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Do the Green Roofs Actually Work?
Types of Green Roofs
Intensive green roof
Extensive green roof
Accessible to people.
A lot of maintenance.
Before installation the roof requires structural upgrade to support extra weight.
Inaccessible to people.
Two inspections per year.
Less weight. In some cases the roof does not need a structural upgrade.
Extensive Green Roof
Only 6 inch tall.Forms a dense carpet.
Benefits of Green Roofs
Water is stored in the plants and then returned back to the atmosphere through evaporation.
2. Energy Efficiency.Green roofs reduce the amount of energy needed to moderate the temperature of a building.
3. Better Air Quality. The plants capture airborne pollutants .4. Reduction of Electromagnetic Radiation.5. Noise Reduction. Green roofs have excellent noise attenuation, especially for low frequency sounds.Slide5
Critiques of Green Roofs
Expensive to install.
20$ per square foot + structural upgrade of the roof.
Sedum is an inadequate plant.
Low biodiversity of the roof.
Low heat management (absorbs heat instead of reflecting it).Low energy efficiency.Slide6
Do the green roofs actually work
or do they sound good only on a paper?Slide7
Installation of a green roof raises a value of building.
Example: In Boston, an $112,500 investment in an extensive green roof raised the value of a building by $2.4 Million. (J.P. Morgan Asset Management estimated the green roof has improved the value of the property by 2.4 million)
2. New York State passed legislation to provide a one-year tax abatement.Slide8
Jacob K. Javits
Convention Center Extensive Green RoofSlide9
Javits Center Green Roof
Size: 297,000 sq
. ft. Access: Inaccessible
Xero Flor XF301+1”XTManufacturer:
Xero Flor AmericaInstaller: United States Roofing Corporation
Key points:1. Manufactured in U.S.A.2.Locally Grown (Upstate NY).Supports local economy.3. Fully grown plants (9-12 months).Plants are adapted to the local environment .
Leadership in Energy and Environment Design (LEED) is a green building certification program used worldwide.
Developed by the non-profit U.S. Green Building Council (USGBC).
It includes a set of rating systems for the design , construction, and maintenance of green buildings that aims at efficient use of resources.
Cradle to Cradle (C2C) focuses on using safe materials that can be disassembled and recycled as technical nutrients or composted as biological nutrients.
Developed by the Cradle to Cradle Products Innovation Institute.Slide11
After installation of extensive green roof at Javits
26 percent reduction in the energy use.
Extended service life of the roof by shielding it from ultraviolet radiation and temperature extremes.
Prevents approximately 6.8 million gallons of runoff water per year.11 species of birds were spotted on the roof.Slide12
Initial installation is expensive.
But there is a support from the government and return on the investment.
2. Reduced energy use by 26%.
3. Biodiversity increases.4. A lot of environmental benefits.
The green roofs do work!Slide13
Do the Green Roofs Actually Work ECON 2505 Fall 2015 Types of Green Roofs Intensive green roof Extensive green roof Accessible to people A lot of maintenance Before installation the roof requires structural upgrade to support extra weight ID: 801024 Download