bere:architects 73 Poets Road London N5 2SH T +44(0)20 7359 4503 www.bere.co.uk CIH Manchester 2012 Ideas Exchange, Wed 13th June, 10.00 -10.45 Sustainability Theatre Is it possible to retrofit and build to Passivhaus standards affordably? Justin Bere of twitter: @jbere & @bere:architects | www.bere.co.uk PRESENTATION INCLUDES CONTENT FUNDED BY THE TECHNOLOGY STRATEGY BOARD’S BUILDING PERFORMANCE EVALUATION PROGRAMME http://goo.gl/ny5vG
Affordable Passivhaus Construction Learning lessons from advanced European timber construction Hotel Post Bezau - Kaufmann Zimmerei Camden Passivhaus - Bere Architects Lime House - Bere Architects Affordable Passivhaus Retrofit Case study of Mayville Community Centre, London c bere:architects 2012 Mayville Community Centre - Before Refurb Mayville Community Centre - During Refurb Mayville Community Centre - After Refurb Is it possible to retrofit and build to Passivhaus standards affordably?
Affordable Passivhaus Construction Learning lessons from advanced European timber construction Low Cost Low Carbon Locally Grown Great for the Local Economy Great for the Environment Perfect for Low Energy Building Reduced Imports for Long Term Security c bere:architects 2012 Hotel Post Bezau - Kaufmann Zimmerei Is it possible to retrofit and build to Passivhaus standards affordably?
Fast, Efficient, Cost Saving Techniques 300mm solid wood studs, screwed and glued - standard practice in Austrian factories High quality wood grown specifically for the demands of the Austrian construction industry Untreated wood - healthy to work with and live in - and easily re-used in the future Notice how the factory is beautifully designed by a leading Austrian passivhaus architect, with plentiful natural daylight and made from untreated wood in beautiful, natural colours, with soft fibre-lined walls for acoustics. It speaks of a love of craftsmanship. The company has been owned by the same family for three generations and is led first and c bere:architects 2012 foremost by craftsmen. Factory of Kaufmann Zimmerei, Reuthe Is it possible to retrofit and build to Passivhaus standards affordably?
Camden Passivhaus - Austrian Knowledge Transfer 2008-9 Matthias Kaufmann of Kaufmann Zimmerei worked for 18 months full time in our London design office. Timber frame designed, manufactured and installed without a knowledge gap, teaching us advanced timber framing techniques. c bere:architects 2012 Camden Passivhaus - knowledge transfer of advanced techniques Is it possible to retrofit and build to Passivhaus standards affordably?
Exploring Welsh Manufacturing Techniques In 2009 we needed a Welsh manufacturer to build our Building Research Establishment’s 2009 competition-winning design for the Welsh Passivhaus. Rob McLeod, Nick Tune (BRE) introduced us to Holbrook. They mainly produce 140mm thick stud walls for Premier Inns. We need to transform typical UK manufacturing techniques from 140mm nailed panels to the largest possible sections, glued and screwed with s/s screws. Welsh prototype, completed summer 2010 Notice the difference from the Kaufmann factory: artificial lighting, steel-framed building, metal sheeting, metal shelving, green chemically treated wood. We need a transformation of wood construction philosophy in the UK! We need to move from a primarily business-led industry, to an c bere:architects 2012 unambiguosly craftsman-led industry. 140mm thin nailed timber stud walls being produced at Holbrook, Brigend, 2009 Is it possible to retrofit and build to Passivhaus standards affordably?
Adapting Welsh Manufacturing Techniques The largest reasonably easily obtained Welsh softwood studs are 225mm wide. Using a core of 215mm Welsh timber studs, we were able to build up to the full Passivhaus requirements* However, 3 layers of construction inevitably adds cost compared to Austrian two-layers! 4 2 1 3 5 Larch House, completed 2010 1. 225mm untreated softwood stud wall with OSB board (inside face), Panelvent (outside face), containing mineral wool insulation. Larch House Passivhaus wall build-up using Austrian timber frame 2. Vapour control membrane techniques adapted to smaller UK material dimensions. 3. 100mm services zone containing wood fibre * The unusally large levels of insulation (eg 425mm in the walls) was a insulation precautionary requirement of the brief from BRE Wales, which required 4. ‘Eco-joists’ with pressed metal flanges us to use 10 year worst case weather data, a requirement subsequently 5. Outer layer of 100mm wood fibre insulation c bere:architects 2012 explained by the Passivhaus Institute as being unecessary and adding undue pressures upon the build-cost of the project. Is it possible to retrofit and build to Passivhaus standards affordably?
Reducing the Cost of Construction Timber framing can deliver a complete Passivhaus frame and roof for £17,000+vat (excluding supply of windows, but including the cost of installing windows & doors). c bere:architects 2012 Lime House - timber framed passivhaus, Ebbw Vale Is it possible to retrofit and build to Passivhaus standards affordably?
Reducing the Cost of Construction Timber framing can deliver a complete Passivhaus frame and roof for £17,000+vat (excluding supply of windows, but including the cost of installing windows & doors). ...a chance for low cost, community-self-build? (2 bed super low-energy passivhaus for under £100,00) c bere:architects 2012 Lime House - timber framed passivhaus, Ebbw Vale Is it possible to retrofit and build to Passivhaus standards affordably?
Lime House Construction Process Lime House Construction Process Assisted self-build cost breakdown analysis Assisted self-build cost breakdown analysis Assumes that things a self builder can do are not costed Assumes that things a self builder can do are not costed Choose site c bere:architects 2012 Running total Running total £0 £0 The Ebbw Vale site Is it possible to retrofit and build to Passivhaus standards affordably?
Lime House Construction Process Assisted self-build cost breakdown analysis Assumes that things a self builder can do are not costed Lay insulation £4,775 (Material supplied) £4,368 - 480mm Styrofoam £407 -Edge insulation c bere:architects 2012 Running total £6,064 Installing the ground slab insulation Is it possible to retrofit and build to Passivhaus standards affordably?
Lime House Construction Process Assisted self-build cost breakdown analysis Assumes that things a self builder can do are not costed Pour concrete slab £2,646 (Material supplied) -DPM and tanking £276 -Mesh reinforcement £496 -U bars & splice £205 -Shuttering to slab £168 -225mm thick concrete slab £935 -Thermalite blockwork £167 -Service ducts £400 c bere:architects 2012 Running total £8,711 Constructing the concrete slab Is it possible to retrofit and build to Passivhaus standards affordably?
Lime House Construction Process Assisted self-build cost breakdown analysis Assumes that things a self builder can do are not costed Timber frame constructed £17,662 (Fully installed) c bere:architects 2012 Running total £26,379 Installing the prefabricated timber frame walls Is it possible to retrofit and build to Passivhaus standards affordably?
Lime House Construction Process Assisted self-build cost breakdown analysis Assumes that things a self builder can do are not costed Complete superstructure £17,797 (Material supplied) -Roof covering £4,806 -Stairs £448 -External insulation £5,963 -Internal insulation £2,033 -Internal walls £2,209 -External render* £2,338 (larch cladding additional) c bere:architects 2012 Running total £44,170 Installing the exterior finishes Is it possible to retrofit and build to Passivhaus standards affordably?
Lime House Construction Process Assisted self-build cost breakdown analysis Assumes that things a self builder can do are not costed Windows & ext. doors fitted £8,828 (Fully installed) c bere:architects 2012 Running total £52,997 Sealing the airtight layer Is it possible to retrofit and build to Passivhaus standards affordably?
Lime House Construction Process Assisted self-build cost breakdown analysis Assumes that things a self builder can do are not costed Apply finishes £8,493 (Material supplied) -Wall finishes £4,061 -Floor finishes £2,672 -Ceiling finishes £949 -Internal doors £812 c bere:architects 2012 Running total £61,490 Completed stairwell Is it possible to retrofit and build to Passivhaus standards affordably?
Lime House Construction Process Assisted self-build cost breakdown analysis Assumes that things a self builder can do are not costed Plumbing fitted £7,450 (Fully installed) -Subcontractor’s fee including plumbing, sanitaryware and solar hot water heating c bere:architects 2012 Running total £68,940 Solar hot water tank and small boiler Is it possible to retrofit and build to Passivhaus standards affordably?
Lime House Construction Process Assisted self-build cost breakdown analysis Assumes that things a self builder can do are not costed M&E fitted £15,627 (Fully installed) -Ventilation £8,372 -Electrical installation £6,485 -Grid connection £770 c bere:architects 2012 Running total £84,567 Heat recovery ventilation system Is it possible to retrofit and build to Passivhaus standards affordably?
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