How Thick Is A Green Roof

Its proponents were interested in creating green space in otherwise barren urban areas.

How thick is a green roof. They fall into three main categories extensive intensive and semi intensive. Building a green roof. How to construct a green roof. First you need to install a waterproof membrane that possesses monolithic properties.

There are two types of green roof. It is recommended that minimum 90 mil 2 3 mm thick reinforced butyl rubber membranes be used for green roof assemblies. The term green roof is a catchall for any roof with vegetation on it and is also sometimes referred to as an ecoroof. Roughly speaking extensive green roofs have a substrate thickness of between 4 and 15 cm and a weight of 30 to 220 kilo per m2.

An extensive green roof or sedum roof is a roof with vegetation that is more or less self perpetuating and that can further develop and maintain itself. Our permaseal 20p membrane functions as both a drainage layer and as a reservoir see image above. The modern green roof movement began in germany in the mid 1970s. Although there are no precise definitions of them an extensive green roof has a shallow growing medium usually less than six inches with a modest roof load limited plant diversity minimal watering requirements and is often not accessible.

Do not install butyl rubber waterproofing membranes when ambient temperatures are below 40 f. 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. Butyl rubber membranes only should be used in conjunction with adhesives and tapes recommended by the membrane manufacturer. Green roofs are also known as vegetative or eco roofs.

At permagard we stock an 8mm and 20mm cavity. 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. Here are some easy to follow guidelines for the construction or installation of a green roof.