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DT117/4 Class Presentations

DT117/4 Class Presentations

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