Green Roof Slab Thickness

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Green roof slab thickness.

There are two types of green roof. It is common practice to use the term extensive to describe green roofs that are very thin and will only support hardy drought resistant vegetation such as sedums herbs and perennials. The entire thickness of the layer is usually between than 6 to 15 cm. For roof gardens an extra load of 400 750 kg m2on the structure of the building must be accounted for compared to the 60 250 kg m2 of the extensive green roof.

Intensive to describe green roofs that are thick enough. The nominal thickness of a green roof is the approximate total height of the soil and drainage components that constitute the green roof system excluding the roof structure insulation waterproofing and plants. They provide shade to the top of a building evapotranspiration. Intensive green roofs have a higher weight and require a minimum soil thickness of at least 30 cm compared to the 5 12 cm of the latter.

Roofs with the thinnest vegetation blankets weigh around 45 to 60 kg m2 while thicker ones can be 160 to 250 kg m2 when wet. Intensive roofs which are thicker with a minimum depth of 12 8 cm 5 1 16 in and can support a wider variety of plants but are heavier and require more maintenance and extensive roofs which are shallow ranging in depth from 2 cm 13 16 in to 12 7 cm 5 in lighter than intensive green roofs and require minimal maintenance.