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Green roofs pres


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DT117/4 Sustainable Build & Design - Class Presentations

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Green roofs pres

  1. 1. Green Roofs <ul><li>Defining green roofs </li></ul><ul><li>Why use green roofs? </li></ul><ul><li>Types of green roofs </li></ul><ul><li>Construction methods </li></ul><ul><li>Examples of green roofs </li></ul>
  2. 2. Defining Green Roofs <ul><li>Different definitions but simplest of them being: A roof of a structure that is covered with vegetation of some nature that can range from trees to moss </li></ul>
  3. 3. Why use a green roof system <ul><li>Provide high degree of insulation so keep heat in and cold out. Therefore reduce heating costs. Example U.K use more energy keeping buildings cool in summer than warm in winter </li></ul><ul><li>They retain between 60%-100% of rainfall. So reduces pressure on drainage systems reduce need for attenuation tanks </li></ul><ul><li>Absorbs Co2 emissions. </li></ul>
  4. 4. Why use a green roof system: continued <ul><li>Reduce the effect now referred to as “urban heat island” as cities as generally warmer than country side. </li></ul><ul><li>Other benefits include improved: </li></ul><ul><li>Life span double that of traditional roofs </li></ul><ul><li>quality of water </li></ul><ul><li>Air quality </li></ul><ul><li>amenities </li></ul>
  5. 5. 3 main types of Green roofs: first one is: Intensive green roofs: <ul><li>no limit to amount of plants or trees requires regular maintenance and access. </li></ul><ul><li>Due to depth of substrate. </li></ul><ul><li>Most expensive. </li></ul><ul><li>Likely to be found at ground level or flat roofs like apartment blocks and appear like a park with paths, benches and even playgrounds </li></ul><ul><li>One building contains 35,000 plants and 75 types </li></ul>
  6. 6. Intensive green roof: ACROS Fukuoka building in Fukuoka city Japan.
  7. 7. Semi-intensive green roofs <ul><li>This type is restricted to smaller shrubs and grasses. </li></ul><ul><li>Substrate layer is not deep enough for trees. </li></ul><ul><li>Access is required for this type but not as much as this is not designed for people. Maintenance is less than the previous example. </li></ul><ul><li>It is also less expensive. </li></ul>
  8. 8. Semi-intensive green roof: Roof cover on Airport in Amsterdam
  9. 9. Extensive green roofs <ul><li>Substrate is very minimal about 15mm </li></ul><ul><li>There is a limit on the types and amount of grass of plants used </li></ul><ul><li>This type is the lightest, the cheapest, very little in maintenance. </li></ul><ul><li>What is involved in maintenance? Using the Lawnmower to cut the grass??? </li></ul><ul><li>These characteristics make it the most applicable to domestic dwellings. </li></ul><ul><li>So I shall discuss this type in further detail </li></ul>
  10. 10. Extensive green roof: domestic dwelling
  11. 11. Methods of constructing an extensive pitched green roof <ul><li>Roof loads must be calculated ensuring roof is strong enough when soil is dry and saturated </li></ul><ul><li>Begin with ply decking and timber up stands. </li></ul><ul><li>Apply bitumen based roof felt and seal with waterproof mastic. </li></ul>
  12. 13. Methods of constructing an extensive pitched green roof <ul><li>Turf hooks are then screwed onto the roof structure </li></ul><ul><li>Followed by front edging boards to retain the soil. </li></ul><ul><li>The membrane is then laid down this is what provides the basis to which the soil grips onto and grows around. </li></ul><ul><li>This also sealed at all joints. </li></ul>
  13. 14. Membrane being rolled out.
  14. 15. Methods of constructing an extensive pitched green roof: continued <ul><li>The soil matter can then be displaced over the roof. </li></ul><ul><li>It will then be spread evenly over the roof surface. </li></ul><ul><li>Finally the grass, plants or turf can be used over the soil. </li></ul><ul><li>The green roof is then finished. </li></ul>
  15. 18. Houses that may be familiar with green roofs <ul><li>Gary Neville's proposed new house development. </li></ul><ul><li>The teletubbies house. </li></ul>
  16. 19. Gary Neville’s proposed new house
  17. 20. Teletubbies House