Better green roof management for maximum benefits will require characterizing quantifying and understanding the impacts of plant species and building attributes such as aspect slope height and heating on substrate performance and should be considered for future research.
Green roof substrate composition.
Therefore it has been found that green roof substrate can be optimised for specific climates or service provision.
Proportions of components vary among substrates based on target vegetation green roof type and other considerations.
Growing substrates for green roofs are typically composed of a mix of inorganic mineral and organic components.
Ph total nitrogen n tot organic carbon c org cation exchange capacity cec electrical conductivity ec and substrate moisture.
Whc indicates how well the growing substrate retains water whc should be 35 or greater for an extensive green roof and 45 for an intensive green roof up to a maximum of 65.
Whc will vary inversely with afp above and an acceptable balance of the two must be achieved.
Measured substrate parameters were.
The vegetation properties total canopy cover plant composition species richness were recorded during the growing season.
Lastly skinner s article provides very helpful information on green roof substrate composition.