Construction green breakfast - you don't have to be a hippy to build with hemp!

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Blake Lapthorn solicitors' Constuction team held a breakfast seminar on building with hemp on 28 February 2013.

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Construction green breakfast - you don't have to be a hippy to build with hemp!

  1. 1. You don’t have to be a hippy to build with hemp! Ian Pritchett
  2. 2. Contents• Overview of Lime Technology Group• Background to Tradical® Hemcrete®• Hemclad® & Hembuild®• Thermal performance• Unique funding model
  3. 3. Questions• Which is lower cost? – £5,000 – £100 per week• What is the difference between cost and value?• What make people choose – cost or value?• Who drives a BMW? 24 February 2013 www.limetechnology.co.uk 3
  4. 4. Lime Technology Group• Lime Technology Ltd. - manufacturers and suppliers of breathable construction products: – Lime mortars, plasters & renders – Insulation products• Hemp Technology Ltd. – largest hemp processing factory in Europe• Hemcrete Projects Ltd. – specialist “design & build” sub-contractor
  5. 5. Joseph Chamberlain CollegeLimetec® Mortar
  6. 6. CTRL Terminal, St PancrasLimetec® Mortar
  7. 7. Industrial Hemp Seed Shiv or Hurd Fibre s 7
  8. 8. Hemp Harvesting in UK
  9. 9. Hemp Drying
  10. 10. Hemp Baling
  11. 11. Hemp Processing (Suffolk)
  12. 12. Fuel Briquettes (from waste)
  13. 13. Breathe® Insulation (from fibre)•
  14. 14. BMW – Door Panels (from fibre)
  15. 15. Lotus Eco-Elise body shell(from fibre)
  16. 16. Hemp Shiv (woody core of stem)
  17. 17. Tradical® Hemp Binder (HB)Production (Oxfordshire)
  18. 18. Tradical® Hemcrete®
  19. 19. New TechnologyFrom Hemcrete® to Hembuild®• Traditionally Tradical® Hemcrete® was cast or sprayed in a wet site process – 6 to 8 week drying period (in good conditions) – Best suited to use between March and July• Now you can get all the benefits of Tradical® Hemcrete® in an off-site panelised system that is dried before it gets to site – Hemclad® and Hembuild® panels – No seasonal/weather restrictions
  20. 20. Hembuild®
  21. 21. U-values & Y-values• 5 standard U-values – 0.19 W/m2.K – 0.17 W/m2.K – 0.15 W/m2.K – 0.13 W/m2.K – 0.11 W/m2.K Excellent Y-values Typically 0.02 to 0.04
  22. 22. Benefits• Grown and manufactured locally• From renewable/abundant sources• Lock up carbon• Thermal stability from insulation and thermal inertia• Fire resistance• Warranties and accreditations
  23. 23. Embodied Carbon 100 80 60 40 Cavity wall 20 Clay block 0 Hemcrete -20 -40 Embodied Carbon
  24. 24. Affordable Housing
  25. 25. Affordable Housing
  26. 26. Private Houses
  27. 27. Private Houses
  28. 28. Hemcrete® Buildings
  29. 29. Hemcrete® Buildings
  30. 30. Hembuild® & Hemclad®• Bespoke Panels• Designed to fit your building• Designed by our engineers – To accommodate vertical loads – To accommodate wind loads • In plane (racking) • Out of plane (bending)• Can be used with primary structural frame – Hemclad®• Can be used without a primary frame for low rise buildings – Hembuild®
  31. 31. Hemclad® - M&S Cheshire Oaks• 4 year lead in• Design support to client team• Manufacture of 2600m2 of Hemclad® panels• Site erection of Hemclad® panels• 100% FSC chain of custody• U-value of 0.12W/m2.K
  32. 32. Hemclad® - M&S Cheshire Oaks
  33. 33. Hemclad® - M&S Cheshire Oaks
  34. 34. Hemclad® - M&S Cheshire Oaks
  35. 35. Hemclad® - M&S Cheshire Oaks
  36. 36. Hemclad® - M&S Cheshire Oaks
  37. 37. Hemclad® - M&S Cheshire Oaks
  38. 38. Hemclad® - M&S Cheshire Oaks
  39. 39. Hembuild® - Passiv Haus• Brick (& lime mortar) faced private house• Passive Haus specification• U-values – Walls – 0.11W/m2.K – Roof – 0.1 W/m2.K – Minimal thermal bridging• Air-tightness – 0.6 air changes per hour• Built using Hembuild® system
  40. 40. Hembuild® - Passiv Haus
  41. 41. Hembuild® - Passiv Haus
  42. 42. Hembuild® - Passiv Haus
  43. 43. Hembuild® - Passiv Haus
  44. 44. Hembuild® - Passiv Haus
  45. 45. Hembuild® - Passiv Haus
  46. 46. 30 year costs
  47. 47. 60 year costs
  48. 48. Hempod- 200mm thick walls
  49. 49. Standard Caston-site WallSystem
  50. 50. Thermal damping~80% for 200mm thickness
  51. 51. Humidity control ~95% for 200mm thickness
  52. 52. Science Museum Archive• Putting theory into practice – Based on Bath University test data• 10,000 Sq ft, 3-storey archive – Sits within a WWII concrete aircraft hangar – Steel frame (10KN floor loading) – CLT floors (160mm & 100mm roof slab) – Hemclad® walls (200mm) – 40mm wood fibre board cladding• Using the Hemcrete® to passively control temperature & humidity
  53. 53. Cast panels – 200mm thick
  54. 54. The hangar
  55. 55. Cross Section
  56. 56. Completed ArchivePhoto courtesy of Jennie Hills/Science Museum, London
  57. 57. Thermal modelling• Used external measured weather data from the site and the building geometry to create an IES simulation of the Hempod• Ran IES model of the SIMULATED performance of the Hempod• Exported results into a Fourier format• In parallel we created a Fourier model of MEASURED internal temperatures in Hempod (test building)
  58. 58. Thermal modelling
  59. 59. Thermal modelling• Created a mathematical relationship between Fourier models of IES SIMULATED and MEASURED internal temperatures in the Hempod and obtained a Fourier “filter”• Built and run IES model of the Science Museum Archive• Applied the (same) Fourier filter to the internal temperatures obtained from IES SIMULATION to obtain best PREDICTED performance
  60. 60. Fourier filter applied to IES simulated temperature (by Dr L. Jankovic, Emission Zero R&D)
  61. 61. Fourier filter applied to IES simulated relative humidity (by Dr L. Jankovic, Emission Zero R&D)
  62. 62. M&E System Spec.• Air handling unit system reduced from 30KW to 5KW peak load• 2KW average load• Power from PV array• M&E cost reduced by 75%• Reduced on-going maintenance costs• Cheaper than a block-work archive!
  63. 63. On-going Monitoring
  64. 64. Thermal Performance• Tradical® Hemcrete® exhibits a dynamic thermal performance that greatly exceeds that predicted in conventional thermal modelling software (IES)• Quantifying this performance shows that it is a cost effective building material• This is currently an experimental approach, but it is backed up by real monitoring data on nearly 40 buildings
  65. 65. Future Thermal Modelling
  66. 66. Future Thermal Modelling
  67. 67. Future Thermal Modelling
  68. 68. Cost Efficiency• Modelling shows heating system can be reduced from 17KW to 4KW (peak)• Saving on heating system off-sets the extra cost of the Hembuild® walls• Cost neutral on construction – Lower running costs – Lower maintenance costs – Lower CO2 emissions• True sustainability!
  69. 69. A Unique Team• Lime Technology Group• Amalgamated Capital• Mark Hines Architects• The Green Organisation
  70. 70. What we offer…• Fully funded projects – 30 year commercial bonds – Retention of appreciating assets• Innovative building system – Hembuild® – Exemplary thermal performance – Local manufacture & local jobs – Natural materials - hemp & timber• Contemporary design & master-planning
  71. 71. AmCap USP’s• Bond is provided up-front to finance the delivery of the whole project• Bond is based on income potential of the houses• Bond interest rolled up during construction period• Debt sits off the RP’s balance sheet• Asset reverts back to RP after 30 years• The ideal balance between ease, cost and value!
  72. 72. Summary• Fully funded projects – 30 year commercial bonds – Retention of appreciating assets• Local manufacture – Local jobs – Natural materials - hemp & timber• Contemporary design & master-planning• Exemplary thermal performance
  73. 73. The best way topredict the future is to create it

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