Using BIM in Small Architectural Practices: Barriers and Benefits for Retrofit Projects.
Download as PPTX, PDF1 like1,061 views
The document discusses the use of Building Information Modeling (BIM) in small architectural practices focusing on retrofit projects, particularly those by Granit Chartered Architects. It details various projects with case studies to highlight the benefits and barriers of BIM in achieving energy efficiency and improved collaboration in construction. Key points include the successful use of BIM in design and construction processes, alongside challenges like financial investments and consultant engagement.
Using BIM in Small Architectural Practices: Barriers and Benefits for Retrofit Projects.
- 1. Using BIM in Small Architectural Practices: Barriers and Benefits for Retrofit Projects. James Munro Director, Granit Chartered Architects Nov 26th 2015
- 2. Q: Do we BIM? A: We've been BIM’ing it for years Q: Lonely or Collaboratively? A: Lonely, but we’re working on making friends
- 3. Introduction to Granit Architects Technology & Working Partnerships 3 Case Studies Benefits and Barriers to BIM for Retrofit
- 4. Granit Chartered Architects: • Chartered practice based in Clapham, South London • 20 staff • Passion for sustainable and low energy buildings • Members of AECB and Green Register Photo of summer party
- 5. • 90 current jobs • 85% private client – residential • 15% Commercial clients – residential • 10% new build • 90% refurbishment / extensions • Average construction value £400k • Range of £250K - £5m
- 6. Practice Ambitions: • Be experts in designing low energy, high performance buildings • Use BIM to further improve collaboration within the construction value chain • Use BIM modeling to trouble shoot pre-construction and construct better buildings
- 7. Lonely BIM (level 1) • 3D model all survey info / existing buildings • 3D information & schedules RIBA stages 1-6 • 2D info added at Stage 4 • Import & Export PDF / DXF / Sketchup Collaborative BIM (level 2) • Import & Export IFC • BIMX model – clients / QS / contractors Technology & Working Partnerships
- 8. Key points: • Retrofit to pre-1919 property • Construction 2011-2013 • Existing GIA- 115 sqm • Complete GIA – 180 sqm Primary Energy use: • Pre works – 300-400kWh/m2/yr (estimated) • CO2 – 97Kg CO2/m2yr Financial: • Contract Value £300K • Retrofit and renewable measures £75K • Predicted pay back 10-15 years Case Study 1 – Lambourn Road, Clapham
- 9. Project Objectives: • To demonstrate best practice for retrofit in solid wall housing • Enable us to give best advice to our clients on energy saving measures • Test bed for renewable technology • Achieve standards in energy efficiency approaching the retrofit for the future program target • Develop collaborative techniques to deliver an efficient design service • Monitor results and evaluate
- 10. Existing property: • Solid brick walls (external and party walls) • Conservation area – front façade to be retained • Suspended timber floors • Single glazed sash windows • Non-insulated pitched roof • 20 year old gas boiler and HWT • Background vents / Rapid extractors to bathrooms • Open fireplace
- 11. Existing House – 3D Model
- 12. Existing House – 3D Model
- 13. • RIBA Stage 2 Planning Consent and Conservation area consent • 3D views for consultation • Client sign off • Assessment of orientation and solar gain
- 14. RIBA Stages 3-4 • Solid brick walls EWI for flank, rear and all new walls • All thermal envelopes upgraded • New warm roof construction • Reduced risk of thermal bridging
- 15. RIBA Stages 3-4 • Solid brick walls IWI for existing walls (historic detailing retained and repaired) • New pitched warm roof construction • Floor junctions and lintels – possible thermal bridging details identified
- 16. RIBA Stages 3-4 • 4 different wall types identified External junctions analysed in 2D and 3D U values: • Roofs: 0.16 • New external walls: 0.15 • Refurbed walls: 0.18 • Floors: 0.14 • Windows: 1.2
- 17. RIBA Stages 3-4: 3D to 2D Construction Drawings
- 18. RIBA Stages 3 – 4 • MVHR design – 2D CAD overlays integrated into 3D model • Coordination of ducting with service voids structure
- 20. RIBA Stages 5 • Construction Stage • Re-survey follow strip out • Hand over of information for project file • Adjustment to design and construction details • Quality control paramount • Communication of air tightness and thermal bridging strategy to contractor/sub-contractor
- 21. RIBA Stages 6-7 • 18 month monitoring of energy usage • Thermal imagery • Marketing / Open House 2013/14 Top image: air permeability test • Result: 3.54 m3 / (h.m2) @50 PA • Enerphit <1 • New build 1-3 (10 under regs) Bottom image: thermal bridging analysis
- 22. kWh/m².yr Primary Energy consumption kWh/m².yr Your Energy 183 kWh/m².yr UK average Pre-retrofit Primary Energy Post-retrofit Primary Energy (measured) 0 200 400 600 800 1000
- 24. Summary of Energy / CO2 Reduction Information sourced from www.lowenergybuildings.org.uk Pre works Energy - 300-400kWh/m2/yr (estimated) CO2 – 97Kg CO2/m2yr Post works Energy – 183/m2/yr - 61% reduction CO2 – 38Kg CO2/m2yr - 40% reduction
- 25. Post completion – Summary • BIM modeling assisted with identifying key junctions & co- ordination of M and E • 3D model can disguise building structure/materials • Quality of contractor and sub- contractors key factor in meeting energy efficiency • Communication to team, including end user vital • Commissioning or balancing of MVHR to get best performance
- 26. Key points: • Enlargement and refurbishment of house • Existing GIA – 293 sqm • Complete GIA – 600 sqm • Construction 2014 – present Structures: HRW M and E: RLA Building services Primary Energy use: • Pre works - 250kWh/m2/yr (estimated) • Post retrofit - TBC Contract Value £3 Million Case Study 2 – Prince of Wales Drive, Battersea
- 27. RIBA Stage 0-1 Existing house - 3D model
- 28. RIBA Stage 2 - Planning
- 29. Integration of structures - Sketch up file export / DWG import (Not IFC) RIBA Stages 3-4
- 30. RIBA Stages 3-4 M and E MVHR – DWG Export/Import Clash Mark up by hand
- 31. RIBA – Stage 4 Full design coordination
- 32. RIBA – Stage 4 Full design coordination
- 34. RIBA – Stage 3 – 4 Full BIM model assisting interior design process
- 35. RIBA – Stage 3 – 4 Kitchen Design - 3ds file Export / 2D PDFS and DWGs Import
- 36. RIBA – Stage 3 – 4 BIMx File sharing with client
- 37. RIBA – Stage 3-4 Full BIM scheduling for Client, QS, and contractor
- 38. Summary • BIM modeling assisted with coordination of M and E / Structures and suppliers • All consultants exchange in 2D CAD • Technical design influenced subsequent planning amendments • Size of project / Fees for Stages 3-4 justify investment in full BIM model • BIMx model for client/contractor and 3D clay renders easily delivered
- 39. • Enlargement and refurbishment of post war house. • Fully upgraded to exceed Part L of regulations • Existing GIA - 183 sqm • Complete GIA – 406 sqm Construction 2013-2015 • Structures – Mitchinson Macken • MVHR – Built Environment Technology • Contract Value £1.1 Million Case Study 3 – Abercorn Place, St Johns Wood
- 40. Survey company 2D CAD to 3D model
- 41. Structural Engineer – 2D CAD to 3D model
- 42. MVHR supplier 2D CAD to 3D model
- 43. Specialist stair company – Export Sketch up file / Import 2D DWGs
- 44. Building detailing – identifying potential cold bridging details in fabric. 3D and 2D drawing communicated to contractor.
- 45. Summary • Post war house- rational orthogonal shape assisted CAD model • BIM modeling assisted with coordination of M and E / Structures and specialist stair design • All consultants exchange in 2D CAD • Stair design developed and exchanged in 3D model (Sketchup file)
- 46. Benefits of BIM for retrofit projects Clash detection between structure / architectural / M and E Existing, demolition and new elements can be viewed simultaneously Thermal bridging junctions identified Easier for client to visualise concepts (extra service) 3d construction details to communicate to contractor Hand over of 3D file to project file Archicad Eco Designerstar Virtual Energy use = Real energy use
- 47. Barriers of BIM for retrofit projects: Getting consultants on board for all project types More time up front in 3d modeling Financial investment for client Working with existing buildings (real buildings are not square) Can disguise reality of construction details Not a substitute for site inspection / Quality control
- 48. Comments from consultants: “We are embracing BIM, all our models are modeled in Revit in 3D. Even small projects” HRW Engineers “ We do not intend to embrace BIM, yet, due to no demand from clients, and issues of cost and training” RLA Building Services “ What’s an IFC file? Tried Revit once, found it very time consuming and long winded. Use Autocad!” Technician at Mitchison Macken
- 49. Thank you Email: james@granit.co.uk Telephone: +44(0)20 7924 4555 Website: www.granit.co.uk Twitter: @LondonArchitect
Editor's Notes
- #4: Client base / project types Practice ambitions
- #5: (2 directors, 4 architects, 3 interior designers, 9 architectural assistants, 2 admin)
- #8: Structural Engineers / M and E Consultants: Autocad & Hand sketches Glazing / MVHR / Renewable suppliers: Autocad : Archicad 19 – Mac Workstations / Team work server
- #10: retrofit for the future program target of 115 kWH/m2yr and 80% reduction in CO2
- #22: Client feedback and internal review
- #34: Difference between 2d and 3d- less dependent on 2d detailing