Green Roof systems are fast becoming an alternative way to finish a flat roof, in a manner that not only results in an aesthetically appealing finish but also helps to improve the fabric of the building and the environment in the process.

Flat green roofs generally take one of two forms:

On a flat or gently sloping roof (ie less than 5°), using only a few materials, your new green roof can be constructed relatively quickly and easily. Requiring just a filter fleece and drainage/reservoir layer along with your choice of EPDM, the green roof can be laid ready to accept your growing medium.

The drainage/reservoir layer is perforated to allow excess water to drain from the roof, preventing waterlogging of the planting. The 20mm deep studs provide a water reservoir during periods of drought. Since the water drains directly onto the roof then it is important the EPDM layer is sealed in the normal manner on the base and up the sides where necessary. The filter fleece layer, which is installed above and below the drainage layer not only prevents the planting medium being washed away as the water drains through but also acts as a root barrier to prevent damage to the waterproof membrane.

Green Roof Drainage Details