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MedO Green Roof Systems

MedO GM20 Extensive Growing Medium


Radmat GM20 Extensive Growing Medium provides a suitable base for a self-sustaining plant community consisting of pre-grown sedum plug plants or pre-grown sedum blankets (see separate Product Data Sheets for species options). Consisting of a blend of 2/5mm, 5/10mm and 5/15mm grades of crushed brick mixed with 10mm PAS100 green compost. Compliant with GRO substrate guidelines.


Sedum based green roofs using pre-grown sedum plugs or pre-grown sedum blanket. Install GM20 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 installation 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 1000 to kg/m3
Volumetric weight – max water content 1260 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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