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Suburban Green Roof
Tommy, Kenny, Gary
Introduction
• Urban Sprawl
http://lal.cas.psu.edu/Research/sprawl.html
Cont’d
• Cramped Spaces
Reasons for Suburban Green Roof
• lot size, sunlight restriction, limited vegetation, environment
Front Back
Before & After
Suburban Green Roof
• Will increase green space• Maximize sunlight• Increase variety of vegetation
• Help filter the air• Reduce runoff• Lower green house gas• Save money in the long run• More will be discussed later on….
Implementing
Issues : Structural
Issues : Safety
Issues : Micro-Climate
Preferred plant list :
Sedum acre ‘Aureum’
Sedum album
Sedum album ‘Murale’
Sedum floriferum ‘Weihenstephaner Gold’
Sedum kamtschaticum
Sedum reflexum
Sedum sexangulare
Sedum spurium ‘Fuldaglut’
Sedum spurium ‘Roseum’
Sedum ‘John Creech’
Talinum calycinum
Issues : Permit/Inspection
Benefits of green roof
• storm water management • water filtration • visual enhancement• heating and cooling • greenhouse effect• urban biodiversity • roof life extension• sound reduction • air quality improvement • urban heat island effect• urban ecology
Important Statistic
• Storm water management plays a major role in terms of landscaping and city planning. Green roof can directly reduce (50-10%) rate of storm water runoff by absorbing water into the roof membrane and not overcome municipal sewage system[1].
Cont’d
• According National Research Council (NRC) in Ottawa, in 2001 during a hot summer day a normal conventional roof has a record of 70ºC while green roof has a record of 25ºC to 30ºC. In reference, it is approx 40ºC to 45ºC difference between conventional and green roof.
Cont’d
• The roof’s medium will infiltrate and reduce 66% of heat from ultraviolet; therefore it will extent the life of a roofline much longer. According to a study in Germany, a green roof will have double life span service than a conventional roof by 20 years
Maintenance of green roof:
• Target to be a low maintenance and stress-free roof
• Require very little watering
• Once the roof is established in period of time, trimming and weeding is necessary to maintain the green roof healthy
Total cost of green roof
• Area of extensive green roof = 630 sq ft • Re-roofing with root-repelling membrane ($ 10.00 - $ 15.00
per s.f.) = $ 6300 to $ 9450
• Green roof system (curbing, drainage layer, filter cloth and growing medium): ($ 5 - $ 10 per s.f.) = $ 3150 to $ 6300
• Plants: $1-$13 = $630 to $1890
• Installation / Labour: ($3 to $8 per s.f) = $1890 to $5040
• Maintenance: ($1.25 to $2.00 per s.f.) = $787.50 to $1260
Total Cost
• Total cost excluding (design & specifications and project administrative & site review)
Approximately
= $13000 to $24000