2002 - Green Roofs Infrastructure - Lessons Learned From Toronto's Demonstration Project

8/3/2019 2002 - Green Roofs Infrastructure - Lessons Learned From Toronto's Demonstration Project

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Green Roofs In f ras t ruc t ure:

Lessons Learned f rom Toront o s

Dem onst ra t ion Pro jec t

Nor t h Am er ic an Urban Heat

Is land Sum m i t

May 3, 2002 - Toront o

Steven Peck, PresidentCardinal Group Inc.

Executive DirectorGreen Roofs for Healthy [email protected](416) 971 4494


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Overview

Introduction to Green Roof Infrastructure Public-Private Benefits/Market Drivers

Toronto Demonstration Project

Lessons Learned


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What is Green Roof

In f ras t ruc tu re?

Used since ancient Egyptians /Romans On top of a human-made structure

Can be below, at or above grade Part of roofing system - not planter boxes

Two Major Types - Extensive or Intensive(Variations)

May be accessible or not


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Princ ipal Green RoofPr inc ipal Green Roof

Inf ras t ruc t u re Com ponent sInf ras t ruc t u re Com ponent s

Source: NRC, Institute for Research in ConstructionSource: NRC, Institute for Research in Construction

vapourvapour control layercontrol layer

thermal insulationthermal insulation

support panelsupport panelWater/root proof membraneWater/root proof membrane

drainage layerdrainage layerfilter membranefilter membrane

Light weight growing mediumLight weight growing medium

vegetationvegetation

structural supportstructural support


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Green Roof In f rast ruc t ure

Syst em Com ponent s

Plants (low, hardy alpine and dryland species- depends on climate and growing mediadepth/roof loading capacity)

Growing media (lightweight mineral based -

sand, gravel, crush brick, organic matter &some soil)Landscape or filter cloth (contains the roots &

growing medium and allows water runoff)

Drainage Layer (can be gravel, polystyreneand may be formed with reservoirs)

Root repellant membrane (inertchemical or metallic lining)


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In t ensive Syst em s

Main Features:

high maintenance heavier weight

deeper growingmedium

more plant varieties

often accessible topublic or occupants

more investment

Intensive and Accessible, Cannon

Street Railway Station, London


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Ex t ens ive Syst em

Main Features:

low maintenance

light weight

shallow growing medium

herbs, grasses, sedums,wildflowers

harsher conditions

less investment Up to 30 degrees slope

Extensive Green Roof


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Merc handise Lof t s , Toront o

Ex t ens ive & Ac c ess ib le


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Mul t ip le Pub l ic & Pr ivat e

Benef i t s /Mark et Dr ivers

Public Benefits - Typically City Wide orAggregate

Private Benefits - Building/Site Specific

Nature of Benefits Dependent on: Size of Building and Green Roof Type

Regional Climates

Scale and Scope of Built Form

Types of Urban Environmental

Challenges


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Reduc e UHI = Cleaner Ai r & > Energy Use


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4. Stormwater Management (summer/winter)5. Water Filtration & Quality Improvements

(temperature, turbidity and pollutants)

6. Aesthetic Improvements/Improve Public Spaces

7. Health Benefits (Hospitals)

8. Improved Safety (Safe spaces for seniors)

More Publ ic Benef i t s o f More Pub l ic Benef i t s o f More Pub l ic Benef i t s o f More Pub l ic Benef i t s o f

Green Roof In f ras t ruc t ureGreen Roof In f ras t ruc t ureGreen Roof In f ras t ruc t ureGreen Roof In f ras t ruc t ure


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9. Recreation/Amenity Space

10. Job Creation

(Direct Installation & Maintenance - New Uses ofWasted Space)

11. Preservation of Habitat & Biodiversity (Flora

and Fauna)

Sto rmwa te r S to rmwa te r S to rmwa te r St o rm w at e r re t ent ion Da t a - Ot t aw are t ent ion Dat a - Ot t aw are t ent ion Dat a - Ot t aw are t ent ion Dat a - Ot t aw a

Researc h Sit e - NRC, IRCResea rc h Sit e - NRC, IRCResearc h Sit e - NRC, IRCResea rc h Sit e - NRC, IRC

0

10

20

30

40

10/5/01

15:00

10/5/01

18:00

10/5/01

21:00

10/6/01

0:00

10/6/01

3:00

10/6/01

6:00

10/6/01

9:00

10/6/01

12:00

10/6/01

15:00

Date / Time

CulmulativeRain

/Runoff(mm


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9. Recreation/Amenity Space10. Job Creation

(Direct Installation & Maintenance - New Uses of

Wasted Space)

11. Preservation of Habitat & Biodiversity (Flora

and Fauna)

More Publ ic Benef i t s o f More Pub l ic Benef i t s o f More Pub l ic Benef i t s o f More Pub l ic Benef i t s o f

Green Roof In f ras t ruc t ureGreen Roof In f ras t ruc t ureGreen Roof In f ras t ruc t ureGreen Roof In f ras t ruc t ure


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Roundhouse Park , Toront o

Sem i Ex t ensive, Ac c ess ible


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Fai rm ont Hot e l , Vanc ouver

Sem i Ex t ensive , Food/Rec reat ion


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Pr iva t e Benef i t sPr ivat e Benef i t sPr iva t e Benef i t sPr ivat e Benef i t so f Green Roof In f ras t ruc t ureof Green Roof In f ras t ruc t ureof Green Roof In f ras t ruc t ureof Green Roof In f ras t ruc t ure

1. Reduced Heating & Cooling Costs (New

Construction reduce size of HVAC Systems)

Cooling benefit appears to be more important than

heating

Up to 25% reduction in smaller buildings (many

factors involved, i.e., % roof area to total envelop)

2. Membrane Life Extension -European evidence suggests x2 ormore?


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Pr iva t e Benef i t sPr ivat e Benef i t sPr iva t e Benef i t sPr ivat e Benef i t so f Green Roof In f ras t ruc t ureof Green Roof In f ras t ruc t ureof Green Roof In f ras t ruc t ureof Green Roof In f ras t ruc t ure

3. Indirect Economic Benefits -

Sound Insulation - near airports, highways..

4. Increase Property Market Value

Private Roofpark in condos

5. Value of the Spaces Lease space for Urban, Agricultural Production,

Outdoor Classrooms, Horticultural Therapy. Golf ???

6. Fire Retardation Needs to be investigated further


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Chal l enges t o Green Roof

In f rast ruc t u re Developm ent

1998 Greenbacks for Green Roofs study

Growing market segment in Europe due to publicincentives/investment for private installations.

Public benefits of green roofs are not incorporated

into market and do not impact on decision making Technical data limitations in quantifying benefits -

at the building and the city-scale.

Lack of awareness & no incentives


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Green Roofs for Heal t hy Ci t ies -

Members - see w w w .greenroo fs .c a

Established in 2000. Members include:

Flynn Roofing

Soprema

Garland Canada Sheridan Nurseries

Elevated Landscape Technologies

IRC Building Sciences M+S, Landscape Architects

GreenTech


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Green Roofs for Heal t hy Ci t ies

Pr imary Goal

To foster the development of a multi-

mil lion $ market for green roof

infrastructure in North America

Share resources to develop market and newbusiness opportunities.

Address technical &awareness issues.

Blend private benefits with public incentives

to generate market investment


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Green Roofs for Heal t hy Ci t ies-

Toront o Dem onst ra t ion Pro jec t

Project Partners:

National Research Councils Institute forResearch in Construction

Environment Canada,

The City of Toronto, TAF, and

Member companies of Green Roofs for

Healthy Cities


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Toront o Dem onst ra t ion Pro jec t

Gr een Roofs fo r Heal t hy Ci t ies -

Toront o Dem onst r a t ion Pro jec t

Project Main Objectives:

Generate technical data for site and city-widebenefits to support green roof incentives (Portland)

Increase public/professional awareness

Engage government officials Project Main Components:

Toronto City Hall - fully complete

Eastview Community Centre - complete this spring Modeling of urban heat island

benefits of green roofs-Dr. Brad Bass, Environment Canada.


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Toront o Ci t y Hal l s Unique

Dem onst ra t ion Pro jec t Si t eMain Features:

Goals - public awareness

and technical performance Soprema & Garland GreenRoof Systems Eight different plots of

various depths to illustratemultiple features/applications170 species of plants: Two semi extensive

Two extensive Butterfly & B.O. Savannah Two food production


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Toront o Ci t y Hal l Si t e Plan

P1

P2GARLAND

MECHANICAL

ROOM

HOSE BIB

P3SOPREMA

P4

5 15

12

12

22

~110

12

25

25

34 - 2

~77

42 - 7


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Toront o Ci t y Hal l

Dem onst ra t ion Pro jec t Si t e

Main ResearchFeatures:

Temperature profileHeat flowSoil moisture contentRelative humiditySolar radiationCO2 ConcentrationsFood productionPlant survivability


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EASTVIEW COMMUNITY CENTRE

DEMONSTRATION PROJ ECT SITE

Main Features:

Extensive green roof on localgymnasium using SopremasSopranature& GarlandsGreenshieldSystems

Inaccessible, limited extraloading capacity 20lbs/sfMaximum market capabilityResearch on: energy efficiency

gains, plant survivability,membrane durability, CO2 FluxStormwater quality&quantity

planned


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EASTVIEW COMMUNITY CENTRE

DEMONSTRATION PROJ ECT SITE

Soprema

Garland

80

60

25

HVAC

HVAC

x x x

x x xG1 G2 G3

S1 S2 S3

xReference


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Lessons Learned

Green Roofs Can Tap Multiple drivers - air

quality, energy efficiency, stormwatermanagement, recreational space in cities.Need data to make case for public incentives

to help stimulate private investment in greenroof infrastructure.Public investment case hinges on air quality,

energy efficiency and stormwaterEngage range of government officials in

examination of barriers/andbenefits research and policy

development.


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Lessons Learned

Must replicate research in other urban areas

in North America to create a green roofindustry and position cities to deal withmultiple future challenges.

Green roofs not for all buildings

Need combination of complimentary

mitigation strategies to reduce heat islandNeed to take full advantage of roof space

for multiple economic/social/

environmental benefits


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AWARENESS BUILDING

Technical information available on-line:

www.greenroofs.ca

Publish Green Roof Infrastructure Monitor

Free Journal - To subscribe send e-mail [email protected]

Guided Tour Saturday 9:00 am - Meet at

Peace Garden, Nathan Philips Square infront of City Hall - 100 Queen Street West

2002 - Green Roofs Infrastructure - Lessons Learned From Toronto's Demonstration Project

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