What s the difference between an intensive greenroof and a roof garden?
A roof garden usually consists of containerized plantings of various sizes placed on top of a roof. In an intensive greenroof system, all the various layers are applied on top of the entire roof deck surface, allowing unimpeded drainage and a more even weight distribution over the whole roof. The vegetation is planted directly into the soil, not in planters or containers. Explain inorganic and organic growth media. Inorganic material refers to a high porosity natural mineral element such as expanded slate, shale, extruded clay, rock wool, lava or pumice, etc., which provides aeration (and could also provide water retention capabilities), and prevents total compaction of organic matter through settling over time, and acts as a good drainage medium. The inorganic medium maintains void or air space necessary for the plant roots to breathe and for the excess water to drain properly. Organic means well-rotted humus material (hen manure, guano, mushroom compost, etc.) augmented with organic
