Green roof gardens have very ancient origins the hanging gardens of babylonia built by king nabucodonosor being one of the best known examples.
Green roof layers thickness.
Types of green roofs.
Green roof components growing media water holding capacity field capacity maximum water capacity astm test.
Depending on the green roof layers thickness that you go with you will need to determine which are the most important to have included.
Moisture retained by saturated media after free draining 40 60 typ.
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 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.
Basic cross sectional drawing of a green roof.
If you want an intensive or extensive green roof a landscape garden a green wall located in an office building just noise insulation or to complete the ecological function of the green roof by installing solar.
Grs root barriers come in 20 mil 30 mil and 40 mil thickness depending on the application.
Green roofs can help reduce energy costs for a building by acting as another layer of insulation between the inside and outside of the roof.
Layers 4 to 8 form the green roof system.
Each green roof is unique as their designs and performance vary by region climate and building type and use.
Protection and filtering layers drainage of the green roof together with control boxes.
This is most noticeable in intensive green roofs since there is a thicker and more consistent layer of soil which provides a higher insulating value.
It is ideal for systems that have typical green roof plants such as sedums which have shallow roots and will not present a lot of penetration pressure.
This can add an extra level of comfort and make your property in general feel a lot better to be in.
By alan burchell rubyana lyon green roof mar 3 2017.
A range of different products are available reflecting the required functions and apart from the material itself vary according to thickness 3 mm to 20 mm fibre density and mass 320 g m 2.
The various planting systems.
The use of the roofs of buildings as green roofs is one of the main strate gies used in bio architecture to limit the environmental impact of the construction.
One that we recommend considering is the green roof insulation layer.
It can add to water retention on the roof although the amount varies from 3 l m 2 to 12 l m 2 and is only really useful on slopes below 15 degrees.
A water supply with a capacity appropriate for the size of the planted area must be provided on the roof in order to protect the plants in the case of a prolonged dry period.
