GreenGov 2011 GreenFacilities S2 KenSandler

8/12/2019 GreenGov 2011 GreenFacilities S2 KenSandler

1/20

2011GreenGovSymposium

Oct.31Nov.2,2011

WashingtonHiltonWashington,DC

GreenFacilities

Session

2

EconomicValueofGreenFacilities October31,2011

Green Roofs: Benefits, Costs,Green Roofs: Benefits, Costs,

Challenges & OpportunitiesChallenges & Opportunities

KenSandlerSustainability andGreenBuildingAdvisor

USGeneral

Services

Administration

PresentationTitle


2/20

GreenFacilities

Session

2


Green Roofs: Benefits, Costs, ChallengesGreen Roofs: Benefits, Costs, Challenges

& Opportunities& Opportunities

US Census Bureau Headquarters, Suitland, MD


3/20

GreenFacilities

Session

2


What YouWhat Youll Hear From Mell Hear From Me

GSAsGreenRoofStudy

Whyweconductedit

Ourgoalsandmethodology

Findings

Benefits environmental,

economic,

social

Costbenefitanalysis

Sowhatsthebottomline?


4/20

GreenFacilities

Session

2


GSAGSAs Green Roof Studys Green Roof Study

NOAA Operations Center, Suitland, MD


5/20

GreenFacilities

Session

2


GSAGSAs Green Roof Studys Green Roof Study

MandatedbyCongress

GreatopportunitytoexamineatechnologyGSAhas

embraced

Over1millionsquarefeetofgreenroofsinourinventory

Targeted

at

decision

makers

Disclaimer:allconclusionspreliminaryuntilreport

released


6/20

GreenFacilities

Session

2


ApproachApproach

Literaturereviewof200reports,casestudies&research

papers,plusinterviewsw/experts

Broadfocus

on

green

roofs

on

commercial

and

public

buildings

Analysisofbenefits

Costbenefitanalysis,forUSandWashington,DCregion

Challenges&bestpracticestomaximizebenefits

Researchanddataneeds


7/20

GreenFacilities

Session

2


Benefits of Green RoofsBenefits of Green Roofs

EPA Region 8, Denver, CO


8/20

GreenFacilities

Session

2


Benefits AnalyzedBenefits Analyzed

Stormwaterrunoff

Urbanheatislandeffectandenergysavings

Biodiversityandhabitat

Airquality

Acousticsandqualityoflife

Jobsandurbanagriculture

Rooflongevity


9/20

GreenFacilities

Session

2


Stormwater RunoffStormwater Runoff

Greenroofshavebeenshownto:

Reducestormwatervolumeandflow

Capture

and

retain

first

inch

of

rainfall

in

astorm.

Retainfrom38%~100%ofprecipitation.

Reducerateofrunofffromaroofbyupto65%

Add

3hours

to

the

time

it

takes

runoff

to

leave

aroof.

Reducestormwaterpollutants

Neutralizeacidityofacidrain

Reduce

stormwater

flow

and

volume,

thereby

reducing

pollutants

sweptintowaterbodies

Butimpactsonnutrientpollutantreductionseemmixed


10/20

GreenFacilities

Session

2


Urban Heat Island Reduction andUrban Heat Island Reduction and

Energy SavingsEnergy Savings

Greenroofshavebeenshownto:

Reducetheheatislandeffect:

Lowersurfacetemperatures

Createacoolingeffect

Reducebuildingenergyuse:

Reducebuildings summersolarheatgain,byupto84%

Reducebuildingenergyuse,especiallyinsummer

PotentiallyreducestrainonHVACsystems


11/20


12/20


13/20

GreenFacilities

Session

2


Acoustics and Quality of LifeAcoustics and Quality of Life

Acoustics:

Betteratnoisereductionthantraditionalandconcreteroofs,

perunit

of

weight

Reductionontopfloorof8decibelsormore

Biophilia:

Evidencethatmoreexposuretogreenerycanincrease

occupanthealthandproductivity


14/20

GreenFacilities

Session

2


Job Creation and Urban AgricultureJob Creation and Urban Agriculture

Jobcreation:

USgreenroofjobsrose>80%from2004to2005

Germangreenroofindustrygrowing15%20%/yearsince1982

Urbanagriculture potentialto:

Reducedistance

food

travels

to

reach

consumers,

thereby

reducingenergyuse&carbonemissions

Providefresh,localfoodoptionswithlesspesticides

Helpcreate

jobs

and

increase

property

values


15/20

GreenFacilities

Session

2


Roof LongevityRoof Longevity

Results:

Longevityestimatedfrom2560years aboutdoublethe

lifespanof

conventional

roofs

Howgreenroofsdoit:

Vegetationlayerandgrowingmediumprotecttheroofing

membranefromdamagingUVradiationandfromfluctuationsintemperatureextremes


16/20

GreenFacilities

Session

2


Green Roof Costs and BenefitsGreen Roof Costs and Benefits

10 West Jackson, Chicago, Ill inois


17/20

GreenFacilities

Session

2


Green Roof Costs and BenefitsGreen Roof Costs and Benefits

Addedcostofinstallingagreenroofismostlymadeupforbyitsincreasedlongevity

Added

maintenance

costs

are

significant Keybenefitstobuildingowners=reducedstormwaterand

energycosts;realestatebenefits(rent,value,etc.)

Keybenefits

to

community

=reduced

infrastructure

maintenanceorreplacementcosts,improvedaesthetics,biodiversity,jobgeneration

Over

50

year

period,

stormwater,

energy,

carbon

and

communitybenefitsofgreenroofsexceededincreasedpremiumofinstalling,maintaining&replacingthem


18/20


19/20

GreenFacilities

Session

2


ConclusionsConclusions

Significantbenefits

Especiallystormwater,energy,heatislands,biodiversity

Addedinstallation

and

maintenance

costs

can

be

offset

byrooflongevityandpayback

Most

challenges

surmountable

through

best

practices

Overthebuildinglifecycle,returnoninvestmentplus

communitybenefitsgenerallyjustifiestheaddedcosts


20/20

GreenFacilities

Session

2


Thanks for your timeThanks for your time

KenSandler

GSA

OfficeofFederalHighPerformance

GreenBuildings

[email protected]

202219

1121

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GreenGov 2011 GreenFacilities S2 KenSandler