To meet the Indoor Environmental Quality (IEQ) Prerequisite: Minimum Acoustic Performance for

classrooms, sound pressure level measurements should be taken under conditions that reflect typical

classroom use without occupants, ensuring accuracy in assessing HVAC background noise levels.

Furnished, no occupants, HVAC operating at typical level (C) is the correct testing setup, as it

accounts for sound absorption by furniture but excludes ambient noise from people. This setup

provides a more accurate measure of the background noise levels produced by HVAC systems,

ensuring compliance with acoustic performance requirements for optimal learning environments.

To comply with Indoor Environmental Quality Credit, Interior Lighting, Option 1. Lighting Control,

the tenant of a new office building will require 93 lighting control devices with at least three lighting

levels per floor. This is because the credit requires that at least 90% of individual occupant spaces

have lighting controls that enable occupants to adjust the lighting to suit their individual tasks and

p

1. The credit also requires that all shared multioccupant spaces have lighting controls

that enable adjustments that meet the needs of the group1. According to the LEED BD+C Reference

Guide, an individual occupant space is defined as an enclosed space or an open space that is

occupied by one person and is at least 50 square feet (4.6 square meters) in area1. A shared

multioccupant space is defined as an enclosed or open space that is occupied by more than one

person and is at least 100 square feet (9.3 square meters) in area1.

Based on the given information, each workstation can be considered as an individual occupant space,

and each bathroom facility and conference room can be considered as a shared multioccupant space.

Therefore, the number of lighting control devices per floor can be calculated as follows:

For the 100 workstations, 90% of them need lighting controls, which is 90 workstations. Each

workstation needs one lighting control device, so the total number of lighting control devices for the

workstations is 90.

For the two bathroom facilities, each facility needs one lighting control device, so the total number of

lighting control devices for the bathroom facilities is 2.

For the one conference room, one lighting control device is needed, so the total number of lighting

control devices for the conference room is 1.

The total number of lighting control devices per floor is then 90 + 2 + 1 = 93.

Reference: Interior lighting

For schools intended for grades eight and below (or ages 14 and below), Option 2. Pedestrian Access

requires that at least 50% of the students live no more than a 3/4 mi. (1.20 km) walking distance

from a functional entry of a school building. This option aims to encourage schools to locate in areas

where students can walk or bike to school, reducing vehicle trips and emissions, and promoting

physical activity and health. Option 2 is available only for projects that do not meet the requirements

of Option 1. Transit-Served Location, which requires access to quality transit service within a 1/4 mi.

(400 m) walking distance for at least 50% of the students. Reference:

Access to Quality Transit credit in LEED BD+C: Schools v4 - LEED v41

LEED Certification- Requirements for LT CREDIT: ACCESS TO QUALITY TRANSIT2

Understanding the LEED BD+C: Location and Transport credit3

This option applies to projects that renovate an existing building that meets the definition of

abandoned or blighted, and use new materials for at least 50% of the surface area. The project meets

these criteria, as the warehouse is an existing building that is presumably abandoned or blighted,

and the new construction will use new materials for 40% of the interior and some of the

exterior. Reference: LEED v4: Building Design + Construction Guide, Materials and Resources Credit,

Building Life-Cycle Impact Reduction, Option 4: Renovation of Abandoned or Blighted Building

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. Average number of occupants standing or seated

To identify the regularly occupied spaces on a project, the LEED consultant should consider the

average number of occupants standing or seated in each space, as this is the criterion used by the

LEED Reference Guide for Green Building Design and Construction, 20091. Regularly occupied spaces

are defined as areas where workers are seated or standing as they work (or perform regular tasks)

inside a building2. The typical duration of occupancy in each space per day is not necessarily

relevant, as some spaces may be used intermittently but still qualify as regularly occupied2. The rate

of outdoor air provided per person and the fire ratings of installed wall and ceiling assemblies are not

related to the definition of regularly occupied spaces, but rather to other credits such as Indoor

Environmental Quality or Fire and Life Safety.

The renewable energy option is economically feasible if the present value of the utility cost savings

over the lifetime of the system is greater than or equal to the present value of the higher initial cost

of the system. This means that the system will pay for itself and generate net savings in the long run.

The utility cost savings depend on the amount of energy produced by the solar thermal panel, the

price of natural gas, and the inflation rate. The higher initial cost depends on the size, type, and

installation of the solar thermal panel.

Reference:

Solar Thermal: Complete Guide to the Pros, Cons and Costs

Renewable Energy vs Natural Gas – How The Costs Stack Up

Is Solar Cheaper Than Natural Gas? - PowerSouth Energy Cooperative

LEED Reference Guide for Building Design and Construction v4

. Install an on-site photovoltaic array

Installing an on-site photovoltaic array is a direct method to produce renewable energy on the

project site, which can be used to achieve points under the Energy Atmosphere Credit for Renewable

Energy Production. Additionally, it contributes to optimizing energy performance by generating clean

electricity on-site and reducing the need for energy from non-renewable sources.

Reference: As per the LEED AP Building Design + Construction (LEED AP BD+C) V4 resources, the

installation of on-site renewable energy systems like photovoltaic arrays is encouraged to reduce

environmental impacts and improve a building’s energy performance. This aligns with the goals of

both the Renewable Energy Production and Optimize Energy Performance credits under the LEED

rating system. For more detailed information, you can refer to the web-based reference guide in the

credit library at USGBC’s official website.

Selecting a high-reflectance interior paint that meets the SCAQMD Rule 1113 can help contribute

towards two credits: Indoor Environmental Quality Credit, Low-Emitting Materials and Indoor

Environmental Quality Credit, Interior Lighting. The first credit requires that interior paints and

coatings comply with the VOC content limits specified by the SCAQMD Rule 1113 or equivalent

standards to reduce indoor air contaminants that are odorous, irritating, and/or harmful to the

comfort and well-being of installers and occupants1 The second credit aims to provide high-quality

lighting that supports visual acuity and occupant comfort, and that responds to the needs of the

space and its users. One of the strategies to achieve this credit is to use light-colored finishes with a

minimum reflectance of 0.7 for ceilings, 0.5 for walls, and 0.2 for floors to increase the effectiveness

of daylighting and electric lighting systems2 Reference: 1: LEED v4 Reference Guide for Building

Design and Construction, Indoor Environmental Quality Credit: Low-Emitting Materials, page 692. 2:

LEED v4 Reference Guide for Building Design and Construction, Indoor Environmental Quality Credit:

Interior Lighting, page 715.

According to the LEED v4: Building Design + Construction Guide, the location of CO2 sensors in

naturally ventilated spaces to comply with the Indoor Environmental Quality Prerequisite, Minimum

Indoor Air Quality Performance is between 3 ft. and 6 ft. (1 m and 2 m) above the floor. This is one of

the requirements for Option 2. Naturally Ventilated Spaces, which applies to projects that rely on

natural ventilation for all or part of the occupied spaces. The CO2 sensors must be located in each

zone with natural ventilation openings, and must be capable of generating an alarm when the CO2

concentration exceeds the design value1.

The other choices are not correct, because:

At least 6 ft. (2 m) above the floor is the location of CO2 sensors in mechanically ventilated spaces,

not naturally ventilated spaces1.

At least 3 ft. (1 m) away from windows is a general guideline for locating CO2 sensors, but it does not

specify the height above the floor2.

On the ceiling 3 ft. (1 m) away from adjacent walls is not a recommended location for CO2 sensors, as

it may not reflect the actual CO2 concentration at the breathing zone of the occupants2.

Reference: LEED v4: Building Design + Construction Guide, Indoor Environmental Quality

Prerequisite, Minimum Indoor Air Quality Performance, Option 2. Naturally Ventilated Spaces,

Requirements1; ASHRAE Standard 62.1-2016, User’s Manual, Chapter 6, Section 6.2.72

The most likely group of documents to support both Indoor Environmental Quality Credit, Thermal

Comfort, and Indoor Environmental Quality Credit, Interior Lighting, Option 1. Lighting Control is C,

lighting plans, surveys of occupants, sequence of operations.

Lighting plans show the layout and type of lighting fixtures, as well as the lighting controls, such as

dimmers, timers, occupancy sensors, or daylight sensors. Surveys of occupants provide feedback on

the satisfaction and comfort level of the building users regarding the thermal and lighting conditions.

Sequence of operations describes how the mechanical and lighting systems operate and respond to

different scenarios, such as occupancy, temperature, or daylight levels.

These documents can demonstrate that the project meets the requirements for both credits, which

are:

For Thermal Comfort, the project must design the HVAC systems and the building envelope to meet

the requirements of ASHRAE Standard 55-2010, Thermal Environmental Conditions for Human

Occupancy, or a local equivalent, and provide individual thermal comfort controls for at least 50% of

the individual occupant spaces, and group thermal comfort controls for all shared multi-occupant

spaces1.

For Interior Lighting, Option 1. Lighting Control, the project must provide individual lighting controls

that enable adjustments to suit individual task needs for at least 90% of the individual occupant

spaces, and provide lighting system controls for all shared multi-occupant spaces that allow

occupants to adjust the lighting to meet group needs and p

2.

The other groups of documents are less likely to support both credits, because:

Architectural floor plans, mechanical plans, and lamp specifications do not show the lighting controls

or the occupant feedback.

Photometric plans, mechanical schedules, and lamp specifications do not show the thermal comfort

design or the occupant feedback.

Surveys of occupants, photometric plans, and mechanical schedules do not show the lighting

controls or the thermal comfort design.

Reference: LEED v4: Building Design + Construction Guide, Indoor Environmental Quality Credit,

Thermal Comfort, Requirements1; LEED v4: Building Design + Construction Guide, Indoor

Environmental Quality Credit, Interior Lighting, Option 1. Lighting Control, Requirements2