Download quality criteria substrates for green roofs

Quality Parameters for Aggregatetype Materials for Drainage Course (RAL-GZ 250/6-5)

Quality criteria – Substrates for green roofs

RAL-certified granular drainage material

Granular drainage material is defined as mixtures of graded, purely mineral-based material that absorbs excess water from the vegetation support layer and drains it into the guttering. The material can store water to a limited extent and allow roots to grow through it. Gütegemeinschaft für Substrate und Pflanzen e.V. inspects the material to assure quality.