FAQs

A Green Roof is a roof which is covered with vegetation. Green Roofs can be either intensive or extensive, depending on the concept and the types of plants used:

  • Intensive green roofs are covered with grasses, herbs, bushes and even trees. An intensive green roof requires heavy construction work.
  • Extensive green roofs are mainly covered with mosses, sedums and herbs. Extensive green roofs are low-maintenance and lightweight.

Sedums are particularly suitable for extensive green roof applications for several reasons:

  • Sedums have a very shallow root system. As the substrate layer is shallow, this is an important consideration.
  • Sedums are resilient in the event of dehydration.
  • Sedums do not need a lot of nutrients and maintenance, unlike most plant species.
  • They are both disease-resistant and pest-resistant.
  • They are extremely adaptable.
  • Sedums recover quickly.

A Green Roof offers a host of benefits. The economic and environmental benefits include energy savings, sound insulation, a longer lifetime than conventional roofing materials, cleaner air and an improved temperature.

A Green Roof has an extra layer, compared with a conventional roof. A traditional roof can get 21°C warmer than a Green Roof. A survey conducted in Toronto (Canada) found that residents were able to save up to 23% on cooling costs per year.

A roof is continuously exposed to UV light, rain and temperature changes. Research has shown that the roofing materials of a Green Roof last approximately 3 times longer than a traditional roof covering (depending on the type of roof and the way the roof is constructed).

An Urbanscape Green Roof weighs approximately 42 kg / m² (when fully saturated). The weight of a Green Roof depends on the system chosen.

The Urbanscape substrate has A1 EUROCLASS fire classification. Furthermore, a well-installed Green Roof will tend to prevent flames from spreading if a fire occurs.

No, a Green Roof does not cause leaks. Only poor installation or incorrect specification of the ‘standard’ roofing materials will result in leaks on green roofed buildings.

The guidelines of Germany’s ‘’Forschungsgesellschaft Landschaftsentwicklung Landschaftsbau e.V.’’ (FLL) are followed in various European countries. The FLL guidelines are the first to cover the design, maintenance and installation of Green Roofs.

The price of a Green Roof depends on a number of factors: the dimensions of the roof, the requirements the roof must meet, the materials used and the surface area.

Urbanscape system comes supplied with all the elements required to put the Green Roof together. This includes:

  • Root Resistant Barrier
  • Drainage – several types available which will be specific to each project’s requirement
  • Green Roll – Growing medium to replace traditional substrate
  • Sedum Blanket
  • Profiles for retention
  • Gravel to fill the retention detail

In the UK at present there are no subsidies available for Green Roofs

Yes, we currently sell the system through several retailers and the nature of the Urbanscape Roll means the installation of the Green Roof becomes very simple and can be carried out on small projects by builders or DIYers

Depending on height, accessibility and safety regulations, the following equipment is needed: scissors, hook cutter, broom, saw, work and safety wear, and drain basket(s).

Sedums can survive with a very low water supply. If the roof starts getting dry, the roof colour may become red and brown in parts. If you prefer the plants to remain green, we recommend some watering of the green roof. During lengthy dry periods (2 weeks), we recommend watering so that the substrate is fully saturated.

Use Urbanscape fertilizer (Urbanscape Sedum Booster) twice a year, in early spring and late summer. 1 kg of Urbanscape Sedum Booster is enough for approximately 40m2.

You can order Urbanscape Sedum Booster via this website.

Yes, Urbanscape Green Roofs can be fitted with an irrigation system. The Urbanscape irrigation system is easy to install and can be equipped with an automatic dosing unit.

You will need to know: the construction method of the existing roof, its load capacity, its slope, the drainage systems currently used, the accessibility of water and electricity, and the availability of roof safety equipment. Before installation it is important to check local laws and regulations.

Extensive Green Roofs are low-maintenance. The system must be checked, sedums need to be fertilized twice a year with Urbanscape Sedum Booster, weeds need to be removed,  storm water runoff needs to be checked, and empty spots should be filled up. If there is a long dry period, the Green Roof needs to be saturated with water. For the best possible results, a maintenance contract is available.

Sedum album coral carpet

  • Flower period: June / July
  • Maximum height: ca. 10 cm
  • Colour of flowers: white
Sedum album murale

  • Flower period: June / July
  • Maximum height: ca. 10 cm
  • Colour of flowers: white
Sedum lydium

  • Flower period: June / July
  • Maximum height: ca. 10 cm
  • Colour of flowers: pink / white
Sedum acre

  • Flower period: June / July
  • Maximum height ca. 5 cm
  • Colour of flowers: yellow
Sedum sexangulare

  • Flower period: June / July
  • Maximum height: ca. 5 cm
  • Colour of flowers: yellow
Sedum hispanicum minus

  • Flower period: June / July / August
  • Maximum height: ca. 5 cm
  • Colour of flowers: white / pink
Sedum spurium fuldaglut

  • Flower period: August / September
  • Maximum height: ca. 15 cm
  • Colour of flowers: pink / red
Sedum floriferum

  • Flower period: June / July
  • Maximum height: ca. 15 cm
  • Colour of flowers: yellow
Sedum kamschaticum

  • Flower period: June / July / August
  • Maximum height: ca. 15 cm
  • Colour of flowers: yellow
Sedum hybridum immergrunchen

  • Flower period: July / August
  • Maximum height: ca. 15 cm
  • Colour of flowers: yellow
Sedum reflexum

  • Flower period: July / August
  • Maximum height: ca. 20 cm
  • Colour of flowers: yellow