Seeded extensive green roofs

When to specify...

Seeding an extensive green roof can be an economical and practical method of greening very large areas. The Bauder Flora Seed Mixes are specifically designed for sowing at roof level they contain tackifier and fertiliser with the seed to stick the seed to the substrate so that it is not blown off or washed off the roof. This ensures the highest germination rates. To meet particular planting requirements on Biodiverse roofs seeding is often combined with plug planting to get an exact species mix.

Key features

•  All 5 seed mixes are sourced using British native species seed stock
•  RHS (perfect for pollinators) compliant
•  Buglife approved
•  Low system weight typically circa 140kg/m2
•  Height of system 150-200mm
•  13.5 Ltr of water retention within drainage board


•  Lower cost than using pre-grown blanket or plugs
•  Improve SUDs capacity of the roof
•  Fully GRO and FLL compliant
•  Different mixes to suit a range of environments
•  Assists in maximising the building's potential to meet a BAP
•  Vegetation can be chosen to fulfil BREEAM requirements
1 Bauder Flora seed mixes Flora 3 Seed Mix - General (BioSOLAR)
A blend of seed, tackifier and additives developed to maximise diversity of vegetation on green roofs.

Flora 5 Seed MixUrban
Seed mix suitable for urban areas and high rise inner city locations.

Flora 7 Seed MixChalk Grassland
Seed mix suitable for lowland chalk and limestone grassland plant communities.

Flora 9 Seed MixCoastal
Seed mix suitable for exposed roof top coastal sites.

Flora 11 Seed MixScottish
Seed mix suitable for rooftop conditions in Scotland.
Biodiverse substrate (usually 80-150mm deep to support the selected plants) Lightweight growing medium manufactured to FLL guidelines.
Filter fleece Polypropylene fleece to prevent substrate fines from entering the drainage element.
DSE 40 water retention and drainage layer Multi-functional water storage and drainage layer.
5  FSM 600 protection mat Heavy duty protection layer made from polyester and polypropylene fibres.
6 Bauder waterproofing Shown here with Plant E root resistant, SBS modified bitumen membrane reinforced with 250g/m² recycled spunbond polyester. 

Approvals, certification and guarantee

•  Guaranteed waterproofing and green roof components
•  Substrate, filtration layers and drainage boards comply with FLL guidelines

Environmental credentials

•  Substrates include a high proportion of recycled crushed brick and aggregate
•  Protection, filtration and isolation layers manufactured from recycled materials
•  DSE40 is manufactured from recycled polyethylene

Installation and maintenance

The quality and experience of the installing operative is paramount to ensuring a successful project. Bauder Approved Contractors are the only people fully trained and certified to install our products. They provide the necessary experience that our exceptional guarantee demands.