2020 National Green Building Standard ANSI Standard Revision Process Second Draft Request for Public Comment March 15, 2019 Foreword This Second Draft Standard is provided for the purpose of soliciting public comments on the changes to the first Draft Standard (Public Comment Draft dated September 28, 2018). Both Draft Standards and other relevant information are posted at www.homeinnovation.com/NGBS. Those Comments on Public Comment Draft that were Approved or Approved As Modified by the Consensus Committee at their February 11-13, 2019 meeting have been incorporated into this Second Draft Standard. The changes shown in the Second Draft Standard are now open for public comment. Only the changes shown in legislative format in the Second Draft Standard are open for public comment. The language that has not been changed is shown only for the purpose of providing context for review of the changes. Public comments are accepted through April 29, 2019 via a web-based form available at www.homeinnovation.com/NGBS. Instructions for submitting public comments are included with the web-based form. Note: Prior to publication, the 2020 edition of the NGBS will be editorially reviewed for spelling, grammar, format, numbering, and other editorial errors and improvements. This review will take place after all substantive changes will have been processed by the Consensus Committee. Suggested editorial corrections are welcome and should be emailed to [email protected]. CHAPTER 1 SCOPE AND ADMINISTRATION 101 GENERAL 101.1 Title. The title of this document is the National Green Building Standard™, hereinafter referred to as “this Standard.” 101.2 Scope. The provisions of this Standard shall apply to the design, construction, alteration, enlargement, and renovation of (1) all residential buildings, (2) residential portions of mixed-use buildings, or (3) mixed-use buildings where the residential portion is greater than 50 percent of the gross floor area. This Standard shall also apply to subdivisions, building sites, building lots, and accessory structures. 101.2.1 Residential Designation. For the purpose of this standard, all Group R occupancies as defined by the International Building Code and all buildings within the scope of the International Residential Code shall be considered residential. Assisted living facilities, residential board and care facilities, and group homes classified as an I-1 occupancy as defined by the International Building Code shall also be considered residential. 101.3 Intent. The purpose of this Standard is to establish criteria for rating the environmental impact of design and construction practices to achieve conformance with specified performance levels for green residential buildings, renovation thereof, accessory structures, building sites, and subdivisions. This Standard is intended to provide flexibility to permit the use of innovative approaches and techniques. This Standard is not intended to abridge safety, health, or environmental requirements contained in other applicable laws, codes, or ordinances. 101.4 Referenced documents. The codes, standards, and other documents referenced in this Standard shall be considered part of the requirements of this Standard to the prescribed extent of each such reference. The edition of the code, standard, or other referenced document shall be the edition referenced in Chapter 13. 101.5 Appendices. Where specifically required by a provision in this Standard, that appendix shall apply. Appendices not specifically required by a provision of this Standard shall not apply unless specifically adopted. 102 CONFORMANCE 102.1 Mandatory practices. This Standard does not require compliance with any specific practice except those noted as mandatory. 102.2 Conformance language. The green building provisions are written in mandatory language by way of using the verbs “to be,” “is,” “are,” etc. The intent of the language is to require the user to conform to a particular practice in order to qualify for the number of points assigned to that practice. Where the term “shall” is used, or the points are designated as “mandatory,” the provision or practice is mandatory. 102.3 Documentation. Verification of conformance to green building practices shall be the appropriate construction documents, architectural plans, site plans, specifications, builder certification and sign-off, inspection reports, or other data that demonstrates conformance as determined by the Adopting Entity. Where specific documentation is required by a provision of the Standard, that documentation is noted with that provision. 102.4 Alternative compliance methods. Alternative compliance methods shall be acceptable where the Adopting Entity finds that the proposed green building practice meets the intent of this Standard. SECTION 103 ADMINISTRATION 2020 NATIONAL GREEN BUILDING STANDARDTM – SECOND DRAFT 1 SCOPE AND ADMINISTRATION 103.1 Administration. The Adopting Entity shall specify performance level(s) to be achieved as identified in Chapter 3 and shall provide a verification process to ensure compliance with this Standard. 2 2020 NATIONAL GREEN BUILDING STANDARDTM – SECOND DRAFT CHAPTER 2 DEFINITIONS 201 GENERAL 201.1 Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this Standard, have the meanings shown in this chapter. 201.2 Interchangeability. Words used in the present tense include the future; words stated in the masculine gender include the feminine and neuter; the singular number includes the plural and the plural, the singular. 201.3 Terms defined in other documents. Where terms are not defined in this Standard, and such terms are used in relation to the reference of another document, those terms shall have the definition in that document. 201.4 Terms not defined. Where terms are not defined through the methods authorized by this section, such terms shall have ordinarily accepted meanings such as the context implies. SECTION 202 DEFINITIONS ACCESSORY STRUCTURE. A structure, the use of which is customarily accessory to and incidental to that of the residential building; the structure is located on the same lot or site as the residential building; the structure does not contain a dwelling unit or a sleeping unit; and (1) is classified as Group U – Utility and Miscellaneous in accordance with the ICC International Building Code, or (2) is classified as accessory in accordance with the ICC International Residential Code, or (3) is classified as accessory to the residential use by a determination of the Adopting Entity. ADDITION. An extension or increase in the conditioned space floor area or height of a building or structure. ADOPTING ENTITY. The governmental jurisdiction, green building program, or any other third-party compliance assurance body that adopts this Standard, and is responsible for implementation and administration of the practices herein. ADVANCED FRAMING. Code compliant layout, framing and engineering techniques that minimize the amount of framing products used and waste generated to construct a building while maintaining the structural integrity of the building. AFUE (Annual Fuel Utilization Efficiency). The ratio of annual output energy to annual input energy which includes any non-heating season pilot input loss, and for gas or oil-fired furnaces or boilers, does not include electrical energy. AIR BARRIER. Material(s) assembled and joined together to provide a barrier to air leakage through the building envelope. An air barrier may be a single material or a combination of materials. AIR HANDLER. A blower or fan used for the purpose of distributing supply air to a room, space, or area. AIR INFILTRATION. The uncontrolled inward air leakage into a building caused by the pressure effects of wind or the effect of differences in the indoor and outdoor air density or both. AIR, MAKE-UP. Air that is provided to replace air being exhausted. ARCHITECTURAL COATINGS. A material applied onto or impregnated into a substrate for protective, decorative, or functional purposes. Such materials include, but are not limited to, primers, paints, varnishes, 2020 NATIONAL GREEN BUILDING STANDARDTM – SECOND DRAFT 3 DEFINITIONS sealers, and stains. An architectural coating is a material applied to stationary structures or their appurtenances at the site of installation. Coatings applied in shop applications, sealants, and adhesives are not considered architectural coatings. AREA OF HIGH INTERSECTION DENSITY. An area whose existing streets and sidewalks create at least 90 intersections per square mile (35 intersections per square kilometer). AUTHORITY HAVING JURISDICTION (AHJ). An agency or agent responsible for enforcing this code. BALANCED VENTILATION. Any combination of concurrently operating mechanical exhaust and mechanical supply whereby the total mechanical exhaust airflow rate is within 10% of the total mechanical supply airflow rate. BIOBASED PRODUCT. A commercial or industrial material or product that is composed of, or derived from, in whole or in significant part, biological products or renewable agricultural materials, including plant, animal, and marine materials, or forestry materials BROWNFIELD (also EPA-Recognized Brownfield). A site in which the expansion, redevelopment or reuse of would be required to address the presence or potential presence of a hazardous substance, pollutant or contaminant. Brownfield sites include: • EPA-recognized brownfield sites as defined in Public Law 107-118 (H.R. 2869) “Small Business Liability Relief and Brownfields