• Skip to primary navigation
  • Skip to main content
  • Skip to footer
  • UK
    • | RBS Group
    • | Austria
    • | Belgium
    • | Bulgaria
    • | Croatia
    • | Czech Republic
    • | France
    • | Germany
    • | Greece
    • | Hungary
    • | Italy
    • | Poland
    • | Serbia
    • | Slovakia
    • | Slovenia
    • | Spain
    • | Switzerland
    • | The Netherlands
    • | Turkey
    • | United Kingdom
  • en
    • English
Ravago Building Solutions UK
  • Applications
    FLAT ROOFS
    • Inverted Roofs
    • Green Roofs
    • Roof Terraces
    • Car Park Decks
    FLOORS
    • Residential Floors
    • Commercial Floors
    • Cold Storage Facilities
    BASEMENTS
    • Basement Retaining Walls
    • Basement Floors
    • Swimming Pools
  • Products
    Ravatherm XPS X 200 SB Ravatherm XPS X 300 SB Ravatherm XPS X 300 SL Ravatherm XPS X ULTRA 300 SL Ravatherm XPS X 500 SL Ravatherm XPS X 700 SL Ravatherm XPS X UB300 Ravatherm XPS X MK
  • Downloads
  • Tools
    • Declaration of Performance
    • U-Value Calculation Request
    • Ravatherm App
    • E-Learning: Introduction to Ravatherm XPS X
    • CPD Modules
    • Volume to Area Conversion
  • About Us
    • About Us
    • News
    • Case Studies
  • Contact Us
    • Subscribe to newsletter
Search
  • Applications
  • Products
    • Ravatherm XPS X 200 SB
    • Ravatherm XPS X 300 SL
    • Ravatherm XPS X 300 SB
    • Ravatherm XPS X 500 SL
    • Ravatherm XPS X 700 SL
  • Downloads
  • Declaration of Performance
  • About Us
    • About Us
    • News
    • Case Studies
  • Contact
en
Choose country

Green Roofs

Home / Applications / Green Roofs

Green roofs are a favourable solution both from an ecological and a technical point of view. The permanent loads arising from the vegetation layer, usually represent only small additional loads compared to the normal paving slab or a gravel-ballasted flat roof loads of a traditional terrace. Nature, in return, offers the following additional benefits

  • reduced load on the rainwater drainage system
  • better heat balance on the roof
  • excellent microclimate
  • considerable carbon dioxide binding ability.

Inverted roofs make excellent green roofs, and Ravatherm XPS X insulation boards are the ideal reliable thermal insulation material for this application.

For further guidance on Green Roofs: https://livingroofs.org/code-practice-green-roof-organisation/

Read More

Recommended Products

Ravatherm XPS X 300 SL

Ravatherm XPS X 300 SL is a flame retarded extruded polystyrene with exceptional lambda insulation performance and a Global Warming Potential (GWP) of less than five. It has attained a…
Read More

Ravatherm XPS X ULTRA 300 SL

Ravatherm XPS X ULTRA 300 SL is a thermal insulation product designed for inverted flat roofs, offering architects and specifiers the thinnest XPS insulation with a design lambda of 0.028…
Read More

Description

  • General
  • Technical
  • ADVANTAGES OF GREEN ROOFS

    Green roofs and roof gardens are becoming more and more important in urban environments, allowing some of the space occupied by the building footprint to return to green surface. Green roofs offer expanded living space, contribute to clean air and also have a considerable rainwater-retaining properties. Green roofs also have an indirect beneficial effect by relieving pressure on the rainwater and wastewater sewerage networks. Inverted roofs are well-proven for both extensive and intensive green roofs and provide a structural solution with long lifespan.

    The production process used in the manufacture of extruded polystyrene (XPS), results in a homogeneous, closed-cell material structure with a smooth surface (called the extrusion skin) which provides:

    • consistently high levels of thermal insulation
    • water and frost resistance
    • high strength
    • high resistance to vapour diffusion

    All of these favourable characteristics make the XPS thermal insulation material suitable for green roofs.

    GREEN ROOFS

    Extensive green roofs are principally created for their ecological advantages. The entire thickness of the layer is usually between than 6 to 15 cm. Roofs with the thinnest vegetation blankets weigh around 45 to 60 kg/m2, while thicker ones can be 160 to 250 kg/m2 when wet. In well-functioning extensive green roof, the plants used must be well adapted to drought and require little care and maintenance.

    Soil mixtures with high water-retention capacity or special mineral substrates that also act as a drain layer can be used as a topsoil layer. In the case of the latter, there is no need for a separate drain layer, and a thickness of min 6 to 10 mm is recommended. The root network of contiguous vegetation also provides for the stability required against wind-load. However, additional ballast is necessary along the green roof edges - 300mm x 50mm deep gravel.

    ROOF GARDENS

    Intensive roof gardens are roof gardens with a minimum 30-cm thick plantation soil layer, which may even be identical to the garden in the courtyard of the house. The thickness of the vegetation layer is restricted only by the load-bearing capacity of the roof slab, and, if the soil is 1 to 1.5 m deep, even small-sized trees can be planted. Typical forms of roof gardens are gardens for relaxation, children’s playground or parks, but even vegetable gardens are possible. These kinds of roof gardens have the same versatility as a normal garden, so they require regular maintenance, irrigation and appropriate nutrient supply.

    The type and composition of the topsoil for intensive roof gardens as well as the crop to be planted should be determined with the involvement of a garden designer. The wind protection of tall plants should be professionally anchored and supported.

  • INSTALLATION OF GREEN ROOFS

    The waterproofing membrane for green roofs should also be resistant to roots (e.g. FLL certification) otherwise the installation of a separate layer for protection against root penetration will be necessary. Ravago's XPS insulation boards do provide additional protection to the waterproofing membrane, but they cannot replace protection against roots.

    The vapour-permeable layer laid on top of the thermal insulation prevents fine granules from being washed into the drain layer or between the thermal insulation boards, and provides mechanical protection for the surface of the boards.

    Over the thermal insulation, as a drain layer, a 30 to 40 mm thick washed gravel, crushed stone, expanded clay aggregate or various special products (drain carpets, profiled drain plates etc.), light-weight combined systems may also be used to ensure free departure of migrant vapour through the thermal insulation.

    In green roofs, irrespective of whether it is an intensive or extensive solution, a topsoil layer with special composition is required, and the vegetation should be carefully selected.

Knowledge Base

Downloads

Contact

Downloads

download Technical Datasheet download Brochure download DOP

Knowledge Base

Downloads

Contact

NBS National BIM Library

nationalbimlibrary.com
Ravatherm XPS X 300 SB

Ravatherm XPS X 300 SB

Download
Ravatherm XPS X 300 SL

Ravatherm XPS X 300 SL

Download
Ravatherm XPS X 500 SL

Ravatherm XPS X 500 SL

Download
Ravatherm XPS X 700 SL

Ravatherm XPS X 700 SL

Download
Ravatherm XPS X MK

Ravatherm XPS X MK

Download

Footer Newsletter

Do you want to be the first to be informed about our latest technical developments and news?

E-mail address fault

NEWSLETTER (EN)

  • Confirm Humanity - Before we subscribe you, we need to confirm you are a human.
  • This field is for validation purposes and should be left unchanged.

About Us

  • About Us
  • News
  • Case Studies

Products

  • Ravatherm XPS X 200 SB
  • Ravatherm XPS X 300 SB
  • Ravatherm XPS X 300 SL
  • Ravatherm XPS X ULTRA 300 SL
  • Ravatherm XPS X 500 SL
  • Ravatherm XPS X 700 SL
  • Ravatherm XPS X UB300
  • Ravatherm XPS X MK

Tools

  • Declaration of Performance
  • U-Value Calculation Request
  • Ravatherm App
  • E-Learning: Introduction to Ravatherm XPS X
  • CPD Modules
  • Volume to Area Conversion

Contact Us

  • Contact
  • Subscribe to newsletter

Ravago Building Solutions UK Limited

technical.uk.rbs@ravago.com

Member of

Ravago Building Solutions (RBS)

Partner of

LRWA Logo CPA Logo

GRO Logo RIBA CPD Network Logo

Follow Us

™ Trademark of Ravago S.A.
  • Privacy Policy
  • Cookie Policy
  • Terms of Use
  • Anti Slavery and Human Trafficking Policy