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8/9/2019 Persuading Your Client - A Rapid Cost Benefit for Green Roof Technology
1/15
Hyder Consulting (UK) Ltd
Persuading your ClientA rapid cost benefit for Green Roof Technology
Presented by: Liam Foster
Sheffield Green Roof Forum
22nd November 2007
PREVIOUSLY PRESENTED TO
Green Roofs 2007 Conference
Opportunities for Architects in
the Green Roof Industry
8/9/2019 Persuading Your Client - A Rapid Cost Benefit for Green Roof Technology
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Hyder Consulting (UK) Ltd
Persuading your client
Focussing on the opportunities for surface water management:
Hydrology
Surface Water Management
What does a Green (Living) Roof do to a structure ?
Why are costs seen as prohibitive ?
What are the financial benefits ?
What about added value for your client ?
Topics for discussion
8/9/2019 Persuading Your Client - A Rapid Cost Benefit for Green Roof Technology
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Hyder Consulting (UK) Ltd
Persuading your client
8/9/2019 Persuading Your Client - A Rapid Cost Benefit for Green Roof Technology
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Hyder Consulting (UK) Ltd
Persuading your client
Conventional hard engineering Collect and remove from area
SUDS The Management Train principle Replicate the natural environment
Ways to manage surface water
Green roofs a good way to get SUDS off the groundBrian DArcy (SEPA)
Green Roofs mimic nature
Storing water volume within layers Delaying water run-off affecting time of concentration Losing water through evaporation
From: www.ciria.org.uk
8/9/2019 Persuading Your Client - A Rapid Cost Benefit for Green Roof Technology
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Hyder Consulting (UK) Ltd
Persuading your client
Effect on Structure
But Less if included earlier in design process
Green roofs not suitable for all buildings Move away from inefficient buildings -
Part L Building Regs
Plainly speaking Represents some additional loading:
Foundations Columns
Additional roofing materials Construction
= Opportunity !
8/9/2019 Persuading Your Client - A Rapid Cost Benefit for Green Roof Technology
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Hyder Consulting (UK) Ltd
Persuading your client
Using Green Roofs can reduce need for below ground attenuation structures
Consider cost of building as a whole not individual segments
Encourages better management of fees
Increased opportunity to avoid cuts - value engineering
What does the client need to know ?
Increased focus on sustainability & environment
Structural costs can be offset by reductions in development charges/rates
Section 106 requirements
Developer infrastructure charges
8/9/2019 Persuading Your Client - A Rapid Cost Benefit for Green Roof Technology
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Hyder Consulting (UK) Ltd
Persuading your client
Local Issues
High groundwater table
City Centre Location
Geological conditions
River Rea Response - Flashy
Sustainable Eastside - Introduction
Thus traditional ground level
SUDS have limited use !
20 25 year redevelopment profile need for strategy
High percentage of impermeable area relatively low times of concentration
Capacity of existing network largely combined
Main network run to Minworth WwTW surcharged in 1 in 5 year event
Minworth WwTW - near capacity
8/9/2019 Persuading Your Client - A Rapid Cost Benefit for Green Roof Technology
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Hyder Consulting (UK) Ltd
Persuading your client
Green roofs can save money for:
Each developer
Birmingham
UK Plc
Identified that strategic solutions would be best with policy to guide
greening of developments
Sustainable Eastside - Findings
8/9/2019 Persuading Your Client - A Rapid Cost Benefit for Green Roof Technology
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Hyder Consulting (UK) Ltd
Persuading your client
Site Q Existing4.75 hasite
No Green Roof = 106m3of attenuation (1 in 30yr).
With green roof = 0m3of attenuation.
Sustainable Eastside Example Development (1)
Land Value c. 5 m/acreLand Area required = 106 m
Approximate construction cost = 106k (~1000 per m)
Approximate land value = 1235.83 per m = 123,583
TOTAL SAVING = 229,583 (uncontaminated ground conditions)
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Hyder Consulting (UK) Ltd
Persuading your client
Based on Site Q Total roof area ~ 1.8 ha
Overall building construction ~ 1000 per m Value ~ 18m
Approximate structural cost ~ 40% of Value
Value ~ 7.2m
Approximate structural cost of roof ~ 7.5% of structural costs
Value ~ 540,000
Increase in roof cost to accommodate a Green Roof (extensive)
conservatively15% higher build cost for foundations & structures 81,000
Cost Benefit = 230k - 81k =149k saving
Sustainable Eastside Example Development (2)
INTERESTED ?
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Hyder Consulting (UK) Ltd
Persuading your client
Sustainable Eastside - Benefits
Drainage & network benefits Private Developer
SAVES MONEY
Reduce unnecessary below ground attenuation
Reduce need for external pipe works
Nicer living/working environment easier to sell
Drainage & network benefits Public
Alleviate overloaded sewerage system
Avoid heavy investment in artificial drainage systems. Underpin long-term development programme for Eastside
Reduce future energy costs & carbon emissions
Improve water quality in the River Rea.
Winning of other benefits
Improve central Birmingham biodiversity regime
Improve micro-climate
Assist meeting current sustainability criteria
Photo: Craig Churchill
Photo: Carlisle 2005 (BBC News)
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Hyder Consulting (UK) Ltd
Persuading your client
Planning, Legislation, building requirements, etc
Emerging Requirements
Climate Change & Carbon Emissions
Code for Sustainable Homes DCLG (2006) The London Plan Energy Strategy Zero Carbon Buildings (2006)
The Building Regulations (Part L) BRE (2006) UK Sus. Devt Strategy: Securing the Future (2005)
Flooding European Floods Directive (~October 2007) Tougher requirements to limit surface water from development sites
PPS25 Development & Flood Risk DCLG (2006) UK Government - Making Space for Water (on-going) Designing For Exceedance (CIRIA, 2006)
Water Environment European Water Framework Directive (2000)
8/9/2019 Persuading Your Client - A Rapid Cost Benefit for Green Roof Technology
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Hyder Consulting (UK) Ltd
Persuading your client
Developer (for disposal)
Tangible
Lower build costs Reuse of materials onsite
Intangible
Green credentials BREEAM etc
Marketing
Quicker on-sale
Additional benefits
Developer (for retention/leasing)
Tangible
Lower build costs
Building insulation & efficiency (energy)
Building management (yields & voids)
Increased roof life (membrane)
Intangible
Ongoing green credentials
Inhabitants happier Amenity Space
Public Benefits
Reductions in Urban Heat Island
Improved Air Quality
Reduce flooding potential
Cleaner water in rivers Aesthetic benefits community well-being
ESSENTIALLY GREEN ROOFS AND SUDS
USEFUL CLIMATE CHANGE ADAPTATIONTOOL:
STORMWATER RUN-OFF REDUCTION COOLING OF BUILDINGS LESS ENERGY
BIODIVERSITY
8/9/2019 Persuading Your Client - A Rapid Cost Benefit for Green Roof Technology
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Hyder Consulting (UK) Ltd
Persuading your client
Encourage uptake early in design promote and keep the concept
Lump all costs and savings together - Produces different picture
Whole Life costing not accurately reflecting greening potential
Changing policy & move to sustainability = OPPORTUNITY
Final Thoughts
8/9/2019 Persuading Your Client - A Rapid Cost Benefit for Green Roof Technology
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Hyder Consulting (UK) Ltd
Hyder are celebrating our 150th anniversary in2007. Please visit our website to see our iconic
projects - www.hyderconsulting150.com
Thank you
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