TheLEED for Homes Rating System (v4)addresses bathroom ventilation requirements in theIndoor Environmental Quality (EQ) Prerequisite: Ventilation, which referencesASHRAE Standard 62.2-2010 for minimum airflow rates in residential buildings, including multi-family units.
According to theLEED 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.
TheLEED v4.1 Residential BD+Crating 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 is50 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?
Reference: LEED Reference Guide for Homes Design and Construction, v4, EQ Prerequisite: Ventilation, p.
142.
C). 1 cfm per ft² (5.08 lps per m²): Bathroom exhaust is not based on floor area but on a fixed rate (50 cfm for intermittent systems).Reference: LEED Reference Guide for Homes Design and Construction, v4, EQ Prerequisite: Ventilation, p. 142.
D). 2 cfm per ft² (10.16 lps per m²): This is also not based on floor area and is incorrect for bathroom exhaust requirements.Reference: LEED Reference Guide for Homes Design and Construction, v4, EQ Prerequisite:
Ventilation, p. 142.
TheLEED AP Homes Candidate Handbookemphasizes EQ prerequisites, including ventilation requirements, and references theLEED Reference Guide for Homes Design and Constructionas a key resource. The exam is based onLEED 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.

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?
Reference: LEED Reference Guide for Homes Design and Construction, v4, Indoor Environmental Quality Prerequisite: Ventilation, p. 142.
C). SMACNA Publication 69.2: SMACNA standards focus on sheet metal and ductwork installation, not system sizing.Reference: No mention in LEED v4 for Homes; irrelevant to HVAC sizing.
D). DOE 2006 HVAC Sizing Guide: While the DOE provides energy guidelines, LEED specifically requires ACCA Manual J for sizing.Reference: LEED Reference Guide for Homes Design and Construction, v4, EA Prerequisite: Minimum Energy Performance, p. 112.
TheLEED AP Homes Candidate Handbookemphasizes EA prerequisites, including HVAC sizing, and references theLEED Reference Guide for Homes Design and Constructionas a key resource. The exam is based onLEED v4, ensuring the relevance of ACCA Manual J.
References:
LEED Reference Guide for Homes Design and Construction, v4, USGBC, Energy and Atmosphere Prerequisite: Minimum Energy Performance, p. 112.
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 ACCA Manual J requirement.

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.
Reference: LEED Reference Guide for Homes Design and Construction, v4, IN Credit: LEED Accredited Professional, p. 189.
TheLEED AP Homes Candidate Handbookemphasizes IN credits, including the LEED AP role, and references theLEED Reference Guide for Homes Design and Constructionas a key resource. The exam is based onLEED v4, ensuring the relevance of the project team requirement.
References:
LEED Reference Guide for Homes Design and Construction, v4, USGBC, Innovation Credit: LEED Accredited Professional, p. 189.
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 LEED AP requirements.

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.
Reference: LEED Reference Guide for Homes Design and Construction, v4, MR Credit: Environmentally Preferable Products, p. 160-161.
TheLEED AP Homes Candidate Handbookemphasizes MR credits, including fly ash in concrete, and references theLEED Reference Guide for Homes Design and Constructionas a key resource. The exam is based onLEED v4, ensuring the relevance of SCM criteria.
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 fly ash criteria.

TheLEED for Homes Rating System (v4)includes theSustainable Sites (SS) Prerequisite: Site Development - Protect or Restore Habitat, which sets requirements for landscaping to protect local ecosystems. A key aspect is preventing the introduction of invasive plant species that can harm biodiversity.
According to theLEED Reference Guide for Homes Design and Construction (v4):
SS Prerequisite: Site Development - Protect or Restore Habitat
Do not introduce any invasive plant species into the landscape. Invasive species are defined as those that are non-native and whose introduction causes or is likely to cause environmental harm.
Source: LEED Reference Guide for Homes Design and Construction, v4, Sustainable Sites Prerequisite: Site Development - Protect or Restore Habitat, p. 72.
TheLEED v4.1 Residential BD+Crating system confirms:
SS Prerequisite: Site Development - Protect or Restore Habitat
The project must not use invasive plant species in landscaping to protect native ecosystems and prevent ecological disruption.
Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.
The prerequisite requires that projectsintroduce no invasive plant species(Option C) to ensure landscaping supports local biodiversity and ecosystem health.
Why not the other options?
Reference: LEED Reference Guide for Homes Design and Construction, v4, SS Credit: Site Development - Protect or Restore Habitat, p. 74.
B). Use plants native to the region: Native plants are encouraged in credits (e.g., WE Credit: Outdoor Water Use or SS Credit: Site Development), but the prerequisite only mandates avoiding invasive species.Reference:
LEED Reference Guide for Homes Design and Construction, v4, SS Prerequisite: Site Development - Protect or Restore Habitat, p. 72.
D). Select plants qualifying as drought tolerant: Drought-tolerant plants are relevant toWE Credit:
Outdoor Water Use, not the SS prerequisite.Reference: LEED Reference Guide for Homes Design and Construction, v4, WE Credit: Outdoor Water Use, p. 98.
TheLEED AP Homes Candidate Handbookemphasizes SS prerequisites, including landscaping requirements, and references theLEED Reference Guide for Homes Design and Constructionas a key resource. The exam is based onLEED v4, ensuring the relevance of the invasive species requirement.
References:
LEED Reference Guide for Homes Design and Construction, v4, USGBC, Sustainable Sites Prerequisite:
Site Development - Protect or Restore Habitat, p. 72.
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 invasive species prohibition.