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129 Cards in this Set
- Front
- Back
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Adhesive
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Any substance used to bond one surface to another by attachment. Adhesives include adhesive bonding primers, adhesive primers, adhesive primers for plastics and any other primer.
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Albedo
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A measure of the reflectivity of a surface. High-albedo materials are very reflective of solar radiation.
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Attached Single-Family Homes
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Homes that serve one family but share one or more vertical party walls with other homes; Eligible to participate in LEED for Homes; This category includes townhomes and rowhomes but does not include stacked duplexes or triplexes, which are considered multifamily buildings.
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Balancing Damper
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An adjustable plate that regulates airflow within ducts.
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Bedroom
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In LEED for Homes, any room or space that could be used or is intended to be used for sleeping purposes, has a door and legal egress and meets local fire and building code requirements.
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Borate
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A wood preservative that is nontoxic to humans but highly toxic to wood-boring insects, such as termites.
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Buildable Land
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The portion of a site where construction can occur. Buildable land excludes public streets and other public rights-of-way, land occupied by nonresidential structures, public parks and land excluded from residential development by law. Land excluded from residential development by a developer cannot be excluded from buildable land calculations in LEED for Homes.
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Built Environment
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The man-made alterations to a specific area, including its natural resources. On a homesite, this includes everything that has been disturbed during construction.
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Catchment
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The surface area of a roof that captures rainwater for a rainwater harvesting system.
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Central Vacuum System
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A network of tubing with inlets throughout the home designed to remove dust and debris to a remote receptacle. A central vacuum system is more efficient than a traditional vacuum cleaner.
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Chain-of-Custody
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In forest certification, the path taken by raw materials, processed materials and products from the forest to the consumer, including all successive stages of processing, transformation, manufacturing and distribution. A chain-of-custody certificate number on invoices for nonlabeled products indicates that the certifier's guidelines for product accounting have been followed. A chain-of-custody certification is not required by distributors of a product that is individually labeled with the Forest Stewardship Council logo and manufacturer's chain-of-custody number.
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Charrette
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An intensive, collaborative session in which a project team discusses design and construction options related to all aspects of the home.
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Chlorofluorocarbon (CFC)
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A chemical compound, once commonly used in refrigeration, that depletes the stratospheric ozone layer.
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Circulation Loop
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A system that returns cold water to the water heater (instead of down the drain) until hot water reaches the faucet. A circulation loop is one component of a structured plumbing system.
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Climate Zone
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In the U.S., one of eight regions as defined by the International Energy Conservation Code that characterize the temperature of an area of the country. Climate zone 1 is the hottest, and climate zone 8 is the coldest.
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Close Combustion
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A design for furnaces and water heaters in which the supply air is ducted from the outside and exhaust gases are ducted to the outdoors. All elements of the system are sealed to prevent combustion exhaust from leaking into the home.
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Combustion Exhaust Gases
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The most common gases resulting from fossil fuel combustion, including carbon dioxide, carbon monoxide, sulfur dioxide and nitrogen oxides. These gases pose health hazards at high concentrations.
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Compensating Shower Valves
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Designed to keep bathing water temperatures in the shower fairly constant when other appliances, such as a washing machine or toilet, are in use and when the hot or cold water supply pressures change or the bathing water outlet temperature changes. Three types of valves are available: Thermostatic compensating valves are designed to keep bathing water temperatures in the shower fairly constant when other appliances, such as a washing machine or toilet, are in use and when the hot or cold water supply pressures change or the bathing water outlet temperature changes. The response of this type of mechanism differs from that of a pressure balance compensating valve. Pressure balance compensating valves are designed to keep bathing water temperature in the shower fairly constant when other appliances, such as a washing machine or toilet, are in use and when the hot or cold water supply pressures change. Conventional, noncompensating valves are completely dependent on the user to adjust the temperature at all times.
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Composite Wood
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A product consisting of wood or plant particles or fibers bonded together by a synthetic resin or binder. Examples include plywood, particleboard, oriented strand board (OSB), medium-density fiberboard (MDF) and composite door cores.
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Conditioned Space
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Interior area that utilizes any method of air-conditioning or heating to control temperature and/or humidity levels, usually measured in cubic feet.
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Conventional Turf
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Grass, typically a monoculture, that requires considerable watering, mowing and/or fertilizers. What is considered conventional turf may vary by region.
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Credit Interpretation Request (CIR)
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CIRs are questions about whether designs, technologies or practices will meet the "intent" of a given LEED for Homes credit (and thereby be awarded LEED points). USGBC-approved CIRs provide an alternate compliance pathway for a given credit when the builder cannot meet the "requirements" stated in the rating system for that credit.
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Demand-Controlled Circulation
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The automatic circulation of water, triggered by a switch or sensor, through a looped system to ensure that hot water is immediately available while keeping unused cold water in the system, saving both water and energy.
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Density
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The quantity of structures on a site, measured for residential buildings as dwelling units per acre of buildable land available for residential uses, and for nonresidential buildings as floor area ratio per net acre of buildable land available for nonresidential uses.
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Designed Landscape
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The arrangement of features on a site, including softscapes (such as grass and shrubs) and hardscapes (such as patios and fountains) but not areas under the roof. Preserved natural areas are not considered part of the designed landscape.
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Detached Single-Family Homes
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Conventional single-family homes; Can be custom, production or affordable; Eligible to participate in LEED for Homes
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Development
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The homes and building lots that surround the LEED for Homes project that is to be built.
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Distribution Uniformity
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A metric for estimating how uniformly water is applied to an area. Distribution uniformity (DU) ranges between 0 and 1, where 1 indicates that the irrigation system is providing perfectly equal coverage. A higher DU means less likelihood of overwatering or underwatering.
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Disturbed Lot Area
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The part of a site that is directly affected by construction activity, including any activity that would compact the soil or damage vegetation.
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Diverted Waste
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Debris from construction or demolition that is not sent to a landfill or incinerator. Strategies for diverting waste include reclamation, recycling and, for certain materials, mulching.
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Drip Irrigation System
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A network of pipes and valves that rest on the soil or underground and slowly deliver water to the root systems of plants. Drip irrigation saves water by minimizing evapotranspiration and topsoil runoff.
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Drought-tolerant Plants
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Plants that can generally survive using only the water that comes from natural precipitation, although the species that are considered drought-tolerant vary by region.
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Dry Well
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An underground structure that collects runoff and distributes it over a large area, increasing absorption and minimizing erosion.
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Dwelling Unit - IRC (Code) Definition
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Permanent provisions for living, sleeping, eating, cooking and sanitation.
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Dual-flush Toilet
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A toilet with two flush volumes, one for solid waste and a reduced volume for liquid waste.
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Durability
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The ability of a building or any of its components to perform their required function in their service environment over a period of time without unforeseen cost for maintenance or repair.
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Durability Risks
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Site-specific environmental factors that can cause failure to a home components.
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Edge Development
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Generally, a group of homes that extend an existing community beyond its borders but remain connected to it. In LEED for Homes, at least 25% of an edge development's perimeter must border land that has been previously developed.
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Emittance/Emissivity
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A measure of how well a surface emits or releases heat. It is a value between 0 and 1. Highly polished aluminum has an emittance less than 0.1. A black non-metallic surface, on the other hand, has an emittance greater then 0.9.
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ENERGY STAR for Homes National Builder Option Package
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A prescriptive-measures approach to achieving the ENERGY STAR for Homes certification.
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ENERGY STAR Home
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A homes built to a high standard of energy efficiency (at least 15% more efficient than the International Energy Conservation Code).
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ENERGY STAR with Indoor airPLUS (IAP)
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A certification program that recognizes homes with systems that ensure high standards of indoor air quality.
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Erosion
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A process in which materials of the earth's surface are loosened, dissolved or worn away and transported by natural agents, such as water, wind or gravity.
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Exemplary Performance
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The exceeding of the requirements for a credit already awarded in the LEED for Homes Rating System. The requirements for earning exemplary performance credit are listed for each credit in the LEED for Homes Reference Guide. Exemplary-performance credit is not available on each credit but is typically reserved for credits where exceeding the current requirements will yield a substantial environmental or human health benefit.
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Failed Item
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Any credit contained in the LEED Requirements for Sampling that are not met in a Tested Home, including insulation installation, duct leakage, prescriptive air sealing requirements, room-by-room air flows, mechanical system efficiency, irrigation efficiency, lot permeability, etc.
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Fly Ash
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The fine ash residue from coal combustion. Fly ash can be substituted for Portland cement, a bonding material in concrete.
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Forest Stewardship Council (FSC) Certification
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A seal of approval awarded to forest managers who adopt environmentally and socially responsible forest management practices and to companies that manufacture and sell products made from certified wood.
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Formaldehyde
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A naturally occurring volatile organic compound used as a preservative. When present in high concentrations, formaldehyde can cause headaches, dizziness, mental impairment and other symptoms and may be a carcinogen.
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Graywater
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Wastewater that comes from household baths and clothes washers and is neither clean nor heavily soiled. More specifically: (1) "Untreated house-hold wastewater which has not come into contact with toilet waste. Graywater includes used water from bathtubs, showers, bathroom wash basins, and water from clothes-washers and laundry tubs. It shall not include wastewater from kitchen sinks or dishwashers" (Uniform Plumbing Code, Appendix G, "Grey Water Systems for Single-Family Dwellings"). (2) "Wastewater discharged from lavatories, bathtubs, showers, clothes washers, and laundry sinks" (International Plumbing Code, Appendix C, "Grey Water Recycling Systems"). Some states and local authorities allow kitchen sink wastewater to be included in graywater.
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Green Rater
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An individual who performs field inspections and performance testing of LEED for Homes measures for the LEED for Homes Provider. A HERS rater with additional training can become a LEED for Homes Green Rater.
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Gut/Rehabilitation Projects
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Projects that are characterized as "substantial gut/rehab" can participate in LEED for Homes, as long as all of the prerequisites can be met. In order to qualify as a substantial gut/rehab, a project must replace most of its systems and components (for example, HVAC or windows) and must open up the exterior walls to enable the thermal bypass inspection to be completed.
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Hardscape
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Elements added to a natural landscape, such as paving stones, gravel, walkways, irrigation systems, roads, retaining walls, sculpture, street amenities, fountains, and other mechanical features. (American Society of Landscape Architects). Hardscapes are often impermeable, but they are not impermeable by definition.
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High-efficiency Toilet (HET)
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A toilet that uses no more than 1.3 gallons per flush
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Home Energy Rating System (HERS) Index
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A system for evaluating the energy efficiency of a home using an energy simulation model (a prediction). A HERS Index of 100 represents the energy efficiency of a home that meets basic IECC code requirements (a comparison); each additional index point represents a 1% increase in energy use, and lower index numbers indicate the percentage savings in energy use.
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Homeowner Manual
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An operations and maintenance manual or binder that includes all the following items: The completed LEED checklist, accountability forms, durability evaluation form and durability inspection checklist. Product manuals on all installed equipment, fixtures and appliances as well as operations and maintenance guidance for any LEED related equipment. General educational information on green power, efficient use of energy and resources as well as occupant activities and choices (such as cleaning products and lighting selection).
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Hydrochlorofluorocarbon (HCFC)
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A chemical compound used as a refrigerant. HCFCs deplete the stratospheric ozone layer, but to a lesser extent than chlorofluorocarbons (CFCs).
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Hydronic System
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A heating or cooling system that uses circulating water as the heat transfer medium, such as a boiler with hot water circulated through radiators.
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Infill site
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A lot in an existing community. In LEED for Homes, an infill site is defined as having at least 75% of its perimeter bordering land that has been previously developed.
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Infiltration Degree-Days
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The sum of the heating degree-days and the cooling degree-days.
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In-law Flat
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A small, separate unit attached or co-located with single family homes.
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Innovation & Design (ID) Requests
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Questions about whether designs, technologies or practices that are not currently included in the LEED for Homes Rating System can be awarded LEED points and/or whether exceptional performance above the requirements set by the LEED for Homes Rating System can be awarded LEED points. USGBC-approved ID Requests provide a method for a builder to receive credit for including an innovative new measure or exceptional performance that is beyond the scope of the existing rating system. USGBC-approved IDs most likely will become LEED for Homes credits in the next version of the rating system.
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Invasive Species
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An alien species whose introduction does or is likely to cause economic or environmental harm or harm to human health. (Executive Order 13112). Not all nonnative species are considered invasive, and invasive species differ by region. Regional agencies that list invasive species are available at www.invasivespeciesinfo.gov/unitedstates/state.shtml
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Ladder Blocking
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A method of framing in which interior partition walls meet and are reinforced by exterior walls, with minimal framing.
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LEED Requirements for Sampling Sets
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The list of LEED for Homes measures that are incorporated into all of the homes in the Samples Set
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LEED Requirements for Sampling
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The list of LEED for Homes measures that are incorporated into all of the units in the multifamily building. Unlike production homes that can be separated into multiple sample sets, multifamily building units must all meet the same performance tier and include the same measures.
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Light Fixture
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Illumination that is permanently fixed to the home. A fluorescent light fixture has an integrated ballast. A compact fluorescent lamp (CFL) is not a light fixture.
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Local Heat Island Effect
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The incidence of higher air and surface temperatures caused by the absorption of solar energy and its reemission from roads, buildings and other structures.
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Lot
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The individual parcel of land on which a home is to be built.
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Low-Rise Multifamily Buildings
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Low-rise multifamily buildings are one to three stories high and include two or more dwelling units.
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Manufactured and Modular Housing
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Manufactured or modular homes can participate in LEED for Homes, but manufacturing plants cannot be LEED certified; only individual homes can earn certification, and only after the home is constructed on-site. Providers and Green Raters are encouraged to ensure that all of the energy requirements are met, particularly the thermal bypass inspection (see EA Prerequisite 1.1, Performance of ENERGY STAR for Homes). These projects will generally require the involvement of the plant manager or owner, and Providers may need to arrange on-site plant inspections.
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Mid-Rise Multifamily Buildings
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Mid-rise multifamily buildings are defined as buildings with four to six stories and at least two dwelling units. These projects are allowed to participate in the LEED for Homes Mid-rise Program. Mid-rise projects must follow the guidance laid out in the LEED for Homes Mid-rise Program Rating System, which includes special energy modeling and ventilation requirements. In order to participate in the Mid-rise Pilot, each project must have (a) adequate expertise to conduct modeling per ASHRAE Standard 90.1; and (b) adequate expertise on mid-rise components and systems so as to provide useful advice on energy reduction strategies.
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Minimum Efficiency Reporting Valve (MERV)
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The effectiveness of a mechanical air filter based on the number and size of the particles that pass through it under normal conditions. The higher the rating, the more effective the filter.
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Mixed-Use Buildings
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Mixed-use projects may participate if at least 50% of the building's total floor area is residential. In these cases, the project team is expected to prepare "green" tenant fit-out guidelines that address the energy, water, air quality and materials performance of the nonresidential portion of the building. These guidelines can be based on the commercial LEED Rating Systems.
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Mulch
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A covering placed around plants to reduce erosion and water loss and to help regulate soil temperature.
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Native Plant
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A plant that has evolved within the particular habitat in which it is being used. Native plants provide food and shelter to indigenous wildlife and grow in balance with surrounding plant and animal species. The characterization of a plant as "native" may vary regionally and even locally.
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No-disturbance Zone
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An area that is preserved during construction.
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Postconsumer Content
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Material diverted from the waste stream during the manufacturing process. Formerly known as postindustrial content. Examples include planer shavings, ply trim, sawdust, chips, bagasse, culls, trimmed materials and obsolete inventory. Excluded is reutilization of materials such as rework, regrind or scrap generated in a process and capable of being reclaimed within the same process that generated it (source: ISO 14021).
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Postconsumer Recycled Content
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Material used and then recycled by consumers, as distinguished from the recycled byproducts of manufacturing, called preconsumer (postindustrial) recycled content.
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Postconsumer Waste
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Material generated by households or by commercial, industrial and institutional facilities that can no longer be used for its intended purpose. This includes returns of materials from the distribution chain (source- ISO 14021). Examples include construction and demolition debris, materials collected through recycling programs, broken pallets (from a pallet refurbishing company, not a pallet-making company), discarded cabinetry and decking, and home maintenance waste (leaves, grass clippings, tree trimmings).
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Potable
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Suitable for drinking. Potable water is generally supplied by municipal water systems.
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Power-vented Exhaust
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The use of an active fan system to pull combustion gases out of the home. Combustion equipment with power venting can use indoor air as the combustion supply air.
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Previously Developed Land
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Having pre-existing paving, construction or significantly altered landscapes. This does not apply to altered landscapes resulting from current agricultural use, forestry use or use as preserved natural area.
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Previously Developed Site
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In LEED for Homes, a lot consisting of at least 75% previously developed land.
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Prime Farmland
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Land that has the best combination of physical and chemical characteristics for producing food, feed, forage, fiber, and oilseed crops, and is also available for these uses. (U.S. CFR, Title 7, Part 657.5).
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Project
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The design and construction of a LEED-certified home or residential building. As defined by the project team, a project may include multiple homes in a development. As defined by the USGBC, each home or building in the community is a separate project and has to be registered and certified as a separate project.
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Provider
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An organization that recruits, trains and coordinates LEED for Homes Green Raters to serve as third-party verifiers of LEED-certified homes. Providers are the official certifiers of LEED for Homes on behalf of the U.S. Green Building Council.
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Quality Assurance Designee (QAD), Provider QAD
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An individual who works for a LEED for Homes Provider who has the responsibility for ensuring that the LEED for Homes quality assurance program is implemented at the Provider level.
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Radon
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A radioactive gas that naturally vents from the ground. Not all homes have problems with radon. High levels of radon are known to be carcinogenic.
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Rain Garden
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A swale, or low tract of land into which water flows, planted with vegetation that requires or tolerates high moisture levels. A rain garden can be designed to reduce the volume of water entering storm drains and replenish groundwater. Rainwater is generally directed to the rain garden by swales or downspouts.
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Rainwater Capture, Rainwater Harvesting
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Rainwater is captured in a cistern and reused for irrigation or interior water demand. This strategy typically collects rain from the roof, but alternative designs that capture water from patios and other hard surfaces are possible.
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Reclaimed Material
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Building components that have been recovered from a demolition site and are reused in their original state (that is, not recycled). Also known as salvaged or reused material.
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Recycled Content
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The weight of recycled material, including both postconsumer and preconsumer (postindustrial) material, divided by the overall weight of the assembly.
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Recycling
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The collection, reprocessing, marketing and use of materials that were diverted or recovered from the solid waste stream.
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Reflectance
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A measure of the ability of a surface to reflect radiation (i.e. light) to the total amount of radiation incident on the surface.
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Refrigerant
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A fluid that absorbs heat from a reservoir at low temperatures and rejects heat at higher temperatures.
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RESCHECK
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Developed by the U.S. Department of Energy, RESCHECK is an easy-to-use software program that determines whether a home's insulation levels meet the IECC (or appropriate local code) requirements. This free software can be downloaded from www.energycodes.gov/rescheck.
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Reuse
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The return of salvaged materials to use in the same or a related capacity.
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R-value
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A measure of thermal resistance, defined as the number of watts lost per square meter at a given temperature difference. R-value is the inverse of U-value (that is, R =1/U).
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Sample Set
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A specific group of homes from which one or more individual homes are randomly selected for testing and verification. Over the course of time, there may be more than one Sample Set in a given subdivision.
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Sedimentation
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The deposition of soil and other natural solids in water bodies. Sedimentation decreases water quality and accelerates the aging process of lakes, rivers and streams.
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Side by Side Attached Units =
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Single family attached housing; Each a separate project.
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Siltation
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The deposition and accumulation of very fine particles in water bodies. Siltation is often harmful to lake, river and stream ecosystems.
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Site
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The individual building lot where a home is to be built. A site may include all of the lots that a builder is responsible for.
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Softscape
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The natural elements of a landscape, such as plant materials and soil. Softscapes can include hard elements, such as rocks.
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Solar Heat Gain Coefficient (SHGC)
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A measure of how well a window blocks heat from the sun, expressed as a fraction of the heat from the sun that enters the window. A lower SHGC is generally preferable, particularly in hot climates.
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Solar Reflectance Index (SRI)
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A composite index used to estimate how hot a surface will get when exposed to full sun. The temperature of a surface depends on the surface’s reflectance and emittance, as well as solar radiation. The Solar Reflectance Index (SRI) is used to determine the effect of the reflectance and emittance on the surface temperature, and varies from 100 for a standard white surface to zero for a standard black surface. The SRI is calculated using ASTM E1980, “Standard Practice for Calculating Solar Reflectance Index of Horizontal and Low-Sloped Opaque Surfaces.” Materials with the highest SRI are the coolest and the most appropriate choice for mitigating the heat island effect.
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Solar Window Screen
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Mesh used to block light and heat from the sun, as well as insects.
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Stacked Units =
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Multifamily; Each building considered a separate project.
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Story
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In LEED for Homes, any floor with living or commercial space.
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Subdivision
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The homes and building lots that immediately surround the new LEED for Homes project that is to be built. A subdivision may be new or preexisting, and belongs to a larger development.
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Substantial Gut Rehabilitation Project, Gut Rehab
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A project replacing most systems and components (HVAC and windows) and must be able to open exterior walls to enable the thermal bypass inspections to be completed.
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Sustainable Forestry
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The practice of managing forest resources to meet the long-term forest product needs of humans while maintaining the integrity of forested landscapes and sustaining a full range of forest values-economic, social and ecological.
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Technical Advisory Sub-Committee
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In LEED for Homes, a group of specialists who rule on Credit Interpretation Requests and Innovation and Design Process Requests.
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Termite
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A wood-eating social insect (order Isoptera) that can cause serious structural damage to buildings in many regions of the United States. Also known as white ant.
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Tested Homes
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Homes in a Sample Set or units in a multifamily building that are selected for testing and verification.
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Thermal Bridge
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A part of a building envelope that has high heat conductance, lowering the average R-value.
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Thermal Envelope, Building Envelope or Envelope
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The thermal enclosure created by the building exterior and insulation.
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Third-party
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An individual or organization that is not involved with the design, construction or installation of the measures or strategies being verified.
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Topsoil
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The uppermost layer of soil, containing high levels of nutrients and organic matter. Healthy topsoil is essential for the survival of trees and plants.
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Tree/Plant Preservation Plan
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A formal assessment of the lot and a development of a landscaping plan that seeks to preserve the most trees and native plants. This is important to do as one of the first steps in the design process to ensure that the developed area takes into account the preservation plan.
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Ureaformaldehyde
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A combination of urea and formaldehyde used in some glues and adhesives, particularly in composite wood products. At room temperature, ureaformaldehyde emits formaldehyde, a toxic and possibly carcinogenic gas.
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U-value
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A measure of thermal conductivity (often used for windows) that is the inverse of R-value. A lower U-value means a more energy-efficient window. Also known as U-factor.
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Vegetated Roof
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A roof partially or fully covered by vegetation, used to manage water runoff and provide additional insulation in winter and cooling in summer.
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Vegetated Swale
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Broad, shallow channels consisting of dense vegetation. Runoff is directed towards swales, which absorb much of the water, reduce or remove particulate pollutants and slows the velocity of rainwater flow from the site.
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Volatile Organic Compound (VOC)
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A carbon compound that vaporizes (becomes a gas) at normal room temperatures. VOCs contribute to air pollution directly and through atmospheric photochemical reactions to produce secondary air pollutants, principally ozone and peroxyacetyl nitrate.
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Walk-off Mat
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An exterior pad or grate designed to trap dust and debris.
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Waste Factor
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The percentage of framing material ordered in excess of the estimated material needed for construction.
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Wetland
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An area inundated or saturated by surface or ground water at a frequency and duration sufficient to support, and that under normal circumstances does support, a prevalence of vegetation typically adapted for life in saturated soil conditions (U.S. Code of Federal Regulations, Title 40, Part 232). Wetlands generally include swamps, marshes, bogs and similar areas.
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Zoning (Irrigation)
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Each type of bedding and associated irrigation is separated based on watering needs.
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