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MedO Green Roof Systems

MedO GM40 Extensive Growing Medium


Radmat GM40 Extensive Growing Medium provides a suitable base for a self-sustaining plant community consisting of a combination of pre-grown wildflower and sedum plug plants or pre-grown wildflower and sedum blanket (see separate Product Data Sheets for species options). Crushed unused porous brick sourced from graded industry reject material blended with sustainably sourced organic matter (PAS100 composted green waste, FSC approved bark compost) which will supply the correct levels of nutrients for the specified type of plant growth. Peat free and compliant with FLL guidelines and GRO substrate guidelines.


Green roofs consisting of wildflower seed mix, mixed pre-grown wildflower and sedum plugs or pre-grown wildflower and sedum blanket. Install GM40 extensive growing medium on either Radmat D25 or D40 drainage/reservoir board covered with G11 filter fleece in accordance with the Radmat specification.


Apply to a depth as specified according to plant type allowing 10% post instalaltion settlement.  Indicative substrate depths are given in the table below, however the specified depth will vary based on a variety of factors including design load, building location, building height, plant species etc.  It is therefore important to consult the project specification.

Description Value
Composition Crushed bricks/compost
Volumetric weight – dry 841 to kg/m3
Volumetric weight – max water content 1421 to kg/m3
Drainage Board Radmat D25/D40
Filter Fleece Radmat G11
Delivery Form 1.2m³ Bulk Bags/25 litre Sacks/Pallet

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