LEED Reference Guide - Precast...

LEED Reference GuideFor Precast Concrete Products

PRESTRESS/STRUCTURAL PRODUCTS

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LEED Reference Guide for Precast Concrete Products • www.precast.org

National Precast Concrete Association 1320 City Center Dr. Suite 200, Carmel, IN 46032 (800) 366-7731 | www.precast.org

This publication is designed to provide accurate and authoritative information in regard to the subject matter covered; however, National Precast Concrete Association acts as a mediator without approving, disapproving or guaranteeing the validity or accuracy of any data, claim or opinion appearing herein. Information is provided and disseminated with the understanding that the National Precast Concrete Association is not engaged in rendering engineering, legal or any other professional services. If engineering, legal or other professional assistance is required, the services of a competent professional should be obtained. The National Precast Concrete Association does not assume and hereby disclaims liability to any person for any loss or damage caused by errors or omissions in the material contained herein, regardless of whether such errors result from negligence, accident or any other cause whatsoever.

The Credit Requirements listed in this document are contained within the Leadership in Energy and Environmental Design Green Building Rating System developed by the United States Green Building Council. For more information on the LEED Green Building Rating System, please visit www.usgbc.org.

For additional information about using precast concrete within the LEED system, please visit www.precast.org

LEED 2009 New Construction• SS5.1–SiteDevelopment:ProtectorRestoreHabitat…….….………. ......................................... 3• SS5.2–SiteDevelopment:MaximizeOpenSpace ......................................................................... 4• IEQ4.3–LowEmittingMaterials:FlooringSystems ....................................................................... 5• MR4–RecycledContent…………………………………………………. .......................................... 6• MR5–RegionalMaterials……………………………………………….… ......................................... 7

LEED 2008 Homes• MR1.5–MaterialEfficientFraming:Off-SiteFabrication ................................................................. 8• MR2.2–EnvironmentallyPreferableProducts ................................................................................ 9• MR3–WasteManagement ........................................................................................................... 10•MR5–RegionalMaterials...............................................................................................................11

LEED 2009 Neighborhood Development•GIB7–MinimizedSiteDisturbanceinDesignandConstruction ................................................... 12• GIB15–RecycledContentinInfrastructure ................................................................................... 13

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Precast ContributionCredit Requirement Max. Points: 1

PRESTRESS/STRUCTURAL

LEED New Construction

SS 5.1Sustainable Sites

Site Development –Protect or Restore Habitat

Site Development – Protect or Restore Habitat Case 1 – Greenfield SitesLimitallsitedisturbancestothefollowingparameters: • 40feetbeyondthebuildingperimeter • 10feetbeyondsurfacewalkways,patios,surfaceparkingand utilitieslessthan12inchesindiameter • 15feetbeyondprimaryroadwaycurbsandmainutilitybranch trenches • 25feetbeyondconstructedareaswithpermeablesurfaces (such as pervious paving areas, stormwater detention facilitiesandplayingfields)thatrequireadditionalstaging areas to limit compaction in the constructed area, or

Case 2 – Previously Developed AreasRestoreorprotectaminimumor50%ofthesite(excludingthebuildingfootprint)or20%ofthetotalsitearea(includingbuildingfootprintarea),whicheverisgreater,withnativeoradaptedvegetation.

See the LEED Canada guide for information on Canada’s credit requirements.

Precast concrete products are cast and cured in the plant and delivered to the site ready to set. The impact on theconstructionsiteissignificantlyreducedbecausethereisnoformwork,less construction waste, less noise and fewerlaborersneededon-site.

Precastcomponentsalsomakeiteasiertofitintotightspaceswithaminimumof site disturbance and shorter intallation times.

In addition, precast products can be custom-builttonearlyanyspecification.Because the products are ready to install,theycanbestagedoff-siteanddeliveredonaschedulethatkeepsimpact to the site at a minimum.

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SS 5.2Sustainable Sites

Site Development –Maximize Open Space

Site Development – Maximize Open SpaceCase 1: Sites with Local Zoning Open Space RequirementsReduce the footprint and/or provide vegetated open space within theprojectboundarysuchthattheamountofopenspaceexceedslocalzoningrequirementsby25%.

Case 2: Sites with No Local Zoning Requirements (such as someuniversitycampuses,militarybases)Provide a vegetated open space area adjacent to the building that is equal in area to the building footprint.

Case 3: Sites with Zoning Ordinances by No Open SpaceProvidedvegetatedopenspaceequalto20%oftheprojectsitearea.

ALL CASESForprojectsinareasthatearnSSCredit2:DevelopmentDensityand Community Connectivity, vegetated roof areas can contribute to credit compliance.ForprojectsinurbanareasthatearnSSCredit2:DevelopmentDensityandCommunityConnectivity,pedestrian-orientedhardscape areas can contribute to credit compliance. For such projects,aminimumof25%oftheopenspacecountedmustbevegetated.Wetlandsornaturallydesignatedpondsmaycountasopenspaceandthesideslopegradientsaverage1:4(vertical:horizontal)orless and are vegetated.

Precast concrete structural products canhelpmaximizeopenspacewhenusedinparkinggaragestructures.Theseprecast components can help reduce the overall footprint required for paved parking,allowingformorevegetatedopen space.

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Precast Contribution

Credit Requirement Max. Points: 1PRESTRESS/

STRUCTURALLEED New Construction

IEQ 4.3Indoor Environmental

Quality

Low Emitting Materials Flooring Systems

Option 1All flooring must comply with the following as applicable to the projectscope:• Allcarpetinstalledinthebuildinginteriormustmeetthetestingand product requirements o of the Carpet and Rug Institute Green Label Plus program.• Allcarpetcushioninstalledinthebuildinginteriormustmeetthe requirements of the Carpet and Rug Institute Green Label program.• AllcarpetadhesivemustmeettherequirementsofIEQCredit4.1:AdhesivesandSealants,whichincludesavolatileorganiccompound(VOC)limitof50g/L.• AllhardsurfaceflooringmustbecertifiedascompliantwiththeFloorScore2standard(currentasofthisdateofthisratingsystem),ormorestringentversionbyanindependentthirdparty.Flooring products covered by FloorScore include vinyl, linoleum, laminate flooring, wood flooring, ceramic flooring, rubber flooring and wall base.• AnalternativecompliancepathusingFloorScoreisacceptableforcreditachievement:100%ofthenon-carpetfinishedflooringmustbeFloorScore-certifiedandmustconstituteatleast25%ofthefinishedfloorarea.Examplesofunfinishedflooringincludefloors in mechanical rooms, electrical rooms and elevator service rooms.• Concrete,wood,bambooandcorkfloorfinishessuchassealer,stainandfinishmustmeettherequirementsofSouthCoastAirQualityManagementDistrict(SCAQMD)Rule113,ArchitecturalCoatings,rulesineffectonJan.1,2004.• Tile-settingadhesivesandgroutmustmeetSCAQMDRule1168.VOClimitscorrespondtoaneffectivedateofJuly1,2005,andruleamendmentdateofJan.7,2005.

Option 2All flooring elements installed in the building interior must meet the testing and product requirements of the California Department ofHealthServicesStandardPracticefortheTestingofVolatileOrganicEmissionsfromVariousSourcesUsingSmall-ScaleEnvironmentalChambers,including2004Addenda.

Precast concrete prestressed/structural products such as double tees, wall panels, hollow core slabs, flat slabs andI-beamgirderscancontributetoward this credit, because precast concretedoesnotemitVolatileOrganicCompounds(VOCs).

Anysealers,stainsorfinishesmustmeettheSouthCoastAirQualityManagementDistrict’sRule1113onArchitectural Coatings.

Architectural precast tiles and pavers can also contribute toward this credit when setting with adhesives and grouts that meetRule1168onVOClimits.

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Credit Requirement Max. Points: 2



MR 4Materials and Resources

Recycled Content

Precast concrete products may contain supplementary cementitious materials such as fly ash and blast furnace slag which will add to the project’s recycled content goals.

Precast products may also contain rebar and welded wire mesh which is often made from recycled steel.

Otherlessfrequentlyusedrecycledcontent components include various fiberreinforcements,glassaggregates,silica fume, and recycled crushed concrete.

The NPCA LEED calculator helps members respond with the proper documentation required for this credit. Simply input the Zip Code/Postal Code and weight for each component to generateapdffilethatcanbee-maileddirectly to the LEED AP, contractor or architect.

Recycled Content Points

10% 1

20% 2

Recycled Content RequirementsUse materials with recycled content such that the sum of postconsumerrecycledcontentplus1/2thepreconsumercontentconstitutesatleast10%or20%(basedoncost)ofthetotalvalueof the materials in the project. The minimum percentage materials recycledforeachpointthresholdis:

The recycled content value of a material assembly is determined by weight. The recycled fraction of the assembly is then multiplied by the cost of the assembly to determine the recycled content value.

Mechanical,electricalandplumbingcomponentsandspecialtyitems such as elevators cannot be included in this calculation. Include only materials permanently installed in the project. FurnituremaybeincludedifitisincludedconsistentlyinMRCredit3:MaterialsReusethroughMRCredit7:CertifiedWood.

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Credit Requirement Max. Points: 2 Precast Contribution




Regional Materials

Because concrete uses plentiful and natural raw materials, concrete componentscanbeextracted,harvestedandmanufacturedwithin500miles of the project site. Using locally obtained raw materials helps reduce transportation distances which reduces the environmental impact of carbon emissions.

If shipping is done by rail or water, LEEDCanadaallowsupto2,400km(1,500miles)fromboththemanufacturing site to the project site and the location where building materialsareextracted,harvested,recovered and processed to the manufacturing site.

The NPCA LEED Calculator helps provide the proper documentation required for this credit. Simply input the Zip code where each raw material originates and the weight of each materialtogenerateaprintablefilethatcanbee-mailedtotheLEEDAP,contractor or architect.

Regional Materials

Usematerialsorproductsthathavebeenextracted,harvested,andmanufacturedwithin500milesoftheprojectsite.

Thecalculationisbasedontheoverallmaterialscost.Materialscostsincludeallexpensestodeliverthematerialtotheprojectsite.Materialscostsshouldaccountforalltaxesandtransportationcostsincurredbythecontractorbutexcludeanycost for labor and equipment once the material has been delivered to the site.

Regional Materials of 10% = 1 point Regional Materials of 20% = 2 points

See the NPCA LEED Calculator at www.precast.org/leed for help with this credit.


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LEED Homes

MR 1.5Materials and Resources

Materials-Efficient Framing –

Off-Site Fabrication


Material-Efficient Framing -- Off-site FabricationUseeitherofthefollowingalternativestoon-siteframing:

a)Panelizedconstruction.Wall,roofandfloorcomponentsare deliveredtothejobsitepre-formed.

b)Modular,prefabricatedconstruction.Allprincipalbuilding sections are delivered to the job site as prefabricated modules.

For the complete credit, prerequisite and additional information, pleasevisitwww.usgbc.orgtodownloadthefreeLEEDHomesGuide.

Precast architectural wall panels and foundationsarepanelizedandcreatedat the plant, which helps create less framing waste on the job site.

In some cases, precast components can include the wall, roof and floor as one completeunit–readytosetandinstall–saving installation time and labor on the job site.

In addition, precast construction reducesairleakagethroughfewerjointsandsignificantlydecreaseson-siteconstruction waste.

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LEED Homes

MR 2.2Materials and Resources

Environmentally Preferable Products



Environmentally Preferable Products

(.5 point each, maximum 8 points)

Use building component materials that meet one or more of the criteriabelow:

• Environmentallypreferableproducts.0.5pointsforusing afoundationwith30%flyash/slag.Anadditional.5pointfor exemplaryperformanceof50%flyash/slag,and/or

• LowEmissions(notapplicableforconcrete),and/or

• LocalProduction.0.5pointsforusingafoundationthatwas extracted,processed,andmanufacturedwithin500milesof the project site.

Precast concrete products may contain supplementary cementitious materials such as fly ash and blast furnace slag, which will add to the project’s recycled content goals. Because concrete uses plentiful and natural raw materials, concrete componentscanbeextracted,harvestedandmanufacturedwithin500miles of the project site. Using locally obtained raw materials helps reduce the environmental impact of carbon emissions.The NPCA LEED calculator helps members respond with the proper documentation required for this credit. Simply input the Zip Code/Postal Code and weight for each component to generateapdffilethatcanbee-maileddirectly to the LEED AP, contractor or architect.

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LEED Homes


Waste Management



Construction Waste Reduction3.1 Construction Waste Management Planning (Prerequisite)Investigate and document local options for diversion, then document the diversion rate for construction waste. (See LEED Homesguideforfullprerequisite)

3.2 Construction Waste ReductionReduce or divert waste generated from new construction activitiesfromlandfillsandincineratorstoalevelbelowtheindustrynorm.Useeitherofthetwooptions: a)ReducedConstructionWaste.Generate2.5poundsor less of net waste (not including waste diverted reclamation orrecycling)persquarefootofconditionedfloorarea.Use the table to determine the score. b)IncreasedWasteDiversion.Divert25%ofmoreofthe totalmaterialstakenofftheconstructionsitefromlandfills and incinerators. Use the table to determine the score. Calculate the percentage using either weight or volume.

Thiscreditallowsfor2.5poundsofconstruction waste per square foot of floor space. Precast concrete can contribute toward this credit because it is plant produced, which creates little to zeroon-siteconstructionwaste.

Lesson-sitewastemeanslesstransportationofwaste,lessclean-up time, and less time spent sorting recyclables. These savings can contributetoaquicker,cheaperprojectandamoreefficientconstructionschedule.

AMOUNT TO LANDFILLS AND INCINERATORS

Reduced Construction Waste

Lbs./Ft.2

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

Increased Waste Diversion

Cubic Yds./1,000 Ft.2

25.5

22.3

19.1

15.9

12.8

9.6

6.4

3.2

% Waste

100.0%

88%

75%

63%

50%

38%

25%

13%

% Diverted

0%

13%

25%

38%

50%

63%

75%

88%

Points

0.0

0.0

0.5

1.0

1.5

2.0

2.5

3.0

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LEED Homes


Regional Materials


Because concrete uses plentiful and natural raw materials, concrete componentscanbeextracted,harvestedandmanufacturedwithin500miles of the project site. Using locally obtained raw materials helps reduce transportation distances which reduces the environmental impact of carbon emissions.

If shipping is done by rail or water, LEED Canadaallowsupto2,400km(1,500miles)fromboththemanufacturingsite to the project site and the location wherebuildingmaterialsareextracted,harvested, recovered and processed to the manufacturing site.

The NPCA LEED Calculator helps provide the proper documentation required for this credit. Simply input the Zip code where each raw material originates and the weight of each materialtogenerateaprintablefilethatcanbee-mailedtotheLEEDAP,contractor or architect.

Regional Materials

Usematerialsorproductsthathavebeenextracted,harvested,andmanufacturedwithin500milesoftheprojectsite.

Thecalculationisbasedontheoverallmaterialscost.Materialscostsincludeallexpensestodeliverthematerialtotheprojectsite.Materialscostsshouldaccountforalltaxesandtransportationcostsincurredbythecontractorbutexcludeanycost for labor and equipment once the material has been delivered to the site.

Regional Materials of 10% = 1 point Regional Materials of 20% = 2 points



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LEED Neighborhood Development

GIB 7Green Infrastructure

and Buildings

Minimized SiteDisturbance in Design

and Construction

Minimized Site Disturbance in Design and Construction

Option 1: Development Footprint on Previously Developed Land: Locate100%ofthedevelopmentfootprintonareaspreviouslydeveloped, or

Option 2: Undeveloped Portion of Project Left UndisturbedLimitdisturbanceto:• 40feetbeyondthebuildingperimeter• 10feetbeyondsurfacewalkways,patios,surfaceparkingand utilitieslessthan12inchesindiameter• 15feetbeyondstreetcurbsandmainutilitybranchtrenches• 25feetbeyondconstructedareaswithpermeablesurfaces that require additional staging areas to limit compaction in the constructedzone.

Note: This is a condensed version of the credit. The full credit may be downloaded from USGBC’s Neighborhood Development Guide.


Precast concrete products are plant cast and delivered to the site ready to set so they reduce the staging area required which can reduce the overall site disturbance.

The impact on the construction site is also reduced because there is no additionalformwork,whichoftenrequires more construction area for above-groundproductsandlargerexcavationareasforundergroundproducts.

Less impact on sites can reduce construction waste, shorten the construction schedule and require fewer laborerson-site.

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LEED Neighborhood Development

GIB 15Green Infrastructure

and Buildings

Recycled Content in Infrastructure


Recycled Content in Infrastructure Use materials for new infrastructure such that the sum of postconsumerrecycledcontent,in-placereclaimedmaterialsandone-halfofthepreconsumerrecycledcontentconstitutesatleast50%ofthetotalmassofinfrastructurematerials.

Count materials in all of the following infrastructure items as applicabletotheproject:

• Roadways,parkinglots,sidewalks,unitpaving,andcurbs • Waterretentiontanksandvaults • Baseandsubbasematerialsfortheabove • Stormwater,sanitarysewer,energydistribution,andwater piping



Precast concrete products may contain supplementary cementitious materials such as fly ash and blast furnace slag which will add to the project’s recycled content goals.

Precast products may also contain rebar and welded wire mesh which containsrecycledsteel.Otherlessfrequently used recycled content componentsincludevariousfiberreinforcements, glass aggregates, silica fume, and recycled crushed concrete.

Beyond precast products themselves, recycled crushed concrete can also contributetothiscreditwhenutilizedasroadfillbase.

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