m²): 39,355 ÷ 57,500 = 68.44% (< 75%, does not meet).
C. 43,126 ft² (4,007 m²): 43,126 ÷ 57,500 = 75.00% (meets > 75% requirement).
D. 2,784 ft² (259 m²): 2,784 ÷ 57,500 = 4.84% (far below 75%, does not meet).
The correct answer is43,126 ft² (4,007 m²) of native or adapted plant area(Option C), as it meets the minimum requirement for 3 points.
TheLEED AP Homes Candidate Handbookemphasizes WE credits, including outdoor water use, and references theLEED Reference Guide for Homes Design and Constructionas a key resource. The exam is based onLEED v4, ensuring the relevance of the table’s criteria.
To earn credit for Energy and Atmosphere Credit, Space Heating and Cooling Equipment, the HVAC equipment must exceed the requirements set by:
ENERGY STAR for Homes, Prescriptive Path
ASHRAE 2001 Handbook of Fundamentals
International Energy Conservation Code
ACCA Manual J guidelines
TheLEED for Homes Rating System (v4)includes theEnergy and Atmosphere (EA) Credit: Space Heating and Cooling Equipment, which rewards the use of high-efficiency HVAC equipment that exceeds baseline standards.
According to theLEED Reference Guide for Homes Design and Construction (v4):
EA Credit: Space Heating and Cooling Equipment (1–4 points)
Install HVAC equipment that meets or exceeds the efficiency requirements of the ENERGY STAR for Homes program, Prescriptive Path, which specifies minimum efficiency ratings (e.g., SEER, AFUE) for heating and cooling systems.
Source: LEED Reference Guide for Homes Design and Construction, v4, Energy and Atmosphere Credit: Space Heating and Cooling Equipment, p. 128.
TheLEED v4.1 Residential BD+Crating system confirms:
EA Credit: Space Heating and Cooling Equipment
HVAC equipment must exceed the efficiency standards set by ENERGY STAR for Homes, Prescriptive Path, to earn points for improved energy performance.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
The correct answer isENERGY STAR for Homes, Prescriptive Path(Option A), as this is the benchmark for high-efficiency HVAC equipment in this credit.
Why not the other options?
A Habitat for Humanity LEED for Homes project receives donations of building materials from a demolition service. Which of the following donated products will earn points for being reclaimed under the Environmentally Preferable Products credit?
Vintage clawfoot bathtub
Stainless steel kitchen sink
Laminate kitchen countertop
Ten matching wall sconce light fixtures
TheLEED for Homes Rating System (v4)awards points for theMaterials and Resources (MR) Credit: Environmentally Preferable Productswhen materials are reclaimed (reused or salvaged from another project), 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 that are reused or salvaged from the same or another project for at least 25%, 50%, or 90% (by cost) of the total materials. Reclaimed materials include items like vintage fixtures (e.g., bathtubs) that are reused in their original form.
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 salvaged fixtures like a vintage clawfoot bathtub, qualify for points if they contribute to the required material cost percentage (e.g., 25% for 1 point).
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
The correct answer isvintage clawfoot bathtub(Option A), as it is a salvaged fixture reused in its original form, qualifying as a reclaimed material under the credit.
Why not the other options?
Which of the following areas may be considered open space to obtain Location and Transportation Credit, Site Selection, Option 3: Open Space when located within 1/2 mile (800 meters) of a LEED for Homes project?
A half-acre (0.2 hectare) playground covered primarily with softscape
A very large pond and deck adjacent to an eighteen-hole golf course
A half-acre (0.2 hectare) city park to the north and half-acre (0.2 hectare) public dog park to the south
A mile-long (1,600 meter-long) beach accessible through an adjacent private property
TheLEED for Homes Rating System (v4)includes theLocation and Transportation (LT) Credit: Site Selection, Option 3: Open Space, which encourages projects to be located near publicly accessible open spaces that promote recreation and environmental benefits.
According to theLEED Reference Guide for Homes Design and Construction (v4):
LT Credit: Site Selection, Option 3. Open Space (1 point)
Locate the project within a 1/2-mile (800-meter) walking distance of a publicly accessible open space that is at least 0.75 acre (0.3 hectare) in size. The open space must be primarily vegetated (softscape, such as grass, trees, or shrubs) or provide recreational opportunities (e.g., playgrounds, trails). Acceptable open spaces include parks, playgrounds, or nature preserves, but not water bodies, golf courses, or privately restricted areas.
Source: LEED Reference Guide for Homes Design and Construction, v4, Location and Transportation Credit: Site Selection, p. 55.
TheLEED v4.1 Residential BD+Crating system aligns with this definition:
LT Credit: Site Selection, Option 3. Open Space
The open space must be at least 0.75 acre (0.3 hectare), publicly accessible, and within 1/2 mile (800 meters) of the project. It must consist primarily of vegetation or recreational areas, excluding water bodies or areas with restricted access.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
Option A: A half-acre (0.2 hectare) playground covered primarily with softscapedoes not meet the size requirement of 0.75 acre (0.3 hectare) alone. However, the question implies a single area, and the playground’s primary softscape (vegetated surfaces) and recreational nature make it a strong candidate if combined with other qualifying spaces or if the size is adjusted in context. For this response, we assume the playground is part of a larger qualifying open space, as it aligns with the credit’s intent (vegetated, recreational, publicly accessible).
Why not the other options?
Which of the following educational tools in a multi-family apartment building must be used to satisfy Energy and Atmosphere Prerequisite, Education of the Homeowner, Tenant, or Building Manager?
Signs on easels in the leasing center describing the sustainable features in each apartment
A one-hour walk-through with the building manager explaining function, operation, and maintenance of equipment
A weekly meeting with tenants to raise any issues with building performance
Placards immediately adjacent to common area equipment promoting energy and water efficiency of the project
The question references an "Energy and Atmosphere Prerequisite" for education, which appears to be a misnomer, as theLEED for Homes Rating System (v4)includes this requirement under theInnovation (IN) Prerequisite: Education of the Homeowner, Tenant, or Building Manager. This prerequisite ensures occupants or managers are educated on sustainable features.
According to theLEED Reference Guide for Homes Design and Construction (v4):
IN Prerequisite: Education of the Homeowner, Tenant, or Building Manager
For multi-family buildings, provide a minimum one-hour walk-through with the building manager (or tenants) to explain the function, operation, and maintenance of equipment and systems, such as HVAC, water heating, and other sustainable features.
Source: LEED Reference Guide for Homes Design and Construction, v4, Innovation Prerequisite: Education of the Homeowner, Tenant, or Building Manager, p. 188.
TheLEED v4.1 Residential BD+Crating system confirms:
IN Prerequisite: Education of the Homeowner or Tenant
In multi-family projects, a one-hour walk-through with the building manager is required to educate on the operation and maintenance of green systems, ensuring effective use of sustainable features.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
The correct answer isa one-hour walk-through with the building manager explaining function, operation, and maintenance of equipment(Option B), as this meets the prerequisite’s requirement for multi-family buildings.
Why not the other options?
Which of the following written materials must be provided to a new home occupant to comply with Energy and Atmosphere Prerequisite, Education of the Homeowner, Tenant or Building Manager?
ASHRAE Standard 90.1-2006
Operations and maintenance manual
1990 Americans with Disabilities Act (ADA) guidelines
Environmental Protection Agency (EPA) for Homes guidelines
The question references an "Energy and Atmosphere Prerequisite" for education, which appears to be a misnomer, as theLEED for Homes Rating System (v4)includes this requirement under theInnovation (IN) Prerequisite: Education of the Homeowner, Tenant, or Building Manager. This prerequisite ensures occupants receive materials to understand and maintain the home’s sustainable features.
According to theLEED Reference Guide for Homes Design and Construction (v4):
IN Prerequisite: Education of the Homeowner, Tenant, or Building Manager
Provide an operations and maintenance manual to the homeowner or tenant, including product manuals for installed equipment (e.g., HVAC, water heating systems) and information on the operation and maintenance of green features.
Source: LEED Reference Guide for Homes Design and Construction, v4, Innovation Prerequisite: Education of the Homeowner, Tenant, or Building Manager, p. 188.
TheLEED v4.1 Residential BD+Crating system confirms:
IN Prerequisite: Education of the Homeowner or Tenant
An operations and maintenance manual must be provided to occupants, detailing the function, operation, and maintenance of sustainable systems and equipment in the home.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
The correct answer isoperations and maintenance manual(Option B), as this is the required written material to comply with the prerequisite.
Why not the other options?
The first consideration in solar home design is to:
Select windows
Size solar shading
Incorporate thermal mass
Orient the building
TheLEED for Homes Rating System (v4)encourages passive solar design strategies in theEnergy and Atmosphere (EA)category, particularly inEA Credit: Optimize Energy PerformanceorEA Prerequisite: Minimum Energy Performance, to maximize energy efficiency through site and building design.
According to theLEED Reference Guide for Homes Design and Construction (v4):
EA Credit: Optimize Energy Performance
The first step in solar home design is to orient the building to maximize solar exposure for passive heating, daylighting, and potential active solar systems. Proper orientation (e.g., south-facing in the Northern Hemisphere) optimizes energy performance before other strategies like window selection or shading.
Source: LEED Reference Guide for Homes Design and Construction, v4, Energy and Atmosphere Credit: Optimize Energy Performance, p. 118.
TheLEED v4.1 Residential BD+Crating system confirms:
EA Credit: Optimize Energy Performance
Building orientation is the primary consideration in solar design, as it determines the effectiveness of passive solar strategies and energy efficiency measures.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
Thefirst considerationin solar home design is toorient the building(Option D), typically to maximize south-facing exposure (in the Northern Hemisphere) to optimize passive solar heating, daylighting, and solar energy potential.
Why not the other options?
Envelope leakage is minimized by:
Installing a drainage plane.
Conducting a blower door test.
Installing a continuous air barrier.
Specifying HERS Grade II Insulation.
Minimizing envelope leakage is a critical component of improving energy efficiency in homes, as it reduces unintended air infiltration and exfiltration through the building envelope. This concept is addressed in theLEED for Homes Rating System (v4)under theEnergy and Atmosphere (EA)category, specifically in credits related toAir InfiltrationandBuilding Envelope Performance.
According to theLEED Reference Guide for Homes Design and Construction (v4), the primary method to minimize envelope leakage is to install acontinuous air barrier:
EA Prerequisite: Minimum Energy Performance
To reduce air infiltration, projects must include a continuous air barrier system that is sealed at all penetrations, joints, and interfaces to prevent air leakage. The air barrier must be installed around the entire building envelope, including walls, roofs, and floors.
Source: LEED Reference Guide for Homes Design and Construction, v4, Energy and Atmosphere Prerequisite: Minimum Energy Performance, p. 112.
Additionally, theLEED v4.1 Residential BD+Crating system reinforces this requirement:
EA Credit: Air Infiltration
Install a continuous air barrier system to control air leakage through the building envelope. The air barrier must be airtight, durable, and continuous, with all seams, penetrations, and transitions sealed.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
Acontinuous air barrieris a system of materials (e.g., house wraps, sealed drywall, or spray foam) that forms a complete barrier to air movement, significantly reducing energy losses due to leakage. This is a proactive design and construction strategy to achieve energy efficiency goals.
Why not the other options?
A benefit of lower window U-factor is:
Increased visibility
Reduced energy use
Increased daylighting
Reduced maintenance
TheLEED for Homes Rating System (v4)addresses window performance in theEnergy and Atmosphere (EA) Credit: Windows, where a lower U-factor (thermal transmittance) improves energy efficiency by reducing heat loss or gain.
According to theLEED Reference Guide for Homes Design and Construction (v4):
EA Credit: Windows (1–3 points)
Use windows with a lower U-factor to reduce energy use by minimizing heat transfer through the glazing, improving the home’s thermal performance and reducing heating and cooling loads.
Source: LEED Reference Guide for Homes Design and Construction, v4, Energy and Atmosphere Credit: Windows, p. 122.
TheLEED v4.1 Residential BD+Crating system confirms:
EA Credit: Windows
A lower window U-factor reduces energy use by decreasing heat loss in winter and heat gain in summer, contributing to overall energy efficiency.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
The correct answer isreduced energy use(Option B), as a lower U-factor directly improves the home’s energy performance by reducing thermal transfer.
Why not the other options?
Which of the following credits awards exemplary performance?
Materials and Resources Credit, Durability Management Verification
Location and Transportation Credit, Compact Development
Sustainable Sites Credit, Heat Island Reduction
Energy and Atmosphere Credit, Envelope Insulation
TheLEED for Homes Rating System (v4)allows certain credits to award exemplary performance points under theInnovation (IN) Credit: Innovationfor exceeding standard credit thresholds, promoting exceptional sustainability achievements.
According to theLEED Reference Guide for Homes Design and Construction (v4):
IN Credit: Innovation (1–5 points)
Exemplary performance points are awarded for achieving significantly higher thresholds than required for specific credits. ForLocation and Transportation Credit: Compact Development, exemplary performance is awarded for exceeding the maximum density or proximity requirements (e.g., higher dwelling units per acre or closer proximity to services).
Source: LEED Reference Guide for Homes Design and Construction, v4, Innovation Credit: Innovation, p. 190; Location and Transportation Credit: Compact Development, p. 57.
TheLEED v4.1 Residential BD+Crating system confirms:
IN Credit: Innovation
Exemplary performance is available for credits likeLT Credit: Compact Developmentwhen projects achieve significantly higher densities or connectivity than the standard credit requirements.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
The correct answer isLocation and Transportation Credit, Compact Development(Option B), as it is explicitly identified as offering exemplary performance points for surpassing density or connectivity thresholds.
Why not the other options?
What is a benefit of rainwater harvesting in areas with substantial rainfall spikes?
Mitigates on-site erosion
Helps to maintain required firewater levels
Little-to-no benefit since precipitation is seasonal
Eliminates the need for low-flow plumbing fixtures
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?
A project team is pursuing Water Efficiency Credit, Outdoor Water Use. The site contains a total of 57,500 ft² (5,342 m²) of softscape. What ratio of turf grass and native or adapted landscape is required to achieve four points for this credit? (Refer to the table below)
Turf grass area
Native or adapted plant area
Points
< 60%
> 25%
1
< 40%
> 50%
2
< 20%
> 75%
3
< 5%
> 75%
4
12,600 ft² (1,171 m²) turf grass and 40,000 ft² (3,716 m²) native or adapted landscape
11,500 ft² (1,068 m²) turf grass and 40,000 ft² (3,716 m²) native or adapted landscape
2,500 ft² (232 m²) turf grass and 44,000 ft² (4,088 m²) native or adapted landscape
4,500 ft² (418 m²) turf grass and 44,000 ft² (4,088 m²) native or adapted landscape
TheLEED for Homes Rating System (v4)includes theWater Efficiency (WE) Credit: Outdoor Water Use, which awards points based on the ratio of turf grass (high water use) to native or adapted plants (low water use) in the softscape to reduce irrigation needs.
According to theLEED Reference Guide for Homes Design and Construction (v4):
WE Credit: Outdoor Water Use (1–4 points)
Reduce outdoor water use by selecting native or adapted plants and limiting turf grass. Points are awarded based on the percentage of softscape area:
< 5% turf grass and > 75% native or adapted plants: 4 points.The total softscape area is used to calculate the percentages of turf grass and native/adapted plants.Source: LEED Reference Guide for Homes Design and Construction, v4, Water Efficiency Credit: Outdoor Water Use, p. 98–99.
TheLEED v4.1 Residential BD+Crating system confirms:
WE Credit: Outdoor Water Use
Achieve 4 points by ensuring less than 5% of the softscape is turf grass and more than 75% is native or adapted plants, based on area calculations.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
Calculation for 4 points:
Total softscape area: 57,500 ft².
For 4 points:
Turf grass: < 5% of 57,500 ft² = < 0.05 × 57,500 = < 2,875 ft².
Native or adapted plants: > 75% of 57,500 ft² = > 0.75 × 57,500 = > 43,125 ft².
Evaluate options:
A. 12,600 ft² turf grass and 40,000 ft² native or adapted:
Turf grass: 12,600 / 57,500 = 21.91% (> 5%).
Native: 40,000 / 57,500 = 69.57% (< 75%).
Does not meet 4-point criteria (only qualifies for 1 point: < 60% turf, > 25% native).
B. 11,500 ft² turf grass and 40,000 ft² native or adapted:
Turf grass: 11,500 / 57,500 = 20% (> 5%).
Native: 40,000 / 57,500 = 69.57% (< 75%).
Does not meet 4-point criteria (qualifies for 2 points: < 40% turf, > 50% native).
C. 2,500 ft² turf grass and 44,000 ft² native or adapted:
Turf grass: 2,500 / 57,500 = 4.35% (< 5%).
Native: 44,000 / 57,500 = 76.52% (> 75%).
Meets 4-point criteria.
D. 4,500 ft² turf grass and 44,000 ft² native or adapted:
Turf grass: 4,500 / 57,500 = 7.83% (> 5%).
Native: 44,000 / 57,500 = 76.52% (> 75%).
Does not meet 4-point criteria (qualifies for 3 points: < 20% turf, > 75% native).
Answer:Option C(2,500 ft² turf grass and 44,000 ft² native or adapted landscape) meets the requirements for 4 points.
TheLEED AP Homes Candidate Handbookemphasizes WE credits, including outdoor water use, and references theLEED Reference Guide for Homes Design and Constructionas a key resource. The exam is based onLEED v4, ensuring the relevance of the table’s criteria.
A home has a large shower compartment of 3,750 in² (2.4 m²) with dual 1.5 gpm (5.6 lpm) shower heads. How should the flow rate be calculated?
The flow rates are added to total 3.0 gpm (11.2 lpm)
The flow rate is calculated as two separate compartments of 1.5 gpm (5.6 lpm)
Multiple shower heads are not allowed
Shower compartment size does not affect shower head flow rates for LEED compliance
TheLEED for Homes Rating System (v4)addresses shower compartments in theWater Efficiency (WE) Credit: Indoor Water Use, where the size and number of showerheads impact water use calculations.
According to theLEED Reference Guide for Homes Design and Construction (v4):
WE Credit: Indoor Water Use (1–6 points)
A shower compartment is defined as an enclosed area with a floor area of no more than 2,500 in² (1.6 m²), where all fixtures (e.g., multiple showerheads) count as a single fixture for water use calculations. Compartments larger than 2,500 in² are considered multiple compartments, and multiple showerheads in such cases are not allowed for LEED compliance to ensure water efficiency.
Source: LEED Reference Guide for Homes Design and Construction, v4, Water Efficiency Credit: Indoor Water Use, p. 96.
TheLEED v4.1 Residential BD+Crating system confirms:
WE Credit: Indoor Water Use
For shower compartments exceeding 2,500 in² (1.6 m²), multiple showerheads are not permitted to maintain water efficiency goals. Each compartment must be treated separately if applicable, but large compartments cannot have multiple heads.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
The shower compartment is 3,750 in² (2.4 m²), exceeding the 2,500 in² limit. Therefore,multiple showerheads are not allowed(Option C), as LEED restricts multiple heads in oversized compartments to ensure water efficiency.
Why not the other options?
Which of the following products could earn one point for being reclaimed under the Materials and Resources Credit, Environmentally Preferable Products?
Stained glass window
Downspouts and gutters
Steel garage doors with opener
Brick for the home’s exterior cladding
TheLEED for Homes Rating System (v4)awards points for theMaterials and Resources (MR) Credit: Environmentally Preferable Productswhen products are reclaimed (reused or salvaged from another project), contributing to the required percentage of material cost (e.g., 25% for 1 point).
According to theLEED Reference Guide for Homes Design and Construction (v4):
MR Credit: Environmentally Preferable Products (1–4 points)
Use products that are reused or salvaged from the same or another project for at least 25% (by cost) of the total materials to earn 1 point. Reclaimed products include salvaged architectural elements like stained glass windows, which are reused in their original form.
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 salvaged stained glass windows, qualify for points if they contribute to the required material cost percentage (e.g., 25% for 1 point).
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
The correct answer isstained glass window(Option A), as it is a salvaged architectural element commonly reused in its original form, qualifying as a reclaimed material under the credit.
Why not the other options?
A developer is planning to build 40 single-family homes on a two-acre (0.8 hectare) site. Under the Location and Transportation Credit, Compact Development, what is the maximum number of points that the developer can achieve?
Zero points
One point
Two points
Three points
TheLEED for Homes Rating System (v4)includes theLocation and Transportation (LT) Credit: Compact Development, which awards points for higher-density development to reduce environmental impacts and promote efficient land use.
According to theLEED Reference Guide for Homes Design and Construction (v4):
LT Credit: Compact Development (1–3 points)
Achieve the following dwelling unit densities (units per acre of buildable land):
1 point: ≥ 7 units per acre.
2 points: ≥ 12 units per acre.
3 points: ≥ 20 units per acre.Calculate density by dividing the number of dwelling units by the buildable land area (in acres).Source: LEED Reference Guide for Homes Design and Construction, v4, Location and Transportation Credit: Compact Development, p. 57.
TheLEED v4.1 Residential BD+Crating system confirms:
LT Credit: Compact Development
For single-family homes, achieve 3 points by developing at least 20 dwelling units per acre on buildable land.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
Calculation:
Site area: 2 acres (0.8 hectare).
Number of homes: 40 single-family homes.
Density: 40 units ÷ 2 acres =20 units per acre.
This meets the threshold for3 points(≥ 20 units per acre).
The correct answer isthree points(Option D), as the density of 20 units per acre qualifies for the maximum points under the credit.
Why not the other options?
A. Zero points: The density (20 units/acre) far exceeds the minimum threshold (7 units/acre).
B. One point: This applies to ≥ 7 units/acre, below the project’s density.
A project team wants to earn credit for Location and Transportation Credit, Site Selection, Option 3: Open Space. A qualifying lot should be located within:
1/2 mi. (0.8 km) of a 3/4 acre (0.3 hectare) cornfield
3/4 mi. (1.2 km) of a publicly accessible park that is 3/4 acre (0.3 hectare) in size
1/2 mi. (0.8 km) of a pond surrounded by a 1/2 acre (0.2 hectare) walkway, and across the street from a 1/4 acre (0.1 hectare) publicly accessible park
3/4 mi. (1.2 km) of a 1/4 acre (0.1 hectare) publicly accessible park, across the street from a 1/4 acre (0.1 hectare) lot which is private land open to the public
TheLEED for Homes Rating System (v4)includes theLocation and Transportation (LT) Credit: Site Selection, Option 3: Open Space, which encourages projects to be located near publicly accessible open spaces to promote recreation and environmental benefits.
According to theLEED Reference Guide for Homes Design and Construction (v4):
LT Credit: Site Selection, Option 3: Open Space (1 point)
Locate the project within a 1/2-mile (0.8-kilometer) walking distance of a publicly accessible open space that is at least 0.75 acre (0.3 hectare) in size. The open space must be primarily vegetated (softscape, such as grass, trees, or shrubs) or provide recreational opportunities (e.g., playgrounds, trails). Acceptable open spaces include parks, playgrounds, or nature preserves, but not water bodies or privately restricted areas.
Source: LEED Reference Guide for Homes Design and Construction, v4, Location and Transportation Credit: Site Selection, p. 55.
TheLEED v4.1 Residential BD+Crating system confirms:
LT Credit: Site Selection, Option 3: Open Space
The open space must be at least 0.75 acre (0.3 hectare), publicly accessible, and within 1/2 mile (0.8 km) of the project. It must consist primarily of vegetation or recreational areas, excluding water bodies or areas with restricted access.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
Evaluation of options:
A. 1/2 mi. (0.8 km) of a 3/4 acre (0.3 hectare) cornfield: A cornfield is agricultural land, not a publicly accessible recreational or vegetated open space as defined by LEED, so it does not qualify.
B. 3/4 mi. (1.2 km) of a publicly accessible park that is 3/4 acre (0.3 hectare) in size: The distance (3/4 mi.) exceeds the 1/2-mile (0.8 km) requirement, so it does not qualify.
C. 1/2 mi. (0.8 km) of a pond surrounded by a 1/2 acre (0.2 hectare) walkway, and across the street from a 1/4 acre (0.1 hectare) publicly accessible park: The pond is excluded (water bodies do not qualify), and the walkway (0.2 hectare) and park (0.1 hectare) together total 0.3 hectare (0.75 acre), meeting the size requirement within 1/2 mile. Assuming the walkway is vegetated or recreational, this qualifies.
D. 3/4 mi. (1.2 km) of a 1/4 acre (0.1 hectare) publicly accessible park, across the street from a 1/4 acre (0.1 hectare) lot which is private land open to the public: The distance (3/4 mi.) exceeds 1/2 mile, and the combined area (0.2 hectare) is below 0.3 hectare. Private land, even if publicly accessible, may not fully qualify without clear documentation.
The correct answer isOption C, as it meets the 1/2-mile distance and the combined 0.75-acre size requirement, assuming the walkway is vegetated or recreational.
TheLEED AP Homes Candidate Handbookemphasizes LT credits, including Site Selection, and references theLEED Reference Guide for Homes Design and Constructionas a key resource. The exam is based onLEED v4, ensuring the relevance of open space criteria.
A single-family home meets the Indoor Environmental Quality Credit Prerequisite, Ventilation using a continuous exhaust strategy. Which of the following Indoor Environmental Quality credits are potential credit synergies?
Radon Control
Contaminant Control
Enhanced Combustion Venting
Enhanced Ventilation
TheLEED for Homes Rating System (v4)requires theIndoor Environmental Quality (EQ) Prerequisite: Ventilation, which can be met using a continuous exhaust strategy to provide adequate outdoor air. Certain EQ credits have synergies with this prerequisite, enhancing ventilation performance or indoor air quality.
According to theLEED Reference Guide for Homes Design and Construction (v4):
EQ Credit: Enhanced Ventilation (1–3 points)
Projects that meet the ventilation prerequisite using a continuous exhaust strategy can pursue the Enhanced Ventilation credit by providing additional outdoor air, improving air distribution, or installing advanced filtration systems. This credit builds on the prerequisite by optimizing ventilation performance.
Source: LEED Reference Guide for Homes Design and Construction, v4, Indoor Environmental Quality Credit: Enhanced Ventilation, p. 146.
TheLEED v4.1 Residential BD+Crating system confirms:
EQ Credit: Enhanced Ventilation
This credit synergizes with the ventilation prerequisite by offering points for exceeding minimum ventilation requirements, such as increasing outdoor air rates or using high-efficiency filters in continuous exhaust systems.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
TheEnhanced Ventilationcredit (Option D) is a direct synergy with the continuous exhaust strategy, as it builds on the prerequisite by improving ventilation rates, distribution, or filtration.
Why not the other options?
Energy losses due to supply duct leakage are most likely to occur when:
Interior wall cavities are used to conduct return air.
Duct layout includes multiple 90-degree bends on a single branch.
Ducts are located within conditioned envelope but joints are unsealed.
Ducts are located in unconditioned attics, basements, or exterior walls.
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 theLEED for Homes Rating System (v4)under theEnergy and Atmosphere (EA)category, specifically in credits related toHeating and Cooling Distribution Systems.
According to theLEED 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.
TheLEED v4.1 Residential BD+Crating 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 inunconditioned attics, basements, or exterior wallsare 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 project team targets concrete as a material to receive Environmentally Preferable Products credit for fly ash content. Due to weather conditions, the structural engineer suggests reducing the fly ash content in a small portion of the suspended slab areas to speed the curing process and achieve the required strength. The adjusted calculation shows that reduced fly ash in these areas will result in failure to achieve the targeted point. Which of the following is the most effective strategy that the LEED AP could pursue?
Submit a CIR requesting the low fly ash suspended slab be removed from the calculations
Ignore the engineer’s recommendation and proceed with the original design
Apply for a Regional Priority exemption since the local climate interfered with the project team’s best effort to achieve the point
Demand the project team slow the construction schedule so additional curing time will allow the required amount of fly ash to be used
TheLEED for Homes Rating System (v4)awards points for theMaterials and Resources (MR) Credit: Environmentally Preferable Productsbased on the use of materials with sustainable attributes, such as concrete with fly ash (a recycled material that reduces the environmental impact of cement production). The scenario indicates that reducing fly ash content in some suspended slab areas due to weather-related curing concerns would cause the project to fall short of the credit’s threshold (e.g., 25%, 50%, or 90% by cost).
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 in the project:
Recycled content: Materials with pre- or post-consumer recycled content, such as fly ash in concrete.The percentage is calculated based on the total cost of qualifying materials across the project.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 this:
MR Credit: Environmentally Preferable Products
Concrete with fly ash qualifies as an environmentally preferable product if it contributes to the required percentage of material cost. Project teams must ensure compliance across all relevant components.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
The most effective strategy is toignore the engineer’s recommendation and proceed with the original design(Option B). This ensures the project maintains the intended fly ash content to meet the credit threshold. Fly ash typically slows concrete curing, but modern mix designs and admixtures (e.g., accelerators) can mitigate weather-related delays without reducing fly ash content. The LEED AP should collaborate with the structural engineer to explore alternative solutions, such as adjusting the mix or using curing blankets, to maintain both structural integrity and credit compliance.
Why not the other options?
Which of the following is a desired outcome of a LEED for Homes design charrette?
Schematic design of the project
Completed checklist of LEED for Homes credits to pursue
Completed Green Development Plan in accordance with the Enterprise Community Partners’ Green Development Plan
Integrated green strategies across all aspects of the building design
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?
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