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.