Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Riba South Sustainability Through Envelope Efficiency


Published on

Published in: Technology, Business
  • Be the first to comment

  • Be the first to like this

Riba South Sustainability Through Envelope Efficiency

  1. 1. Matt Robinson Natural Building Technologies
  2. 2. Natural Building Technologies <ul><li>Environmental building systems. </li></ul><ul><li>Full technical support in sales, design, specification and on-site </li></ul><ul><li>Our systems are proven on the continent over many years and tens of thousands of buildings on the continent and now UK. </li></ul><ul><li>Cost effective when compared to ‘traditional’ UK systems. </li></ul>
  3. 3. The Issue: Buildings <ul><li>Use too much: </li></ul><ul><ul><li>Energy </li></ul></ul><ul><ul><li>Resources </li></ul></ul><ul><li>Generate too much: </li></ul><ul><ul><li>Waste </li></ul></ul><ul><ul><li>C0 2 </li></ul></ul><ul><li>Are Unhealthy </li></ul>
  4. 4. The Issue – UK energy use
  5. 5. The Agenda: Energy in Buildings
  6. 6. The route: Policy <ul><li>2006, 2010, 2016 building regs – Part L </li></ul><ul><li>Code for Sustainable Homes </li></ul><ul><li>Low Carbon Building Programme </li></ul><ul><li>Green Taxes? </li></ul>
  7. 7. Issues: Is Zero truly 0 ? <ul><li>What if we use a lot of energy and resources, and create a lot of pollution to do ‘Zero’? </li></ul><ul><li>What if ‘Zero’ doesn’t exist? </li></ul><ul><li>Is there a ‘sweet spot’ just below ‘Zero’? </li></ul>
  8. 8. Issues: Inertia and Resistance <ul><ul><li>Lack of Knowledge and mis-information </li></ul></ul><ul><ul><li>Very poor standards of construction </li></ul></ul><ul><ul><li>Centered around multiple trades, not buildings </li></ul></ul><ul><ul><li>Liability contracts vs responsibility contracts </li></ul></ul><ul><ul><li>Capital cost reduction </li></ul></ul>
  9. 9. Issues: Inertia and Resistance <ul><li>Really Sustainable? </li></ul><ul><ul><li>Greenwash </li></ul></ul><ul><ul><li>Theory vs Reality </li></ul></ul><ul><ul><li>Offsetting is wrong </li></ul></ul><ul><li>Who checks the claims? </li></ul>
  10. 10. Issues: A tale of two halls Sheffield Town Hall - 1897 ‘ D’ Rating, 218kwh/m2/yr London City Hall - 2003 ‘ E’ Rating, 267kwh/m2/yr +30% CO 2/ kwh/m2/yr
  11. 11. Current Situation <ul><li>Stamford Brook: </li></ul><ul><li>710no, cavity wall masonry dwellings </li></ul><ul><li>Monitoring of design and construction issues by Leeds Met. University. </li></ul><ul><li>CO 2 Was 10%ish better than 2006 standards </li></ul><ul><li>Many other sustainable features (recycling, wildlife, transport etc) </li></ul><ul><li> </li></ul>
  12. 12. Current Situation <ul><li>Stamford Brook: </li></ul><ul><li>710 cavity wall masonry dwellings </li></ul><ul><li>Monitoring of design and construction issues by Leeds Met. University. </li></ul><ul><li>CO 2 Was 10%ish better than 2006 standards </li></ul><ul><li>Many other sustainable features (recycling, wildlife, transport etc) </li></ul><ul><li> </li></ul>42% missed the 5ach target for infiltration Heat loss co-efficient 75-105% worse than predicted
  13. 13. Stamford Brook Findings: Infiltration Lights, loft hatches, wall/floor and wall/roof junctions, partition walls Patio door – unsealed threshold Rooflights leaked around frames, seals and trickle vents Service penetrations particular problem
  14. 14. Stamford Brook Findings: Heat loss <ul><ul><li>Y-values </li></ul></ul><ul><ul><ul><li>Poor design AND </li></ul></ul></ul><ul><ul><ul><li>Not built ‘as designed’ </li></ul></ul></ul><ul><ul><li>Party wall heat losses </li></ul></ul>
  15. 15. Stamford Brook Findings Nominal vs. Realised Heating System Efficiencies Nominal vs. Realised Thermal Bridging Y-values Nominal vs. Realised Fabric U-values ‘ Build-ability’ problems and lack of knowledge Occupant effects – e.g. Removing CFL’s
  16. 16. UK Construction Standards: Some Shocking Facts <ul><ul><li>50% of new builds miss ‘as designed’ energy use by up-to 50%. </li></ul></ul><ul><ul><li>30% of new builds fail infiltration standard of 10ach@5pa </li></ul></ul><ul><li>Energy Saving Trust (2004) </li></ul><ul><li>Room in roof U-values on average 104% worse than ‘as calculated’ </li></ul><ul><ul><li>Average full-fill cavity wall was 20% worse than ‘as calculated’ </li></ul></ul><ul><li>Dept. Environment Travel Regions (DETR) (2001 report) </li></ul><ul><li>Energy use in residential buildings has increased by 20% since 1970 </li></ul><ul><li>Building Research Establishment (BRE 2003+2007) </li></ul>
  17. 17. If I was to go there, would I start here? UK Construction industry 2008 UK Construction industry 2016
  18. 18. Solutions? <ul><li>Eco-clichés get in the way of good, efficient and truly environmental solutions. </li></ul><ul><li>Howard Liddell </li></ul>
  19. 19. Solutions ?
  20. 20. Solutions: Technology Problems <ul><li>Overstatement of performance </li></ul><ul><li>Inappropriate site’s </li></ul><ul><li>Maintenance costs </li></ul><ul><li>Embodied energy </li></ul><ul><li>ROI, Payback </li></ul><ul><li>Disposal / recycling </li></ul><ul><li>Capital expenditure choices </li></ul><ul><li>UK cost </li></ul><ul><li>Excuse for envelope </li></ul>
  21. 21. Solutions
  22. 22. There is Another Way! We have the solutions We have the knowledge We have the research We have the built case-studies Its been done before (Look over the North Sea and oop North at our neighbours...)
  23. 23. The Solution <ul><li>“ Construction is about creating thermal efficiency, not mini power stations.” </li></ul>Imtiaz Farookhi Chief Executive NHBC
  24. 24. Eco or Sustainable or.... <ul><li>Passive Haus </li></ul><ul><ul><li>‘ Ultra low energy building standard.’ </li></ul></ul><ul><li>R2000 </li></ul><ul><ul><li>‘ ...based on an energy consumption target.’ </li></ul></ul><ul><li>Minergie </li></ul><ul><ul><li>‘ ...quality label for new and refurbished low-energy-consumption buildings.’ </li></ul></ul><ul><li>UK 2006 L2 </li></ul><ul><ul><li>‘ Conservation of fuel and power...’ </li></ul></ul>
  25. 25. Solutions!
  26. 26. Where are the savings? <ul><li>Clear that space heating and DHW are the key areas </li></ul><ul><li>Lights, appliances and cooking are 'simple' </li></ul>
  27. 27. We have the solution no.1 <ul><li>Thermal coherence of the building shell </li></ul><ul><ul><li>Good (low) U Values </li></ul></ul><ul><ul><li>Good (low) Y Values </li></ul></ul><ul><ul><li>Low Infiltration rates </li></ul></ul><ul><ul><li>Thermal response </li></ul></ul><ul><ul><li>Decrement Delay </li></ul></ul>
  28. 28. We have the solution no.2 <ul><li>Passive features </li></ul><ul><ul><li>Building form </li></ul></ul><ul><ul><li>Orientation </li></ul></ul><ul><ul><ul><li>Passive solar (heat) gain </li></ul></ul></ul><ul><ul><ul><li>Passive solar (light) gain </li></ul></ul></ul><ul><ul><ul><li>Manage glazing heat loss </li></ul></ul></ul><ul><ul><li>Shading (planting or built </li></ul></ul><ul><ul><li>Shelter belts </li></ul></ul>Images: Greenspec
  29. 29. We have the solution no.3 <ul><li>Increase in air-tightness means: </li></ul><ul><li>Air Quality </li></ul><ul><ul><li>Avoid toxic or off-gassing materials </li></ul></ul><ul><li>Ventilation </li></ul><ul><ul><li>10-3ach = Passive ventilation? </li></ul></ul><ul><ul><li>3ach or better = MVHR? </li></ul></ul>
  30. 30. We have the solution no.4 <ul><li>Moisture management </li></ul><ul><li>Active </li></ul><ul><ul><li>effective ventilation (MVHR or passive) </li></ul></ul><ul><li>Passive </li></ul><ul><ul><li>True ‘Breathing wall’ systems </li></ul></ul>
  31. 31. We have the solution no.5 <ul><li>Appliances </li></ul><ul><ul><li>A-rated </li></ul></ul><ul><ul><li>Low energy lights </li></ul></ul><ul><li>Hot water </li></ul><ul><ul><li>Reduce demand </li></ul></ul><ul><ul><li>Reduce dead legs and pipe runs </li></ul></ul><ul><ul><li>Heat efficiently </li></ul></ul>
  32. 32. We have the solution no.6 <ul><li>Lower heating and cooling loads and peak demands </li></ul><ul><li>= </li></ul><ul><li>use renewables effectively </li></ul>
  33. 33. Summary of ‘The Solution’ <ul><li>Efficiency / passive is 80% of the battle </li></ul><ul><li>Renewables / active /technology are last 20% </li></ul><ul><li>Think about managing moisture & removing toxins </li></ul>
  34. 34. If you could focus on one thing.... <ul><li>“ Thermal bridging was shown as the worst area of non-compliance. Other significant non-compliance areas included conservatories, u-values , areas of windows , doors and rooflights , internal lighting , commissioning certificates , O&M manuals and air-leakage” </li></ul><ul><li>The Energy Efficiency Partnership for Homes (Future Energy Solutions) </li></ul><ul><li>Building Regulations Compliance (BRE ) </li></ul>
  35. 35. The Effect of y-values
  36. 36. The importance of detailing: ThermoPlan <ul><li>Window on ‘outside’ = psi of 0.159w/m2/k </li></ul><ul><li>Window ‘setback’ = psi of 0.099w/m2/k </li></ul>
  37. 37. Low Ψ values <ul><li>Un-accredited + 0.15w/m 2 /k </li></ul><ul><li>Accredited + 0.08w/m 2 /k </li></ul><ul><li>ThermoPlan +0.04w/m 2 /k </li></ul><ul><li>Pavaclad +0.04w/m 2 /k </li></ul><ul><li>Diffutherm + 0.02w/m 2 /k </li></ul>
  38. 38. UK Construction: The Solution <ul><ul><li>Use systems that have proven track record in low energy buildings. </li></ul></ul><ul><ul><li>Use systems that with low Ψ / Y values and low U-values. </li></ul></ul><ul><ul><li>Ensure that U, Ψ and Y values are built ‘as designed’ </li></ul></ul><ul><ul><li>Use construction systems that have an airtight strategy and a contractor responsible for airtightness. </li></ul></ul>
  39. 39. Build it efficiently Article: Joseph Little, Deantus Projects Ltd in Construct Ireland Is this the real challenge?
  40. 40. Change:- Its not (just) Architects... <ul><li>Supply chain delivery </li></ul><ul><li>Certification processes </li></ul><ul><li>Training in ALL parts of the industry </li></ul><ul><li>New design and aesthetics (*waves bye to bricks*) </li></ul><ul><li>Site organisation – shell building </li></ul><ul><li>From liability to responsibility </li></ul><ul><li>Financial and insurance drivers </li></ul><ul><li>Home owner education </li></ul>
  41. 41. Holistic Solutions <ul><li>Energy </li></ul><ul><li>Carbon </li></ul><ul><li>Resources </li></ul><ul><li>Building Fabric </li></ul><ul><li>Human Health </li></ul><ul><li>Deliverability </li></ul><ul><li>Durability </li></ul>
  42. 42. Its a Team Effort <ul><li>Client </li></ul><ul><li>Architects </li></ul><ul><li>Planners </li></ul><ul><li>M&E </li></ul><ul><li>Structural </li></ul><ul><li>Building Control </li></ul><ul><li>Contractor </li></ul><ul><li>Subbie </li></ul>They need to understand all this (and more)
  43. 43. Summary <ul><li>Set clear targets </li></ul><ul><li>Efficiency, Efficiency, Efficiency </li></ul><ul><li>Good passive design and detailing </li></ul><ul><li>The building envelope comes first </li></ul><ul><li>Airtightness and Insulation </li></ul><ul><li>Ventilation </li></ul><ul><li>Simple vs Technology </li></ul><ul><li>Get a good team </li></ul><ul><li>Its not easy </li></ul>
  44. 44. Matt Robinson Natural Building Technologies