ANSI/ASHRAE/USGBC/IES Addenda a and b to

ANSI/ASHRAE/USGBC/IES Standard 189.1-2009

Standard for the Design of

High-Performance Green Buildings

Except Low-Rise Residential Buildings

Approved by the ASHRAE Standards Committee on June 26, 2010; by the ASHRAE Board of Directors on June 30, 2010; by the USGBC Board of Directors on June 5, 2010; by the IES Board of Directors on June 21, 2010; and by the American National Standards Institute on July 1, 2010.

These addenda were approved by a Standing Standard Project Committee (SSPC) for which the Standards Committee has established a documented program for regular publication of addenda or revisions, including procedures for timely, docu-mented, consensus action on requests for change to any part of the standard. The change submittal form, instructions, and deadlines may be obtained in electronic form from the ASHRAE Web site (www.ashrae.org), or in paper form from the ASHRAE Manager of Standards.

The latest edition of an ASHRAE Standard may be purchased on the ASHRAE Web site (www.ashrae.org) or from ASHRAE Customer Service, 1791 Tullie Circle, NE, Atlanta, GA 30329-2305, telephone: 404-636-8400 (worldwide), or toll free 1-800-527-4723 (for orders in the United States and Canada), or e-mail: orders@ashrae.org. For reprint permission, go to www.ashrae.org/permissions.

© 2010 American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. and U.S. Green Building Council.

A Jurisdictional Compliance Option of the International Green Construction Code™

Name

Kent W. Peterson, Chair*Nick Ferzacca, Vice-Chair*Stephen D. Kennedy, Vice-Chair*Mark M. MacCracken, Vice-Chair*John F. Hogan Chair (2006-2008)Leon E. Alevantis*James Benya*Harvey J. Bryan*Lee W. Burgett*Ron Burton*Paula Cino*Peyton Collie*Drury B. Crawley*John Phillip Cross*Lance L. DeLaura*Michael C. DeWeinWilliam M. Dillard*Jennifer R. Dolin (2006-2008)Anthony C. Floyd*Gregg Gress*Katherine G Hammack*Herman William Hoffman (2006-2008)Donald Horn*John Koeller*Thomas M. Lawrence*Carl N. Lawson*Jeffrey Levine (2006-2008)Richard Lord*Thomas J. Marseille*Merle F. McBrideJames Patrick McClendon*Molly E. McGuire*Claudia M. Newman (2006-2008)Brendan Owens (2006-2008)Teresa M. Rainey*Jeff Ross-Bain*Harvey M. SachsJoshua SaundersLawrence J. Schoen*Boggarm S. Setty*Jeffrey B. Stone*Wayne StoppelmoorRobert C. Thompson*Martha G. VanGeem*

Affiliation

P2S Engineering, Inc.Architectural Engineers, Inc.Georgia Power CompanyCalmac Manufacturing CorporationCity of SeattleCalifornia Department of Public HealthBenya Lighting DesignArizona State UniversityThe Trane CompanyBOMA InternationalNational Multi Housing CouncilSMACNAU.S. Department of EnergyAmerican Institute of Steel ConstructionSouthern California Gas CompanyBCAPMechanical Services of Central FloridaOSRAM SylvaniaCity of ScottsdaleInternational Code CouncilErnst and YoungAustin Water UtilityU.S. General Services AdministrationKoeller and CompanyUniversity of GeorgiaHanson Professional ServicesAIA/Fairfax CountyUnited Technologies Carrier CorporationStantecOwens CorningWalmarts Stores, IncorporatedTaylor EngineeringBricklin, Newman, DoldUS Green Building CouncilSkidmore, Owings, & MerrillRoss-Bain Green Building, LLCACEEEUnderwriters LaboratorySchoen EngineeringSetty & Associates Ltd.American Forest & Paper AssociationSchneider ElectricU.S. Environmental Protection AgencyCTL Group

ASHRAE Standard Project Committee 189.1Cognizant TC: TC 2.8, Building Environmental Impacts and Sustainability

SPLS Liaison: Allan FraserASHRAE Staff Liaison: Steven C. Ferguson

IES Liaison: Rita M. HarroldUSGBC Liaison: Brendan Owens

* Denotes members of voting status when the document was approved for publication

© American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. (www.ashrae.org). For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE's prior written permission.

ASHRAE STANDARDS COMMITTEE 2009-2010

Steven T. Bushby, Chair Merle F. McBride

H. Michael Newman, Vice-Chair Frank Myers

Robert G. Baker Janice C. PetersonMichael F. Beda Douglas T. ReindlHoy R. Bohanon, Jr. Lawrence J. SchoenKenneth W. Cooper Boggarm S. SettyK. William Dean Bodh R. SubherwalMartin Dieryckx James R. TaubyAllan B. Fraser James K. VallortKatherine G. Hammack William F. WalterNadar R. Jayaraman Michael W. WoodfordByron W. Jones Craig P. WrayJay A. Kohler Wayne R. Reedy, BOD ExOCarol E. Marriott Thomas E. Watson, CO

Stephanie C. Reiniche, Manager of Standards

SPECIAL NOTEThis American National Standard (ANS) is a national voluntary consensus standard developed under the auspices of the American

Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). Consensus is defined by the American National StandardsInstitute (ANSI), of which ASHRAE is a member and which has approved this standard as an ANS, as “substantial agreement reached bydirectly and materially affected interest categories. This signifies the concurrence of more than a simple majority, but not necessarily unanimity.Consensus requires that all views and objections be considered, and that an effort be made toward their resolution.” Compliance with thisstandard is voluntary until and unless a legal jurisdiction makes compliance mandatory through legislation.

ASHRAE obtains consensus through participation of its national and international members, associated societies, and public review.ASHRAE Standards are prepared by a Project Committee appointed specifically for the purpose of writing the Standard. The Project

Committee Chair and Vice-Chair must be members of ASHRAE; while other committee members may or may not be ASHRAE members, allmust be technically qualified in the subject area of the Standard. Every effort is made to balance the concerned interests on all ProjectCommittees.

The Manager of Standards should be contacted for:a. interpretation of the contents of this Standard,b. participation in the next review of the Standard,c. offering constructive criticism for improving the Standard, ord. permission to reprint portions of the Standard.

DISCLAIMERASHRAE uses its best efforts to promulgate Standards and Guidelines for the benefit of the public in light of available information and

accepted industry practices. However, ASHRAE does not guarantee, certify, or assure the safety or performance of any products, components,or systems tested, installed, or operated in accordance with ASHRAE’s Standards or Guidelines or that any tests conducted under itsStandards or Guidelines will be nonhazardous or free from risk.

ASHRAE INDUSTRIAL ADVERTISING POLICY ON STANDARDS

ASHRAE Standards and Guidelines are established to assist industry and the public by offering a uniform method of testing for ratingpurposes, by suggesting safe practices in designing and installing equipment, by providing proper definitions of this equipment, and by providingother information that may serve to guide the industry. The creation of ASHRAE Standards and Guidelines is determined by the need for them,and conformance to them is completely voluntary.

In referring to this Standard or Guideline and in marking of equipment and in advertising, no claim shall be made, either stated or implied,that the product has been approved by ASHRAE.

© American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. (www.ashrae.org). For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE's prior written permission.

2 ANSI/ASHRAE/USGBC/IES Addenda to ANSI/ASHRAE/USGBC/IES Standard 189.1-2009

(This foreword is not part of this standard. It is merelyinformative and does not contain requirements necessaryfor conformance to the standard. It has not beenprocessed according to the ANSI requirements for astandard and may contain material that has not beensubject to public review or a consensus process.Unresolved objectors on informative material are notoffered the right to appeal at ASHRAE or ANSI.)

FOREWORD

This addendum changes the daylighting definitions tocoincide with those in ASHRAE/IESNA Standard 90.1 to facil-itate consistent use of these terms. Some changes are seman-tic, such as changing from daylight zone to daylight area andchanging from adjacent to vertical fenestration to primarysidelight area. For the daylight area under skylights and underroof monitors, geometric relationships between obstructions,heights, and distances from glazing are provided to allow day-light areas to extend beyond obstructions where appropriate.Clerestory was deleted since roof monitor sufficientlydescribes roof elements other than skylights. The changes totoplighting are not substantive but are proposed to utilize thesame text as ASHRAE/IESNA Standard 90.1 to ensure consis-tent use. Effective aperture has been replaced with sidelightingeffective aperture, again to coincide with ASHRAE/IESNAStandard 90.1. For background documentation on the analysisused to derive sidelighting effective aperture, refer towww.h-m-g.com/ASHRAE_Daylighting.

Note: In this addendum, changes to the current standardare indicated in the text by underlining (for additions) andstrikethrough (for deletions) unless the instructions specifi-cally mention some other means of indicating the changes.

Modify the Definitions section of the standard as fol-lows.

Note: delete current Figures 3.1 through 3.5 andreplace with those provided in this addendum.

daylight zonearea:

a. adjacent to vertical fenestration (see Figure 3.1): thearea illuminated by vertical glazing, calculated as the day-lit depth multiplied by the daylit width, where the daylitdepth is the lesser of one window head height (headheight is the distance from the floor to the top of the glaz-ing) or the distance on the floor, perpendicular to the glaz-ing, to the nearest 56 in. (1.4 m) or higher permanentpartition; and the daylit width is the width of the windowplus, on each side, either the distance to a 56 in. (1.4 m) orhigher permanent partition or one-half the distance to theclosest skylight, roof monitor, clerestory, or vertical fenes-tration, or 2 ft (0.6 m), whichever is least. (See skylight,roof monitor, clerestory, tubular daylighting device, andvertical fenestration.) primary sidelighted area (See Fig-ure 3.1): The total primary sidelighted area is the com-bined primary sidelighted area without double-counting

overlapping areas. The floor area for each primary side-lighted area is directly adjacent to vertical fenestration inexterior wall with an area equal to the product of the pri-mary sidelighted area width and the primary sidelightedarea depth. The primary sidelighted area width is thewidth of the window plus, on each side, the smallest of:

1. 2 ft (0.6 m) or2. the distance to any 60 in. (1.5 m) or higher vertical

obstruction.

The primary sidelighted area depth is the horizontal distanceperpendicular to the glazing which is the smallest of:

1. the distance from the floor to the top of the glazingor

2. the distance to any 60 in (1.5 m) or higher verticalobstruction.

b. under skylights and tubular daylighting devices (seeFigure 3.2): the area illuminated by skylights, calculatedby adding the rough opening of the skylight plus, in each

Addendum a to Standard 189.1-2009

Figure 3.1 Section view and plan view of primary side-lighted area.

© American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. (www.ashrae.org). For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE's prior written permission.

ANSI/ASHRAE/USGBC/IES Addenda to ANSI/ASHRAE/USGBC/IES Standard 189.1-2009 3

of the lateral and longitudinal dimensions of the skylight,the lesser of 70% of the floor to- ceiling height, the dis-tance to the nearest 56 in. (1.4 m) or higher permanentpartition, or one-half the horizontal distance to the edge ofthe closest skylight,roof monitor, clerestory window, tubu-lar daylighting device, or vertical fenestration. (See sky-light, roof monitor, clerestory, tubular daylighting device,andvertical fenestration.). under skylight (see Figure3.2): The total daylight area under skylights is the com-bined daylight area without double-counting overlappingareas. The daylight area under skylights is bounded by theskylight opening, plus horizontally in each direction, thesmallest of:

1. 70% of the ceiling height [0.7 × CH] or 2. the distance to any daylight area under roof moni-

tors or 3. the distance to the front face of any vertical

obstruction where any part of the obstruction isfarther away from the nearest edge of the skylightopening than 70% of the distance between the topof the obstruction and the ceiling [0.7 × (CH –OH)].

where

CH ≡ the height of the ceiling at the lowestedge of the skylight

OH ≡ the height to the top of the obstruction

c. under clerestory (see Figures 3.3 & 3.5): the area illumi-nated by vertical fenestration in a roof monitor, calculatedby adding the rough opening of the roof monitor plus, ineach of the lateral and longitudinal dimensions of theopening, the lesser of 70% of the floor-to-ceiling height,

the distance to the nearest 56 in. (1.4 m) or higher perma-nent partition, or one-half the horizontal distance to theedge of the closest skylight, roof monitor, clerestory win-dow, or vertical fenestration. (See skylight, roof monitor,clerestory, tubular daylighting device, and vertical fenes-tration.)

c. d. under roof monitor (see Figures 3.3): the area illumi-nated by vertical fenestration in a clerestory, calculatedas the daylit depth multiplied by the daylit width, wherethe daylit depth is the lesser of 70% of the floor-to-ceil-ing height, the distance to the nearest 56 in. (1.4 m) orhigher permanent partition, or one half the horizontaldistance to the edge of the closest skylight, and the daylitwidth is the length of the window plus the lesser of 70%of the floor-to- height, the distance to the nearest 56 in.(1.4 m) or higher permanent partition, or one-half thehorizontal distance to the edge of the closest skylight,roof monitor, clerestory window, or vertical fenestrationin each longitudinal direction. (See skylight, roof moni-tor, clerestory, and vertical fenestration) The total day-light area under roof monitors is the combined daylightarea without double-counting overlapping areas. Thedaylight area under roof monitors is equal to the productof the width of the vertical fenestration above the ceilinglevel and the smallest of the following horizontal dis-tances inward from the bottom edge of the glazing:

1. the vertical distance from the floor to the bottomedge of the monitor glazing or

2. the distance to the edge of any primary sidelight-ing area or

Figure 3.2 Section view and plan view of daylight area under skylight.

Figure 3.3 Section view and plan view of daylight zone under roof monitor.

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4 ANSI/ASHRAE/USGBC/IES Addenda to ANSI/ASHRAE/USGBC/IES Standard 189.1-2009

3. the distance to the front face of any verticalobstruction where any part of the obstruction isfarther away than the difference between obstruc-tion height and the monitor sill height (MSH –OH).

toplighting: lighting building interiors with daylight admittedthrough fenestration located on the roof such as skylights androof monitors. daylighting provided by fenestration mountedabove the ceiling plane, including skylights, tubular daylight-ing devices, and vertical fenestration in roof monitors; andfenestration mounted above a lower adjacent ceiling plane inthe space in clerestories.

clerestory: see ASHRAE/IESNA Standard 90.1.

sidelighting effective aperture for vertical fenestration(EAvf): the product of the visible transmittance of the overallvertical fenestration product (entire rough opening, includingglass, sash, and frame) and the vertical fenestration area as apercentage of the gross wall area. the relationship of daylighttransmitted through windows to the primary sidelighted areas.The sidelighting effective aperture is calculated according tothe following formula:

where Window VLT is the visible light transmittance ofwindows asis determined in accordance with Section 5.8.2.6of ASHRAE/IESNA Standard 90.1. (See fenestration area,gross wall area, and vertical fenestration.)

7.4.6.5 Automatic Controls for Lighting in DaylightZonesAreas. Lighting in all daylight zonesareas, includingdaylight zones under skylights and daylight zones adjacent tovertical fenestration, where the combined daylight zone areaper enclosed space is greater than 250 ft2 (25 m2), shall beprovided with controls that automatically reduce lightingpower in response to available daylight by either:

a. Continuous daylight dimming, orb. A combination of stepped switching and daylight-sensing

automatic controls, which are capable of incrementallyreducing the light level in steps automatically and turningthe lights off automatically.

Exceptions to 7.4.6.5:1. Window display and exhibition lighting. ....8. Daylight zonesareas where the height of existing

adjacent structures above the window is at least twicethe distance between the window and adjacent struc-tures measured from the top of the glazing.

8.3.4.1 Minimum Daylight Zone Area by Toplight-ing. A minimum of 50% of the floor area directly under a roofin spaces with a lighting power density or lighting powerallowance greater than 0.5 W/ft2 (5 W/m2) shall be in the day-light zone area. Areas that are daylit shall have a minimumtoplighting area to daylight zone area ratio as shown in Table8.3.4.1. For purposes of compliance with Table 8.3.4.1, thegreater of the space lighting power density and the spacelighting power allowance shall be used.

8.4 Prescriptive Option

8.4.1 Daylighting by Sidelighting.

8.4.1.1 Minimum Sidelighting Effective Aperture.Office spaces and classrooms shall comply with the followingcriteria:

a. All north, south-, and east-facing facades for those spacesshall have a minimum sidelighting effective aperture forvertical fenestration (EAvf) as prescribed in Table 8.4.1.1.

b. The combined width of the primary sidelighted areasshall be at least 75% of the length of the façade wall.

b.c. Opaque interior surfaces in daylight zones areas shallhave visible light reflectances greater than or equal to80% for ceilings and 70% for partitions higher than 56 60in. (1.54 1.8 m) in daylightzones areas.

Exceptions to 8.4.1.1:

1. Spaces with programming that requires dark condi-tions (e.g. photographic processing).

2. Spaces with toplighting in compliance with 8.3.4.

3. Daylight zoneareas where the height of existingadjacent structures above the window is at least twicethe distance between the window and the adjacentstructures, measured from the top of the glazing.

8.5 Performance Option

8.5.1 Daylighting Simulation.

8.5.1.1 Usable Illuminance in Office Spaces andClassrooms. The design for the building project shall demon-strate an illuminance of at least 30 fc (300 lux) on a plane 3 ft(1 m) above the floor, within 75% of the area of the daylightzonesarea. The simulation shall be made at noon on the equi-nox using an accurate physical or computer daylightingmodel.

Sidelighting Effective ApertureWindow Area × Window VLT∑

Area of Primary Sidelighted Area---------------------------------------------------------------------------------=

TABLE 8.3.4.1 Minimum Toplighting Area

General Lighting Power Density or Lighting Power Allowances in Daylight Zone Area

W/ft2 (W/m2)

Minimum Toplighting

Area to Daylight

Zone Area Ratio

1.4 W/ft2 (14 W/m2) < LPD 3.6%

1.0 W/ft2 (10 W/m2) < LPD < 14 W/m2 (1.4 W/ft2) 3.3%

0.5 W/ft2 (5 W/m2) < LPD < 1.0 W/ft2 (10 W/m2) 3.0%

TABLE 8.4.1.1 Minimum Sidelighting Effective Aper-ture for Sidelighting Vertical Fenestration

Climate ZoneMinimum Sidelighting Effective Aperture for Sidelighting by Vertical Fenestration

1, 2, 3A, 3B 0.10

3C, 4, 5, 6, 7, 8 0.15

© American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. (www.ashrae.org). For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE's prior written permission.

ANSI/ASHRAE/USGBC/IES Addenda to ANSI/ASHRAE/USGBC/IES Standard 189.1-2009 5

(This foreword is not part of this standard. It is merelyinformative and does not contain requirements necessaryfor conformance to the standard. It has not beenprocessed according to the ANSI requirements for astandard and may contain material that has not beensubject to public review or a consensus process.Unresolved objectors on informative material are notoffered the right to appeal at ASHRAE or ANSI.)

FOREWORD

This addendum changes the height of Illuminance calcu-lations required for the performance option of daylightingsimulations from 3 ft (1 m) to 2.5 ft (0.8 m) to coincide withstandard industry practice.

Note: In this addendum, changes to the current standardare indicated in the text by underlining (for additions) and

strikethrough (for deletions) unless the instructions specifi-cally mention some other means of indicating the changes.

Modify the standard as follows.

8.5 Performance Option

8.5.1 Daylighting Simulation.

8.5.1.1 Usable Illuminance in Office Spaces andClassrooms. The design for the building project shall demon-strate an illuminance of at least 30 fc (300 lux) on a plane 3 2.5ft (1 0.8 m) above the floor, within 75% of the area of the day-light zones. The simulation shall be made at noon on the equi-nox using an accurate physical or computer daylightingmodel.

Addendum b to Standard 189.1-2009

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POLICY STATEMENT DEFINING ASHRAE’S CONCERN FOR THE ENVIRONMENTAL IMPACT OF ITS ACTIVITIES

ASHRAE is concerned with the impact of its members’ activities on both the indoor and outdoor environment. ASHRAE’s members will strive to minimize any possible deleterious effect on the indoor and outdoor environment of the systems and components in their responsibility while maximizing the beneficial effects these systems provide, consistent with accepted standards and the practical state of the art.

ASHRAE’s short-range goal is to ensure that the systems and components within its scope do not impact the indoor and outdoor environment to a greater extent than specified by the standards and guidelines as established by itself and other responsible bodies.

As an ongoing goal, ASHRAE will, through its Standards Committee and extensive technical committee structure, continue to generate up-to-date standards and guidelines where appropriate and adopt, recommend, and promote those new and revised standards developed by other responsible organizations.

Through its Handbook, appropriate chapters will contain up-to-date standards and design considerations as the material is systematically revised.

ASHRAE will take the lead with respect to dissemination of environmental information of its primary interest and will seek out and disseminate information from other responsible organizations that is pertinent, as guides to updating standards and guidelines.

The effects of the design and selection of equipment and systems will be considered within the scope of the system’s intended use and expected misuse. The disposal of hazardous materials, if any, will also be considered.

ASHRAE’s primary concern for environmental impact will be at the site where equipment within ASHRAE’s scope operates. However, energy source selection and the possible environmental impact due to the energy source and energy transportation will be considered where possible. Recommendations concerning energy source selection should be made by its members.

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9/2010

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