Lightweight Low Maintenance Extensive Green Roofs

Extensive green roofs are constructed using shallow depths of growing mediums, known as substrates. A substrate-based green roof will often incorporate a mixed vegetation scheme of low maintenance plants chosen to suit the project and location.

A traditional extensive substrate green roof system provides a depth of a growing medium, usually around 80-200mm to allow for the specification of a broader range of species and planting schemes. The depth of substrate helps the sedums, wildflowers, grasses, or herbs develop a strong root network making them tolerant to wind, frost, and drought.

This type of green roof system is primarily specified for their ecological benefits or aesthetic appearance rather than for general access or leisure purposes.

Technical credentials

  • A green roof protects the waterproofing from UV damage and thermal movement. Research has shown the life expectancy of the waterproofing is significantly extended and, in many cases, may last the estimated design life of the building.
  • Many local authorities favour planning proposals that incorporate green roofs within the application as it helps meet their targets on building a sustainable environment.
  • Green roofs have excellent acoustic qualities for both external sound (up to 3dB) and internal noise (up to 8dB). This can prove to be economically and environmentally effective when used on structures close to airports or industrial developments.
  • Green roofs provide enhanced, thermal performance as it can regulate the temperature within the building. This reduces the heating costs in the winter and air conditioning expenses during the summer.

The GRO code

GRO LogoThe GRO code is intended to be recognised as a code of best practice and as such it should be used to guide behaviour relating togreen roof design, specification, installation and maintenance. Bauder endeavour to work in conjunction with the GRO Code of Best Practice for the UK.


What is the Bauder green roof promise?

To give Bauder’s clients peace of mind over the long term establishment and health of their green roof, Bauder offer a Green Roof Promise which will match the duration of the underlying waterproof guarantee (see the Bauder Green Roof Promise Document).

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 guarantees demand.
Go to approved contractor information ►
Go to maintenance advice ►

Accreditations and associations

Take a look at our accreditations and associations including certifications, trade associations and our declaration of performance documents. 
View certifications here ►

Contact us today about your project

Each project is unique in its requirements, but we have case studies and examples of our work available for you to look at. If you are looking for a green roof system, then get in touch with our team to discuss your project’s individual needs.