Icopal ST Wildflower Seeded - Extensive Green Roof System

BMI ST Wildflower Seeded - Extensive Green Roof System

An extensive green roof system utilising a specially formulated free-draining substrate and drainage board. A wildflower and grass seed mix is broadcast over the surface of the substrate, and lightly worked in to germinate and grow over time.

PrintIcopal ST Wildflower Seeded - Extensive Biodiverse / Meadow Green Roof System1. BMI Canopia Extensive Wildflower Seed Mix

2. BMI Canopia Extensive Biodiverse Substrate

3. BMI Canopia Filter Fleece

4. BMI Canopia Drainage Board 20 FF

5. BMI Canopia Protection Fleece

6. Icopal Waterproofing System



System Properties
The following data relates to the extensive green roof element only.
System Dry Weight: 125 kg/m²  
System Saturated Weight: 150 kg/m²
System Typical Depth: 125mm
Growing Substrate Depth: 100 mm (settled)
Contouring: Flat/level or to

Key Features

  • A system suitable for a range of roof construction types.
  • Attractive mix of wildflower and grass species.
  • More flexibility for the layout and sowing density.
  • More cost effective than plug plants or a pre-grown mat.
  • Moderate – high range of bio-diversity.
  • Moderate – provision of pollen and nectar to attract insects.
  • Suitable for flat and low pitched roofs.
  • Medium – low maintenance
  • Plant Species

    The species of plants are chosen to provide visual interest with a wide range of flowering periods and food sources to attract a diverse range invertebrates.

    The optimum time for sowing is late summer / early autumn, with April-May the next best window. Sow onto the surface but do not rake in. Instead, walk over the newly sown area to firm and level the seed bed and create good seed / soil contact.

    Flowering Period: May – August.

    Typical Colours: Seasonal variation of yellows, whites, reds and pinks. Foliage turns from green to brown in the autumn.

    Species: 38.

    Sowing Density: 2 – 5g/sqm.

    Typical Species: Wildflower and grass species. - Agrimony, Bird’s Foot Trefoil, Bladder Companion, Crested Dog’s Tail, Common Quaking Grass, Common Sorrel, Common Toadflax, Cowslip, Hoary Plantain, Kidney Vetch, Lady’s Bedstraw, Ox-Eye Daisy, Perforate St John’s Wort, Red Clover, Rough Hawkbit, Salad Burnett, Self- Heal, Small Scabious, Sweet Vernal Grass, Vipers Bugloss, Wild Marjoram, Thyme, Yarrow, Common Poppy, Cluster Bellflower, Harebell, Red Fescue, Brown Top Bent, Lesser Knapweed, Black Medic, Red Campion, Betony, Catsear, Yellow Rattle, Field Scabious, Meadow Buttercup, Cornflower, Corn Marigold.

    Flower Attraction
    Moderate mixed pollen source, applicable to Bees – Mason, Honey Bombus spp; Insects – Chrysoperla (Lacewing), hoverfly (Episyrphus), Ladybird (Harmonia), Aphidius, Aphilinus, Aphidoletes (beneficial parasitic wasps).

    Establishment Period: 12 months and typically 24– 36 months to achieve desired ground cover.

  • Design Notes & Considerations

    General Notes

    The Icopal ST Wildflower Seeded extensive green roof system can be installed on flat roofs and those with shallow pitches, generally no greater than 15°. For slopes over 9° a retention system is required. All slopes over 5° will require a mechanically fixed eaves edge restraint.

    The system can be managed more heavily to produce a controlled “wildflower meadow” type environment. Less management input may lead to the development of vegetation which progresses naturally relating to the prevailing conditions.


    A border with a recommended width of 300 – 500 mm of washed river stones (20 – 40 mm diameter) should be used around all roof penetrations and perimeters to provide a vegetation free zone.


    Irrigation required immediately after installation for up to 8 – 12 months until fully established. Once established irrigation is only generally required during prolonged periods of hot dry weather.

    Water Source: A roof top source with a pressure of 2.5 – 3 bar and a flow rate of 60 L/min is recommended to connect a temporary system if required.


    An annual maintenance schedule is recommended to remove invasive plant and weed species, to check outlets are working correctly and to apply granular fertiliser. Vegetation and flower growth is expected to be between 20 and 100mm and the flower heads will require removal 1-2 times a year. It is recommended that the roof is strimmed in the early spring and autumn (after the flowers have dropped their seed), and all material removed to allow the roof to thrive.

  • System Downloads - Datasheets & Product Information Sheets

    On this page you can download our information and documentation in one place. Click on any of the acrobat icons below and the brochure will start to download.



    download pdf BMI Canopia Green Roof Systems


    System Design Sheets

    download pdf BMI3018 ST Wildflower Mat System


    Product Information Sheets

    download pdf BMI Canopia FKD 20 Drainage and Storage Board
    download pdf BMI Canopia Extensive Multi-Layer Substrate
    download pdf BMI Canopia RMS 300 Protection and Storage Fleece
    download pdf BMI Canopia RKS 80 Edge Inspection Chamber
    download pdf BMI Canopia Washed Pebbles
    download pdf BMI Canopia TKS Plus Triangle Combi Inspection Chamber
    download pdf BMI Canopia FIL 105 Filter Fleece
  • Technical Support & Bespoke Green Roof Systems

    In the sections of our website above you can find details on many of our standard green roof systems that we offer as a simple solution to the needs of our clients most common requests.

    There are also many other alternative BMI Canopia green roof systems that we can offer as a bespoke package to meet your projects specific needs.

    How We Can Help You

    Find Local SupportBMI Canopia has a dedicated field service, with a network of technical advisers throughout the UK & Ireland, available to provide a bespoke insured green roof specification to meet your exact project requirements. Our advisory service for specifiers and contractors is free of charge. Our technical advisers are available at any time during working hours to answer queries on any aspect of green roofing design. 

    Services Include:

    Site Inspection - Experienced BMI Area Technical Managers can provide a comprehensive site inspection and condition report prior to making any recommendations for product use or installation. Site inspections can include a detailed commentary and photographic record, core sampling, fixing pull-out tests and thermographic imaging analysis where appropriate

    Design Assistance - BMI provides a range of design services to support project delivery, including all required calculations:

    • Specification - Bespoke system specifications can be generated for each project, based upon specific design criteria. Specifications can be provided in a variety of formats to suit customer requirements.
    • Drawings - Project specific detail drawings can be prepared showing critical interface detailing and airtight system terminations.

    Approved Contractors - Installation of the BMI Canopia Green Roof System is carried out exclusively by a network of trained and approved contractors who can demonstrate excellence in all aspects of roofing and landscaping. Using an BMI Approved Contractor ensures quality right from the start giving you access to a wealth of experience and technical skill protecting your investment with unrivalled guarantees.

    Installation of the BMI Canopia Green Roof System is carried out exclusively by a network of trained and approved contractors who can demonstrate excellence in all aspects of roofing and landscaping. Using an BMI Approved Contractor ensures quality right from the start giving you access to a wealth of experience and technical skill protecting your investment with unrivalled guarantees.

    Click here to find your local BMI Technical Adviser


    Alternatively our head office technical support team can be contacted on:

    0843 224 7400

    or click here to send a bespoke green roof form to our technical support team and we will contact you shortly.

Contact Icopal 0161 8654444

Find Local Support

To discuss your project in more detail please contact
Your Local Area Manager


Technical Support


0330 123 4585

Email: technical.uk@bmigroup.com


Sales Enquiries & Orders


0843 224 7400


0843 224 7401

Email: sales.admin@bmigroup.com

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