Thickness Green Roof Layers

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.

Thickness green roof layers.

By alan burchell rubyana lyon green roof mar 3 2017. G 1 extensive green roofs have a much shallower growing media layer that typically ranges from 3 to 6 inches thick. They fall into three main categories extensive intensive and semi intensive. Intensive to describe green roofs that are thick enough.

Types of green roofs. 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. G 2 intensive green roofs have a growing media layer that ranges from 6 to 48 inches thick. A drainage layer a filter layer a growing medium layer substrate and a vegetation layer.

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. Intensive green roofs roof gardens and extensive green roofs. 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. Thanks to the competence and professionalisms of our team all materials used are compatible.

The green roof drainage layer thickness makes sure that nothing can go wrong below offering a solid and effective guard. Simpler shallower cheaper green roofs with limited variety of plants are called extensive green roofs these systems are easy to install require little to no maintenance or irrigation and weigh the. 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 insulating properties of the soil can also help reduce sound transmission through the roof from outside the building.

Each green roof is unique as their designs and performance vary by region climate and building type and use. Successfully managing this composite structure is the key to creating a green roof system that performs well over the long term. A green roof system consists of four layers. Thicker welded root barriers will be needed for green roofs involving trees bamboo or other vigorous spreading grasses.

It is important to check the compatibility of the product with bitumen and polystyrene especially where there is direct contact with a bitumen based waterproofing or polystyrene insulation.