copyright © encraft ltd 2014 t: 01926 312 159 | encraft passivhaus conference #epc14
TRANSCRIPT
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Copyright © Encraft Ltd 2014T: 01926 312 159 | www.encraft.co.uk
Encraft Passivhaus Conference#epc14
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Copyright © Encraft Ltd 2014T: 01926 312 159 | www.encraft.co.uk
Welcome
• Venue Logistics
• Twitter #epc14
• Supporters & Sponsors
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Copyright © Encraft Ltd 2014T: 01926 312 159 | www.encraft.co.uk
Introduction to Passivhaus and Certification
Kym MeadPassivhaus Trust
30/05/2014
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Kym MeadAssociate Director, Passivhaus Trust
May 2014
Passivhaus Trust 5 Baldwin Terrace, London N1 7RU Tel: 0207 704 3502Email: [email protected] Web: www.passivhaustrust.org.uk
Passivhaus Introduction
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1. The Passivhaus Trust
2. What is Passivhaus?
3. Passivhaus uptake in the UK
4. Why Passivhaus?
5. Passivhaus Certification
Passivhaus
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• Founded in 2010 by the AECB to promote UK uptake of Passivhaus
• Non profit organisation with 250+ Members
• Partnering agreements with Strathclyde University and BRE
• Provides research on technical issues
• Working Groups
• Technical Panel
• UK Affiliate of iPHA
UK Passivhaus Trust
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UK Passivhaus TrustGovernance Structure
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1. The Passivhaus Trust
2. What is Passivhaus?
3. Passivhaus uptake in the UK
4. Why Passivhaus?
5. Passivhaus Certification
Passivhaus
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Underhill – Seymour-Smith Architects.
PassivhausWhat is it?
… Passivhaus is the leading international design standard for low energy, comfortable, high quality, affordable buildings.
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Passivhaus - Origins
“I was working as a physicist. I read that the construction industry had experimented with adding insulation to new buildings and that energy consumption had failed to reduce.
This offended me – it was counter to the basic laws of physics. I knew that they must be doing something wrong. So I made it my mission to find out what, and to establish what was needed to do it right”
- Wolfgang Feist
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•Primarily a low-energy performance standard for buildings
but also addresses
•Comfort
•Indoor air quality
PassivhausWhat is it?… in simple terms
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•Super- insulated
•minimise thermal bridges
•Very low air-leakage
•Mechanically ventilated (with heat recovery)
•Passive solar with solar shading
PassivhausWhat is it?… in simple terms
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PassivhausWhat is it?… Houses, apartments …
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Nestwerk residential building; photograph: Reiter & Rentzsch Architects.
Hanssen-Höppener Passive House; photographs: Rongen Architekten
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PassivhausWhat is it?… Schools, Kindergarten, Offices …
Riedberg Passive House School, Frankfurt (Architeckten 4a)
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Lengdorf nursery school, Germany (AB Vallentin)
Canolfan Hyddgen in Machynlleth, WalesJPW Construction
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RefurbishmentThe Passivhaus standard is not confined to new dwellings
“Quality-Approved Energy Retrofit with Passive House Components”
The goal was to create a standard for an economically and ecologically optimal energy retrofit, for old buildings that cannot achieve Passive House Standard with reasonable effort. (PHI)
Lena Gardens Grove Cottage
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•Space heat demand of < 15 kWh/m2.yr (25kWh/m2.yr for retrofit)- How much energy is needed to heat the building
•Pressure test result< 0.6 ach @ 50 Pa (<1 ach for retrofit)- How much air leaks through the fabric of the building
•Primary energy < 120 kWh/m2.yr- How much energy is needed to power all of the activities within the building (heating, hot water, lighting, cooking, appliances, active cooling)
•Frequency of overheating in summer < 10%How many times the temperature within the building exceeds 25C
PassivhausWhat does it mean?… Design and certification criteria
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Passivhausalongside other UK standards
Sustainable Construction
BREEAM CSH
Residential and non-domestic
PHPP
Non-domestic &Multi-residential Residential
SBEM SAP
Energy performance and comfort
standard
Passivhaus
Environmental Assessment Method
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1. The Passivhaus Trust
2. What is Passivhaus?
3. Passivhaus uptake in the UK
4. Why Passivhaus?
5. Passivhaus Certification
Passivhaus
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Around 30,000 Passivhaus projects have been completed world-wide, mostly in Germany and Austria.
The Passivhaus Standard is now the leading international low-energy standard.
The Passivhaus is a building concept that can be adopted by anyone!
Weber pre-fabricated timber frame Passivhaus, Germany (photograph KP ArCreation)
EU Passivhaus History
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Images: Passihaus Institut, JPW Construction, Green Building Company, Bere architects Simmonds.Mills
1991
1996
2010
UK 200
9
Passivhaus in the UK- We started quite late
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The First Certified Passivhaus Domestic Project in the UK
Y-Foel, Machynlleth, WalesJPW Construction
Completed: April 2009
Certification: April 2009
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The First Certified Passivhaus Non-domestic Project in the UK
Canolfan Hyddgen, Machynlleth, WalesJPW Construction
Completed: Jan 2009
Certification: July 2009
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The First Certified Passivhaus Domestic Project in England
Underhill House, Moreton-in-MarshHelen Seymour-Smith Architects
Completed: August 2010
Certification: January 2010
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The First Certified Education Building in the United Kingdom
Hadlow College, KentEurobuild
Completed: February 2010
Certification: March 2010
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The First Certified Community Centre in the United Kingdom
Centre for Disability Studies, EssexSimmonds Mills Architects
Completed: February 2010
Certification: April 2010
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The First Certified Cavity-Wall Passivhaus in the UK
Denby Dale, West YorkshireGreen Building Store
Completed: May 2010
Certification: April 2010
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The First Zero-Carbon/ Code 6 Passivhaus in the UK
Larch House, Ebbw Vale, Walesbere:architects
Completed: July 2010
Certification: ?? 2010
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UK Passivhaus 2010
Top: (Left to right) Underhill House, Centre for Disability Studies Essex, Hadlow College
Bottom: (Left to right) Lime House, Larch House, Denby Dale
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18 developments completed and certified
UK Passivhaus July 2011
Key:Blue pins - certifiedGreen pins – planned or under construction
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UK Passivhaus 2011
Top: (Left to right) Montgomery School, Oakmeadow School, Bushbury Hill School, Sampson Close
Middle: (Left to right) Interserve Office, Dormont Estate, Viking House, Wimbish
Bottom: (Left to right) Cae Gleision, Totnes Retrofit, Mayville Community Centre, Knight’s Place
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We now have about 100 units completed or about to be completed
UK Passivhaus July 2012
Key:Blue pins - certified
Green pins – planned or under construction
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Key:Blue pins - certifiedGreen pins – planned / under construction
In the UK:
• 50 Certified Projects completed, more underway
• About 150 dwellings, 6 sites of 15-25 units
• First big housing projects underway for 40-60 units
• And 15 certified non-domestic buildings
UK Passivhaus March 2013
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In the UK:
• >250 certified buildings completed
• >150 certified dwellings on sites of >10 units
• >100 sites either completed or underway
• almost 1000 units either completed or underway, including one site of 400 homes
UK Passivhaus March 2014
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1. The Passivhaus Trust
2. What is Passivhaus?
3. Passivhaus uptake in the UK
4. Why Passivhaus?
5. Passivhaus Certification
Passivhaus
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1. Better than requirements for Part L 2013
2. Provides a quality assured process as proposed under Part L 2013 compliance requirements
3. Helps you manage risks through an established and certified supply chain
4. Lets you give certainty to clients and/or purchasers
Passivhaus benefitsMeet forthcoming Part L requirements
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PH measured performance UK• Canolfan Hyddgen monitored data
– 80 kWh/m²/yr primary energy demand
– 14.8 kWh/m²/yr heating demand (£130/yr gas bill)
– temperatures never below 20°C or over 26°C
– achieved for £1784/m²
• Y Foel monitored data
– 105 kWh/m²/yr primary energy demand
– 14.97 kWh/m²/yr heating demand
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Comfort & health
Comfortable - in both winter and summer
“From the very first day we have felt comfortable in the house, as if wearing a good jacket which is the just the right size and comfortable.”Wilma Mohr, Passive House resident in
Darmstadt since 1991
The Hanssen-Höppener Passive House (Rongen Architekten)
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PHI image above from Passipedia
Good indoor air qualityComfort and health: consistent air quality
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Construction Methods:
Timber construction
Solid masonary, external
insulation
Mixed construction:concrete &
timber cladding
Solidmonolithic
Insulated concrete formwork
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Underhill House: Seymour-Smith Architects
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Plummerswood, GAIA Architects
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Why Passivhaus?...why not!
• Meets part L requirements• Improved comfort and IAQ• Delivers as designed• Any construction type• Can be achieve with both high/modest budgets
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1. The Passivhaus Trust
2. What is Passivhaus?
3. Passivhaus uptake in the UK
4. Why Passivhaus?
5. Passivhaus Certification
Passivhaus
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Passivhaus qualityQuality assured process with Certification for:
Buildings - Through UK based certifiers
Products / Components- Through Passive House Institute- Is a demonstration of performance but not
required (except for MVHR systems)
Designers / Consultants- Through CEPH courses - List of CEPH designers / consultants on the
PH Trust website
Tradesmen / Installers- Through Certified Tradesman courses
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Passivhaus Certification
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Thank you
For more informationwww.passivhaustrust.org.uk
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Copyright © Encraft Ltd 2014T: 01926 312 159 | www.encraft.co.uk
New build Passivhaus schemes in Camden
Andrew McDermottCamden Borough Council
30/05/2014
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New Build Passivhaus in Camden
Andrew McDermott, Regeneration and Development Team Leader, L.B. Camden
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Council housing in Camden• Diverse characteristics – stretches
north from Covent Garden To Hampstead & west from King’s Cross to Kilburn
• 34,000 Council owned properties - 9,000 leasehold
• Very high land values – average flat price is >£700k, terraced houses £>1.5m
• Pockets of deprivation - 44% of LSOAs remain in the bottom 30%
• Provision gap for middle income groups
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Why is Camden developing?
• Need to invest in new and existing housing identified
• Local politics very ‘pro’ council as landlord
• Can create high levels of council rented housing – around 50% of new developments’ GIA
• Retains land in Council ownership• Much lower transaction costs
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Development constraints
• Most sites require demolition and greatly increased density to be viable
• Complex urban environments – overlooking, sunlight and daylight, need to re-provide amenities and employment on many sites
• Challenging planning policy from both Camden and GLA –on space, amenity and sustainability
• Community politics can sometimes be difficult to manage
Alexandra Road Estate, Camden Architects 1980
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Sustainability challenges
• Dense sites with few opportunities for renewables
• Priority to create ‘lean’ buildings, but further emphasis on linking to wider energy networks and CHP – can be costly to build and maintain
• Fuel prices rising much faster than incomes
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Camden’s approach
• Master-planning and design to a high standard
• Architects appointed to individual schemes in competition
• Architects encouraged to innovate• Building design well advanced before
tendering• Developments pitched at private
markets• Tenanted dwellings are similar standard
to private• Emphasis on long-term build quality
and maintenance
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Why Passivhaus?• Camden Planning policy promotes passive design principles – fabric
first, low energy use• Commitment to tackling fuel poverty• Benefits for residents’ health and comfort• Aim to reduce maintenance requirements
- low heat requirements so less plant on major sites- careful detailing and building gives better performance
with fewer remedial repairs• Lack of opportunities for significant renewables to achieve carbon offset• Important for authority to lead the way
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Business Case(?)
• Additional costs difficult to assess in a rising market with limited examples
• Cost drivers are:• material & labour costs• design costs• Contractor’s risk premium• Loss of saleable area where envelope
maximised• Savings: reduced requirements for energy centres,
lower long term maintenance• So may be unattractive for commercial developers at
this time• But is attractive for clients/developers who will
manage site in the long term
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Chester BalmoreDeveloper: L.B. Camden
Architect: Rick Mather
AssociatesMain Consultant: McBain Cooper
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Chester Balmore
• 53 homes – 23 Council rented, 4 shared ownership and 26 private sale
• GP surgery and 3 Retail units• 95% sale units have sold before
completion• Completion due mid-June• All dwellings successfully passed air-
tightness tests - full certification expected shortly
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Chester Balmore
• Difficult site – very compact, dense build
• Changes of level across site• Overlooking and conservation
area challenges at Planning stage
• Complex built form is challenging for designers
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Chester Balmore
• Shows Passivhaus compatible with complex forms - doesn’t need to be ‘box-like’
• Has some sales cache with a range of demographics
But• No evidence of increased
sales values• Fuel bill savings accrue to
the end user, not developer
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Agar Grove
Developer: L.B. CamdenArchitect: Hawkins Brown/Mae/Grant AssociatesMain Consultants: EC Harriss
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Agar Grove
• 345 new passivhaus homes • Remodelling existing tower -
BREEAM Excellent• Range of heights – 5 – 18 storeys• Largest consented passivhaus
scheme in the UK• Starts on site November 2014
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Agar Grove
• Comprehensive estate remodelling
• Passivhaus well integrated with other design drivers – eg maximising density, inset balconies, orientation
• Few compromises on built form to achieve Passivhaus
• Difficult, but do-able
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Conclusion• As we build more passivhaus schemes
in the UK costs and perception of risk will reduce
• Passivhaus adoption for large, urban developments is challenging but can become the norm
• Statutory requirements will continue to be more demanding and the performance gap from ‘minimum’ to Passivhaus may reduce
• Despite site constraints, Passivhaus has a good fit for urban local authorities and housing developers with a long term interest
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Copyright © Encraft Ltd 2014T: 01926 312 159 | www.encraft.co.uk
Wilmcote House EnerPHit
Steve GrovesPortsmouth City Council
30/05/2014
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www.portsmouth.gov.uk
Wilmcote House EnerPHitEncraft Passivhaus Conference
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www.portsmouth.gov.uk74
Agenda
• Portsmouth City Council (PCC) Housing Stock• Wilmcote House Details • Wilmcote House Demand• Factors Against Demolition• Wilmcote House Project• Research Evaluation• Why EnerPHit?
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www.portsmouth.gov.uk
PCC Housing Stock
• Stock size – 15,000 HRA & 2,000 leaseholders
• Asset type – residential & commercial assets, traditional & non-traditional
• Age of stock – predominantly post war (1950 – 1970)
• High rise blocks – 40 high rise blocks (6 storeys and above)
• Repairs & Maintenance budgets– £46 million annual repairs & maintenance budget (2014/2015)
• Asset management strategy – demand led, Self Financing Settlement & HRA 30 year business plan
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www.portsmouth.gov.uk
Wilmcote House DetailsConstruction• Large Bison REEMA concrete
panel construction• 11 storeys & built 1968• Average SAP 55 • 100 x Three bedroom
maisonettes• 7 x One bedroom flats• Area Housing Office located on
ground floor• Previous major schemes &
estate regeneration early 1990s
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www.portsmouth.gov.uk
Wilmcote House Demands
• Electric heating cost excessive for residents– Fuel poverty– Somerstown deprived area of city
• Maintenance costs significant– Condensation reported by a third of residents– Window repairs reported by 80% of residents over a 2 year period– Water ingress issues to properties and communal stairwells
• Windows and roof at end of serviceable life• Concrete repairs required to maintain life of structure• Decorations to communal & external areas failing• Security to communal areas ineffective• Area Housing Office relocating to new community hub
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www.portsmouth.gov.uk
Factors Against Demolition • Demolition costs• Disturbance allowances & home loss costs• Rebuilding costs including fees• Rent loss during decant and rebuilding phases• Site footprint physical constraints and planning
requirements within area• Decant impact on PCC waiting lists & demand for three
bedroom properties• Demolition impact on residents and community • Financial cost appraisal supported refurbishment • Asset management strategy impact on other high rise
and non traditional buildings over next 30 years
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www.portsmouth.gov.uk
Wilmcote House ProjectProject Overview• Insulate external envelope with
cladding EWI• Replace roof and insulate• Triple glazed window
replacement• New hot water cylinders &
install electric showers• Mechanical Ventilation Heat
Recovery (MVHR) units• Extend living areas and create
sun room • Enclose communal walkway,
create additional entrance • Introduce restrictive access
doors• Convert office into 4 additional
flats• Structural concrete repairs &
decorations to external/ communal areas
• **Replace electric heating**
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www.portsmouth.gov.uk
Research Evaluation
• Research partners– University of Southampton – Portsmouth University– London School of Economics– BRE – EuroPHit– PCC Departments
• Consultants/ Contractors– ECD Architects – Keegans– Keepmoat
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www.portsmouth.gov.uk
Research Evaluation • Energy benefits
– Initial research indicates more than half the properties fail to achieve the recommended indoor temperatures
– Reassess temperatures, demand for electricity & costs post scheme
• Health benefits– Health of residents before, during and after scheme
• Social benefits– Impact on residents lives before, during and after the project– Use of building and controls by residents post work
• Asset benefits– Impact on PCC asset management strategy for other high rise and non-
traditional properties– Costs of work (direct & indirect) versus alternative asset management
strategy options such as demolition or traditional schemes
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www.portsmouth.gov.uk
Why EnerPHit ?
• Residents improved living environment– Fuel poverty & cost of heating – Health and social benefits– Effective management of property systems & controls
• Informing asset management strategy – Future proof against government energy standards for housing (U
Values & SAP Ratings)– Future proof energy prices with strategy to insulate & reduce demand
for energy – Reduce D2D maintenance demand in non-traditional stock – Learning from ‘actual’ complex large exemplar scheme informing
strategy of all 17,000 PCC housing stock & not just Wilmcote House
• Priority is building performance versus certification
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www.portsmouth.gov.uk
Thank You
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