greenroofshelsinki presentation 1.0 - october 10, 2011

7/30/2019 GreenroofsHelsinki Presentation 1.0 - October 10, 2011

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What You Need t o do More of , Bet t er, andWhat You Need t o do More of , Bet t er, andDif f erent l y When It Comes t o Green Roof s:Dif f erent l y When It Comes t o Green Roof s:

Lessons Learned from 10 Years of Green RoofLessons Learned from 10 Years of Green Roof

Research and Const ruct ion in Nort h Am er icaResearch and Const ruct ion in Nort h Am er ica


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Part 1Par t 1 -- Current St at e of Know ledge andCur rent St at e of Know ledge andResearch NeedsResearch Needs

RogerRoger Grot heGrotheJakeJake Grot heGrotheAloha Landscapi ngAloha Landscapi ng


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Aloha Landscapi ng

High Prof i l e Comm erci al Landscape Design/ Buil d Comp any

Green Roof Design Buil d Company

Green Roof Product Innovator

Green Roof Educator

Designed and Installed over 40,000 m2 of Green Roofs

Helped t o Design and Inst all t he First Green Roof on Guam

2009 Landscaper of t he Year

2010 Envir onment al Leadership Aw ard


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Green Roof Def ined

Creat ing a green space on t op of ahuman-m ade st ruct ure


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Green Roof s Com e in Al l Shapes

and Sizes


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and Sizes


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and Sizes


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and Sizes


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and Sizes


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and Sizes


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and Sizes


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and Sizes


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and Sizes


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Grow t h of t he Nort h Am erican

Green Roof Indust ry

0

100 000

200 000

300 000

400 000

500 000

600 000

700 000

800 000

2004 2005 2006 2007 2008 2009 2010

Year

S

q

u

a

r

e

Me

t

e

r

s


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Annual % Grow t h of t he Nort hAm er ican Green Roof Indust ry

Year

P

e

r

ce

n

t

a

ge

G

r

o

0

10

20

30

4050

60

70

80

2005 2006 2007 2008 2009 2010


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Shi f t From Novel t o Necessary

Percent age of Pri vat e Proj ect s is Cat ching Up Wit hGovernm ent St im ulus Green Roof Proj ect s

Depressed Com m erci al Proper t ies Are Looking t o Green

Roof s t o Help Incr ease Prop er t y Values

Devel oper s are Using Green Roof s t o Help Increase t heOveral l Size of t he Buil ding Foot pr int

Rapid Growth Requires Aggressive Environmental OffsetsProvi ded by Green Roof s


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Percent age of Pri vat e Proj ect s is Cat ching UpWit h Governm ent St im ulus Green Roof Proj ect s

Devel oper s and Buildi ng Ow ners Are Reali zing t heEconom ic, Environm ent al, and Social Benefi t ofInvest ing in Green Roofs Wit h or Wit hout GovernmentIncentives

Gener al Mil l s Worl d HQInt ensive/ Ext ensiveGreen Roof Sculp t ureGarden


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Depr essed Com m erci al Proper t ies Are Looking t oGreen Roof s t o Help Incr ease Propert y Values

Proper t y Managers/ Ow ners are Realizing That GreenSells


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Devel opers are Using Green Roof s t o Hel p Increaset he Overall Size of t he Buil ding Foot pr int

Retention Ponds Consume Valuable Land

Focus Poll ut ant s in a Single Area and Can Lead t o Wat erSupp ly Probl em s


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Rapid Grow t h Requi res Aggressive Envi ronm ent alOf f set s Provided by Green Roof s

A 2.5 cm Rainf al l Hit t ing . 4 Hect are of Asphalt Yields102,206 Lit ers of Wat er Where Wil l i t Go?

Tradi t ional Buil ding Mat eri als Especial ly Roof ing

Absorbs and Ret ains Heat Creat ing a Heat Isl andEf fect .

Loss of Green Space to Impervious Surfaces RequiresCreat ing New Green Spaces f or Wi ld l i f e and Plant

Species t o Survi ve.


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What We Know About Green Roof

Benef i ts

Excel l ent St orm Wat er Capt ure and Fi l t r at ion

Reduce Heat ing and Cooli ng Cost s

Reduce Local Heat Island Ef f ect

Ext end t he Li f e Expect ancy of Wat erpr oofi ng

Imp rove Prope rt y Values

Increase Self -Report of Sat isf act ion People Feel Bet t er

Urban Farm ing is Successf ul


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What We Know About Green Roof

Mechanics

Tray System Installations Not as Robust as ConventionalGreen Roof Syst em s

Expanded Shale/ Calcined Clay-Based Medium Has a High

Em bod im ent Energy Value Up t o 1, 300% Higher ThanPumice-Based Medium

Sub-Surf ace Dri p Irr igat ion Provides t he Most Ef f ici entWat er Dist r ib ut ion

Plant Palet t e Expands in Dir ect Relat ion t o Media Dept h


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Expanded Shale/ Calcined Clay-Based MediumHas a High Em bodi m ent Ener gy Value Up t o

1, 300% Higher Than Pum ice-Based Medium


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Tray Syst em inst al l at ions Not as Robust asConvent ional Green Roof syst em s

Trays Can Pul l Mem br ane and Cre at e Leaks

Black Edges Absorb Heat and Can Cause Plant Stress

The Gri d Wil l Nat ural ly Reassert It self Over Time

Europe Only Inst all s Appr oxim at ely 3-4% of Green Roof s Wit hTrays Versus 30-40% 10 Years Ago.

Doubl e t he Cost of Non-Tray Syst em s


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Nat urall y Occur ri ng No Mini ng or Processing Requi red

Holds and Releases Wat er More Ef f ici ent ly Than Man-Made Prod uct s

High Albedo Coeff ient Helps t o Keep t he Roof Cooler byRef lect ing t he Sun

Low er Therm al Conduct ivi t y Helps Ret ain Heat inWinter


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Sub-Sur f ace Dr ip Ir r igat ion Provides t he MostEf f ic ient Wat er Dist r ibut ion


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Sub-Sur f ace Dr ip Ir r igat ion Provides t he MostEf f ic ient Wat er Dist r ibut ion

Provides Consist ent Moist ure

Eli m inat es Wat er Wast e w it h Sur f ace Evaporat ion

Creat es Wet t ed Area Up t o 45% Larger Than A Sur f aceDrip System

Doesn t Wat er Sur f ace Weed Seed


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Plant Palet t e Expands in Dir ect Relat ion t oMedi a Dept h

10. 2 cm Dept h

Sedum Most Variet ies

Ir i sh Moss Sagina Subulat a Al l i um Wi ld On ion

Geum Tr i f lo rum Prai r ie Smoke

Dalea Purpurea Purple Pra ir ie Clover

Sporobolus Het erro lepis Prair ie Dropseed


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15. 2 cm Dept h

Sedum Most Variet ies

Al l i um Wi ld On ion Ir i sh Moss Sagina Subulat a

Geum Tr i f lo rum Prai r ie Smoke

Dalea Purpurea Purple Pra ir ie Clover

Sporobolus Het erro lepis Prair ie Dropseed

Bout e loua Cur t ipendu la Side Oats Gramma

Koele r ia Macran tha - June Grass


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20. 3 30.5 cm Dept h

All Sedum Variet ies

All Perenni als Most Grasses

Some Compact Shrubs and Evergreens

Some Ornament al Trees w it h Wint er Prot ect ion

Cont inus Coggygr i a Smoke Tree

Kor ean Maple

Japanese Maple


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Cur rent Research Needs

Underst anding Wat erp roof ing Longevit y in Gr een RoofAppl ications

Bet t er Underst anding of t he Ret urn on Invest m ent (ROI)

Role of Aut omat ic Irr igat ion in Long-Term Survi val andPlant Healt h

Impact of Green Roof s on Populat ion Healt h and Heali ng

Fact ors That Increase Biodi versit y


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Key Resources

Green Roof s f or Healt hy Cit ies (GRHC)

Int ernat ional Green Roof Associat ion (IGRA)

World Green Roof Congress

Realgreenroofs.com

Green Roof Manual

Green Roof Plant s


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Green Roof Manual


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Green Roof Plant s


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QuestionsQuestions

greenroofshelsinki presentation 1.0 - october 10, 2011

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