What is the approximate cost of a green roof? How much energy does a green roof save?

• What is the approximate cost of a green roof?

The cost of the green roof is depending on which state you are in, which would range from $10 to $25 per square foot or $108 - $269 per square meter... (one square meter = approximately 10.76 square feet). More sophisticated green roof (or green wall) installations can cost from $25 to $100 per square foot, or $269-$1075 per square meter or more.(source http://www.green-buildings.com/content/78335-green-roof-cost)

How much energy does a green roof save?

According to the Center for Climate Systems Research, a comparison of a standard black tar roof and a green roof showed these results:

One square meter of black tar roof produced 500 kWh per year. 
One square meter of green roof produced 140 kWh per year. (source http://alivestructures.com/FAQ/greenroof_faq)

On average, for one story structures, a green roof saves $4.50 per square foot on an annual basis.(source http://alivestructures.com/FAQ/greenroof_faq)

The Research of The Green Roofs

Water consumption in our daily life

Source http://www.thenewecologist.com/2010/02/8-money-saving-and-green-iphone-apps/

Source http://www.socialworkhelper.com/2013/07/19/global-water-scarcity-why-it-matters-and-what-you-can-do/

What Is The Green Roofs

http://lisantu2013.blogspot.co.uk/2013/12/green-roof.html

What Is The Method of The Green Roofs

http://lisantu2013.blogspot.co.uk/2013/12/method-of-green-roofs.html

Why We Use The Green Roofs

http://lisantu2013.blogspot.co.uk/2013/12/advantages-disadvantages-of-green-roofs.html

What Kinds of Materials and Techniques Could use in The Sustainable Buildings

What Kinds of Materials and Techniques Could use in The Sustainable Buildings

Materials

Timber 

Cob

Fired Bricks

Concrete

Glass

Metal

Green Roofs

http://lisantu2013.blogspot.co.uk/2013/12/the-green-roofs.html

Insulation

Techniques-Renewable Energy

Ground source Heat Pumps

Photovoltaic Panels

Solar Thermal Hot-Water Panels

Why We Need The Sustainable Buildings?

Environmental benefits

- Enhance and protect biodiversity and ecosystems

- Improve air and water quality

- Reduce waste streams

- Conserve and restore natural resources

Economic benefits

- Reduce operating costs

- Create, expand, and shape markets for green product and services

- Improve occupant productivity

- Optimize life-cycle economic performance

Social benefits

- Enhance occupant comfort and health

- Heighten aesthetic qualities

- Minimize strain on local infrastructure

- Improve overall quality of life

Advantages & Disadvantages of The Green Roofs

Advantages

- Extended roof life: a green roof protects the waterproofing membrane from climatic extremes,   UV light and mechanical damage doubling its life expectancy.

- Provides thermal insulation in the winter and helps to cool buildings in the summer.

- Excellent sound insulation.

- Growing mediums can be made from recycled materials, such as crushed bricks.

- Reduces water run-off

- Encourages biodiversity.

- Provides attractive green spaces


Disadvantages

- Where the roof pitch is steeper than 40 degrees, a green roof is indefeasibly expensive. (cost http://lisantu2013.blogspot.co.uk/2013/12/what-is-approximate-cost-of-green-roof.html)

- Plant growth is unpredictable because of airborne seeds and those dropped by passing        birds 

Method of The Green Roofs

Most domestic green roofs consist of a water proof underlay covered with soil or crushed stones and either topped with seed mats or planted with seeds. Sedum, a lo-growing succulent plant, is popular because it is resistant to wind, frost and drought and requires little maintenance, but a wide variety of plants can be grown as long as the building is strong enough to support the load. Using local substrates as the growing medium and panting local seeds will support local biodiversity, as will including such objects as dead wood to provide extra habitat for wildlife.

Green Roof Layer

Source https://www.google.com.hk/search?tbm=isch&q=method+of+green+roof&hl=zh-CN#facrc=_&imgdii=_&imgrc=VDWSF0Cakn4VxM%3A%3BdyLVnv57xSqY7M%3Bhttp%253A%252F%252Fenr.construction.com%252Fimages2%252F2009%252F01%252F090114-31a.jpg%3Bhttp%253A%252F%252Fenr.construction.com%252Fbuildings%252Fbuilding_types%252F2009%252F0114-watertreatmentreuse.asp%3B300%3B230

How to build Green Roofs

http://www.youtube.com/watch?v=xzTsFXB26GY

Back to http://lisantu2013.blogspot.co.uk/2013/12/the-green-roofs.html

GREEN ROOF

 source http://www.dezeen.com/2011/03/09/sky-garden-house-by-guz-architects/

A green roof or living roof is a roof of a building that is partially or completely covered with vegetation and a growing medium, planted over a waterproofing membrane. It may also include additional layers such as a root barrier and drainage and irrigation systems. Container gardens on roofs, where plants are maintained in pots, are not generally considered to be true green roofs, although this is debated. Rooftop ponds are another form of green roofs which are used to treat greywater.(Source http://en.wikipedia.org/wiki/Green_roof)

source http://www.dezeen.com/2011/03/09/sky-garden-house-by-guz-architects/

source http://www.dezeen.com/2011/03/09/sky-garden-house-by-guz-architects/

The other project from Singapore http://lisantu2013.blogspot.co.uk/2013/12/singapore-hotel-cover-with-plants.html