によって kelly chan 13年前.
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                        Green Roofs
                        
                        
                            
                            
                         
                     
                 
             
            
                
                    
                    Green Roofs
Definition
Roof covered with a layer of vegetation
Advantages
extense roof life
reduce urban heat island effect
improve urban air quality
stormwater management
environmental deucation to community
 energy benefits
Factors affecting effectiveness
moisture content of soil
Density of soil
Thickness of soil
Constrains
Modern buildings with better insulation save very little energy
existing roof must be able to support green roof weight