Green Roof

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Green Roof
                                                  Sedum combination blanket   SDF mat   Plant-E capping sheet     G4E          PIR insulation         VB4-Expal vapour barrier  

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Benefits

• Roof farm saved 30K/yr (livingroofs.org)
• Longer lasting, up to 25 less energy use in
  summer greenroofs.net (average house of
  comparable size spends about 1672/yr)
• Hold and filter water
• 16.5ftsqd of grass produces amount of
  oxygen/human/year

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Costs

• Requires 31lbs/ft2 for extensive (not sure if
  that includes human access)
• Kalzip maintenance 2-3times/year
• Dcgreenworks.org 7-12/ft2 for water proofing
  roof along with 12-35 for plants/layers
• Solar panel cost 66/ft2

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layers

• Pvc sheet or epdm sheet on bottom (Windi by
  Pontarolo Engineering
• Followed by gravel or sand to protect pvc
  (sometimes not necessary)
• Roof protection barrier stops the roots kalzip
  nature roof
• Growing medium/ plants sedum can grow in 1-5cm
  soil 5-8cm allow grasses
• Soil

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options

• Pregrown Elt roof panels 8/ft2
• Elt panels that require soilplants 4.16
• Epdm sheets 3.33-6.80/ft2 rubbercal.com
• Windi drain could not find price
• 10 1ft3 growing medium (rip off?)
• Sedum seeds 17.00 cover 600ft2
• At kubepak.com 5cents per sedum plug 1.80 per
  ft2

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Dwight hall Details

• Last renovated 1918? facilities.yale.edu
• Roughly 5000ft2 of roof space.
• Porch roof at back
• Main building roof renovated in 1992?
• Ideally needs to be less the 9.5 degrees
• 2 whitney 5th floor