for CoREfabric first and refurbishment excellence:up-skilling to deliver the green deal andbeyondmay 2012a natural materia...
Hanley 2010
built on clay
a living community
an architectural diversity    developed over time
Small window area giveminimum solar gain                                           23 St Lukes Street                     ...
plan before             refurbishment55m2internalfloor area
heat loss through                                           before refurbishmentchimney stacks                            ...
energy performance                                                                    Pas s ivh au s Ene rp h it s tand ar...
the challenge...      St Luke street    St Luke street      existing energy   retrofit energy            use              ...
natural materials retrofit approachhealth                      non-toxic production /                            disposal ...
Passivhaus building standardhighly insulated & airtight fabricwall U-value = max. 0.15 W/(m²K)roofs = max. 0.15 W/(m²K)flo...
Passivhaus methodology retrofit60000        Existing heat demand of 23 St Lukes Street = 33,000 kWh/yr = 660 kWh/sqm/yr500...
typical variation in occupant use of energy
depth of insulation - design for it!             - front & rear elevations of             terrace usually shortest width  ...
continuous insulation & air-tight layer                        U-Value = 0.10        Internal wall                        ...
fabric first approach - walls                    service zone                    woodfibre insulation, fixed to           ...
avoiding thermal bridges - carefully detailed junctions                                            floor to wall          ...
eaves detail
windows in the wall - St Luke street
new extension walls
fabric first approach - walls
woodfibre insulation to party walls
monitoring moisture : internal wall insulationconstruction drying out     leaking gutter soaking wall
airtight detailingwhat is the airtight barrier?walls and roof: air-tight membranefully plastered walldamp proof membraneca...
heat recovery whole house ventilationfresh, warm, low energy airair supply will never be lower than 16.5℃due tohigh effici...
St Luke’s Street -completed retrofit
St Luke street - results, calculated and measured                            Exis ting H o u s e   R e tro fit H o u s e  ...
resident experience“We are delighted to have theopportunity to be involved with thisground breaking project. We feel it is...
what did we learn?• Whole house approach• Educated project team and committed contractor essential• Joint working opportun...
be boldwell wrapped upairtightwell ventilatedwhere next for Stoke?
where next ?simple measures on a whole terrace scalecreate local employmentmaximise learning and practising new skills,air...
the retrofit challenge• UK Government target to reducecarbon emissions by 80% by 2050• 85% of all buildings in existenceto...
th anks to - th e p ro j c t te am                       eClient: Sanctuary GroupArchitect: Anne Thorne Architects LLPCont...
A natural materials fabric first approach to retrofit - by fran bradshaw, anne thorne architects
A natural materials fabric first approach to retrofit - by fran bradshaw, anne thorne architects
A natural materials fabric first approach to retrofit - by fran bradshaw, anne thorne architects
A natural materials fabric first approach to retrofit - by fran bradshaw, anne thorne architects
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A natural materials fabric first approach to retrofit - by fran bradshaw, anne thorne architects

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  • Concerns over use of internal insulation using phenolic foam in ‘decent homes’ and recent retrofit research projects - issues of air-tightness, thermal bypass, embodied energy, off-gassing, etc. As a practice, benefits of natural materials have proved themselves over a number of different projects Wanted to apply this in a retrofit situation
  • Monitoring & Renewables
  • Water content increases initially due to construction drying out, then dries gradually. As we have timber against the wall, looking for RH below 70% (this woulc comply with Enerphit Standard). No driving rain issues in Haringey, London Wool chosen for it’s high water holding capabilities Wood fibre in blue has dried out straight away Wool was drying out and below 80% and heading for below 70% - but a leaking gutter soaked the wall, so waiting for further results If we see that this is an issue, we will apply a coat of water resistant breathable paint to the brickwork or render.
  • A natural materials fabric first approach to retrofit - by fran bradshaw, anne thorne architects

    1. 1. for CoREfabric first and refurbishment excellence:up-skilling to deliver the green deal andbeyondmay 2012a natural materialsfabric first approachto retrofit  
    2. 2. Hanley 2010
    3. 3. built on clay
    4. 4. a living community
    5. 5. an architectural diversity developed over time
    6. 6. Small window area giveminimum solar gain 23 St Lukes Street - part of a unified, stepped terrace - exit directly onto street - east/west orientation - uninsulated solid brick walls - uninsulated solid floor - tight for space internally - gas fire heating only - ‘hard to heat’ home
    7. 7. plan before refurbishment55m2internalfloor area
    8. 8. heat loss through before refurbishmentchimney stacks old gas boiler / hot water tank in bedroom –non airtight inefficient and noisyconstruction- major heat loss north-east facing glazed roof -through loft hatch loses a lot of heat from house- existing housedraftypoor quality thermal north-east facing rear windows -elements inadequate sunlight and- no insulation, solid increased heat lossexternal brick walls, building orientation =solid ground floors minimal solar gainand poor qualityglazing no entrance lobby - heat loss when front door opened
    9. 9. energy performance Pas s ivh au s Ene rp h it s tand ardh e at d e m and * 670 kWh /m 2 yr m ax. 25 kWh /m 2 yr TS B R e tro fit fo r th e Fu tu re targe tp rim ary e ne rgy d e m and 765 kWh /m 2 yr M ax. 1 1 5 kWh /m 2 yrair tigh tne s s(air c h ange s p e r h o u r) 1 0.9h -h TS B R e tro fit fo r th e Fu tu re targe tC O 2 e m is s io ns 1 41 kg/m 2 yr m ax. 20 kg/m 2 yrS AP rating 47** b and ‘E’e ne rgy b ills £1 1 70 a ye ar* to keep house at comfortable temperature of 21oC** standard SAP rating taken from table 7.1, English House Condition Survey 2006
    10. 10. the challenge... St Luke street St Luke street existing energy retrofit energy use use 90% reduction
    11. 11. natural materials retrofit approachhealth non-toxic production / disposal no off-gassing minimise allergieslow embodied energy carbon sequestering bio-degradable renewable materialsbetter indoor air quality naturally balances humidity exothermic - ‘phase change’protect existing fabric hygroscopic vapour permeable (‘breathing’) prevent trapped moisture
    12. 12. Passivhaus building standardhighly insulated & airtight fabricwall U-value = max. 0.15 W/(m²K)roofs = max. 0.15 W/(m²K)floors = max. 0.15 W/(m²K)thermal bridge freecontinuous air-tight layertriple glazed windowswindow U-value = max. 0.8 W/(m²K)heat recovery ventilationmin. 75% efficient heat recoverysupplies fresh, warm airlow energy solar thermal hot waterAAA+ energy efficient electrical appliances
    13. 13. Passivhaus methodology retrofit60000 Existing heat demand of 23 St Lukes Street = 33,000 kWh/yr = 660 kWh/sqm/yr5000040000 Passivhaus Standard = 15 kWh/sqm/yr Passivhaus Enerphit = 25 kWh/sqm/yr Improve Airtightness30000 Heat Recovery Ventilation20000 Insulate South Wall Insulate North Wall Existing House Insulate Floor Triple-Glazed Insulate Roof 0.20 W/m2K 0.15 W/m2K 0.10 W/m2K 0.15 W/m2K Windows10000 0 space heat demandHeat Demand (kWh/yr) Total (kWhr/yr) up to 80% reduction with fabric measures alone... overall 97% reduction in heating demand = 22 kWhr/sqm/yr
    14. 14. typical variation in occupant use of energy
    15. 15. depth of insulation - design for it! - front & rear elevations of terrace usually shortest width - chimney breasts removed to improve airtightness - compensated for floor area lost to insulation - extend kitchen with rooflight - consider splaying reveals on future projects
    16. 16. continuous insulation & air-tight layer U-Value = 0.10 Internal wall External wall Fo t rn insulation insulation Ra erEeaio l tn v U-Value = U-Value = Eeaio l tn v 0.20 0.15 New-solid floor U-Value = 0.12 Air-tight layer
    17. 17. fabric first approach - walls service zone woodfibre insulation, fixed to battens thru airtight layer airtight membrane, vapour control layer sheepswool insulation between cross battens solid brickwork with external render 0.15 W/m K2
    18. 18. avoiding thermal bridges - carefully detailed junctions floor to wall 1. continuous insulation 2. thermal bridge free 3. continuous airtight layer
    19. 19. eaves detail
    20. 20. windows in the wall - St Luke street
    21. 21. new extension walls
    22. 22. fabric first approach - walls
    23. 23. woodfibre insulation to party walls
    24. 24. monitoring moisture : internal wall insulationconstruction drying out leaking gutter soaking wall
    25. 25. airtight detailingwhat is the airtight barrier?walls and roof: air-tight membranefully plastered walldamp proof membranecarefully detailed airtight junctionstapes, windows, service penetrationsair-tightness buildabilitycommunication betweendesigner and site teamcareful site installationattention to detailmethodical sequencing
    26. 26. heat recovery whole house ventilationfresh, warm, low energy airair supply will never be lower than 16.5℃due tohigh efficiency of heat exchanger and frostprotection to unit.ventilates the whole housesupply fresh air to living room and bedroomsextract stale moist air from kitchen & bathroom + r ct of h t los es edu ion ea s + limit a h midit / a oid ir u y v mou gr h ld owtfind space for the unit and ducts + a oid bu v ild-u of pollu a t p t nscareful planning required in existing house for + limit odou srducts + clea in (f er ) n g ilt s + h t g & coolin ea in g + ma a n gesh midit u y + in ea ed comf t cr s or
    27. 27. St Luke’s Street -completed retrofit
    28. 28. St Luke street - results, calculated and measured Exis ting H o u s e R e tro fit H o u s e (50s q m ) (64s q m )H e at d e m and * 670 kWh /m 2 yr 22 kWh /m 2 yr 97% R e d u c tio nH o t wate r d e m and 27 kWh /m 2 yr 9 kWh /m 2 yr 65% R e d u c tio nEle c tric ity d e m and 38 kWh /m 2 yr 1 7 kWh /m 2 yr 55% R e d u c tio nAir tigh tne s s(air c h ange s p e r 1 0.9h -1 3.5 h -1 *** 78% R e d u c tio n h o u r)to tal p rim ary e ne rgy 788 kWh /m 2 yr 85 kWh /m 2 yr 89% R e d u c tio n d e m andC O 2 e m is s io ns 1 64 C O 2/m 2 yr 1 6 C O 2/m 2 yr 90% R e d u c tio nS AP Rating 47** 90p re d ic te d e ne rgy b ills £1 1 70 a ye ar £1 21 a ye ar 90% R e d u c tio n
    29. 29. resident experience“We are delighted to have theopportunity to be involved with thisground breaking project. We feel it isan innovative way of creating anenergy efficient and economicalhome.”“After our first two months here, welove our eco-house, and enjoy livinghere, and it’s good to feelenvironmentally responsible withouthaving to make vast lifestyle changes.“ Mr and Mrs Watt
    30. 30. what did we learn?• Whole house approach• Educated project team and committed contractor essential• Joint working opportunities between developmentand asset management teams• Found out more about particular technologies, materials& processesBUT …limitations• Replicability• Cost• Enthusiasm from residents• Only one particular house type
    31. 31. be boldwell wrapped upairtightwell ventilatedwhere next for Stoke?
    32. 32. where next ?simple measures on a whole terrace scalecreate local employmentmaximise learning and practising new skills,airtightness building techniques,once learnt never forgottenpart selfbuild by residentsproviding timebankto reduce rents
    33. 33. the retrofit challenge• UK Government target to reducecarbon emissions by 80% by 2050• 85% of all buildings in existencetoday will still be here in 2050• how best to cost stockimprovements?• a whole new approach to assetmanagement?• Sophie Atkinson - Sanctuary HA
    34. 34. th anks to - th e p ro j c t te am eClient: Sanctuary GroupArchitect: Anne Thorne Architects LLPContractor: Seddon Construction LtdQuantity Surveyor: McBains CooperServices and Structural Engineer: King Shaw AssociatesMonitoring: Building Sciences Ltd

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