Product Guidance

Drainage Layer:

  • GuaraDRAIN retention layer
  • Thickness = 15/20mm
  • Can be cut and shaped around particular details

Geotextile Filter Fleece:

  • GuaraFLEECE Recycled multi-coloured polyester
  • Weight = 300 g/m2
  • Laid above and below drainage layer

Growing Medium:

  • 12-75mm crushed brick/rubble (60-80%)
  • Locally sourced marine aggregate & grit (5-10%)
  • Growing medium (10-20%)
  • Wood mulch (10-20%)


  • Sedum/wildflower seeds are planted with native/local plants
  • A natural sustainable habitat can be created using laps
  • Very low maintenance and no irrigation required
  • Opportunities to recycle site waste in substrate (this must be tested prior to being used within the GuaraGREEN Roofing System)

Maximum Roof Slope:

  • 15°

Product Specification


– Name: Guaranteed Asphalt Ltd
– Email:

– Product Reference: Component GuaraGREEN Extensive/Biodiverse Green Roof System
– Drainage Layer: GuaraDRAIN (15/20mm)
– Growing Medium: Low Nutrient
– Fertiliser: Not Required
– Vegetation: Sedum/wildflower mix
– Vegetation Barrier 20-40mm washed pebbles

GuaraMET edge retainer
– Outlet Inspection Chamber GuaraSPECT inspection chamber (500 x 500 x 100mm)