Empfohlen
Weitere ähnliche Inhalte
Was ist angesagt?
Was ist angesagt? (20)
Ăhnlich wie A natural materials fabric first approach to retrofit - by fran bradshaw, anne thorne architects
Ăhnlich wie A natural materials fabric first approach to retrofit - by fran bradshaw, anne thorne architects (20)
Mehr von sustainableCoRE
Mehr von sustainableCoRE (20)
KĂźrzlich hochgeladen
KĂźrzlich hochgeladen (20)
A natural materials fabric first approach to retrofit - by fran bradshaw, anne thorne architects
- 1. for CoRE fabric first and refurbishment excellence: up-skilling to deliver the green deal and beyond may 2012 a natural materials fabric first approach to retrofit Â
- 2. Hanley 2010
- 7. an architectural diversity developed over time
- 8. Small window area give minimum 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 - âhard to heatâ home
- 9. plan before refurbishment 55m2 internal floor area
- 10. heat loss through before refurbishment chimney stacks old gas boiler / hot water tank in bedroom â non airtight inefficient and noisy construction - major heat loss north-east facing glazed roof - through loft hatch loses a lot of heat from house - existing house drafty poor quality thermal north-east facing rear windows - elements inadequate sunlight and - no insulation, solid increased heat loss external brick walls, building orientation = solid ground floors minimal solar gain and poor quality glazing no entrance lobby - heat loss when front door opened
- 11. energy performance Pas s ivh au s Ene rp h it s tand ard h 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 t p rim ary e ne rgy d e m and 765 kWh /m 2 yr M ax. 1 1 5 kWh /m 2 yr air 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 t C O 2 e m is s io ns 1 41 kg/m 2 yr m ax. 20 kg/m 2 yr S AP rating 47** b and âEâ e ne rgy b ills ÂŁ1 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
- 12. the challenge... St Luke street St Luke street existing energy retrofit energy use use 90% reduction
- 13. natural materials retrofit approach health non-toxic production / disposal no off-gassing minimise allergies low embodied energy carbon sequestering bio-degradable renewable materials better indoor air quality naturally balances humidity exothermic - âphase changeâ protect existing fabric hygroscopic vapour permeable (âbreathingâ) prevent trapped moisture
- 14. Passivhaus building standard highly insulated & airtight fabric wall U-value = max. 0.15 W/(m²K) roofs = max. 0.15 W/(m²K) floors = max. 0.15 W/(m²K) thermal bridge free continuous air-tight layer triple glazed windows window U-value = max. 0.8 W/(m²K) heat recovery ventilation min. 75% efficient heat recovery supplies fresh, warm air low energy solar thermal hot water AAA+ energy efficient electrical appliances
- 15. Passivhaus methodology retrofit 60000 Existing heat demand of 23 St Lukes Street = 33,000 kWh/yr = 660 kWh/sqm/yr 50000 40000 Passivhaus Standard = 15 kWh/sqm/yr Passivhaus Enerphit = 25 kWh/sqm/yr Improve Airtightness 30000 Heat Recovery Ventilation 20000 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 Windows 10000 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
- 16. typical variation in occupant use of energy
- 17. 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
- 20. continuous insulation & air-tight layer U-Value = 0.10 Internal wall External wall Fo t rn insulation insulation Ra er Eeaio 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
- 21. 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
- 22. avoiding thermal bridges - carefully detailed junctions floor to wall 1. continuous insulation 2. thermal bridge free 3. continuous airtight layer
- 23. eaves detail
- 24. windows in the wall - St Luke street
- 26. fabric first approach - walls
- 27. woodfibre insulation to party walls
- 28. monitoring moisture : internal wall insulation construction drying out leaking gutter soaking wall
- 29. airtight detailing what is the airtight barrier? walls and roof: air-tight membrane fully plastered wall damp proof membrane carefully detailed airtight junctions tapes, windows, service penetrations air-tightness buildability communication between designer and site team careful site installation attention to detail methodical sequencing
- 30. heat recovery whole house ventilation fresh, warm, low energy air air supply will never be lower than 16.5âdue to high efficiency of heat exchanger and frost protection to unit. ventilates the whole house supply fresh air to living room and bedrooms extract 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 owt find space for the unit and ducts + a oid bu v ild-u of pollu a t p t ns careful planning required in existing house for + limit odou sr ducts + 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
- 31. St Lukeâs Street - completed retrofit
- 32. 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 n H 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 n Ele 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 n Air 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 and C 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 n S AP Rating 47** 90 p re d ic te d e ne rgy b ills ÂŁ1 1 70 a ye ar ÂŁ1 21 a ye ar 90% R e d u c tio n
- 33. resident experience âWe are delighted to have the opportunity to be involved with this ground breaking project. We feel it is an innovative way of creating an energy efficient and economical home.â âAfter our first two months here, we love our eco-house, and enjoy living here, and itâs good to feel environmentally responsible without having to make vast lifestyle changes.â Mr and Mrs Watt
- 34. what did we learn? ⢠Whole house approach ⢠Educated project team and committed contractor essential ⢠Joint working opportunities between development and asset management teams ⢠Found out more about particular technologies, materials & processes BUT âŚlimitations ⢠Replicability ⢠Cost ⢠Enthusiasm from residents ⢠Only one particular house type
- 35. be bold well wrapped up airtight well ventilated where next for Stoke?
- 36. where next ? simple measures on a whole terrace scale create local employment maximise learning and practising new skills, airtightness building techniques, once learnt never forgotten part selfbuild by residents providing timebank to reduce rents
- 37. the retrofit challenge ⢠UK Government target to reduce carbon emissions by 80% by 2050 ⢠85% of all buildings in existence today will still be here in 2050 ⢠how best to cost stock improvements? ⢠a whole new approach to asset management? ⢠Sophie Atkinson - Sanctuary HA
- 38. th anks to - th e p ro j c t te am e Client: Sanctuary Group Architect: Anne Thorne Architects LLP Contractor: Seddon Construction Ltd Quantity Surveyor: McBains Cooper Services and Structural Engineer: King Shaw Associates Monitoring: Building Sciences Ltd
Hinweis der Redaktion
- Concerns over use of internal insulation using phenolic foam in âdecent homesâ 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 itâs 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.