How Do Green Roofs Work?
Green Roofs work in a rather simple way once you understand their structure and benefits.
A green roof is a simple construction which allows growth of vegetation on a roof. Suitable for most buildings, a green roof can be created on a roof pitch of less than 30 degrees. Consisting of several layers, the construction uses a range of materials to support vegetation growth while maintaining the structure below, starting with the waterproof membrane. Once the base of the structure is protected, a drainage layer and growing medium must be added to enable healthy growth, followed by the vegetation of your choice (Sedum or Wildflower are the most common and effective).
Remember your roof will need to be analysed for weight strength. A green roof, especially when saturated, can weigh more than most traditional roof materials.
Types of Green Roofs
Extensive green roofs are designed to provide a light-weight green roof with lower maintenance and a quick instant green finish. These are the most common types of green roof and here at Sedum Supply we supply and install extensive green roofs more often than other types.
Sedum is the most common choice for an extensive roof because is it highly durable against harsh conditions. It is more lightweight than other vegetation and cost effective. This type of green roof is easier to install and ideal for new bespoke roofs or existing roofs.
Semi-Intensive Green Roofs
Semi-Intensive greens roofs consist of a deeper growing medium layer and drainage layer to provide a richer system. Therefore the semi-intensive green roof allows for a bigger range of plant variations including wildflowers.
They are perfect to obtain a more aesthetic finish for areas where the roof is more visible. A higher level of maintenance is required with this type of green roof due to the vegetation and growing medium used. Our Wildflower packs are perfect for bespoke roofs where native plant species are required.
Intensive Green Roofs
Intensive green roofs are designed to resemble gardens that can be found at ground level. They include intensive landscaping and require a fully bearing roof space. Intensive green roofs are also know as ‘Roof Gardens’ and are ideal for public or highly visible roof areas.
Components of a Green Roof
The basic structure of components for a green roof are vegetation, substrate depth and drainage. The size and overall quantity of materials can vary depending for type of green roof required. Our SMART Boxes are designed to incorporate all this into one simple roof modular tray which can be installed directly onto the waterproof membrane layer. Our SMART Boxes can be purchased here.