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Extensive green roofs are a lightweight and most low maintenance type of green roof system. They consist of hardy, succulent green plants installed so as to provide the simplest way to green flat roof structures in urban environments, and thus help to bring nature into the cities. They are a useful and very possible way to improve the aesthetics of often very stark and ugly flat roofs.

Extensive green roofs are often used on new build developments but can also be used very effectively as retro-fit enhancements to existing flat roofs and podium decks.

Being comparatively lightweight, at typically 80kg per m2 (saturated weight) they can be used on a large variety of structures.

Sedum extensive green roofs can often be installed on areas where full roof gardens could not be contemplated. Please see some case studies here. Because they are designed to be hardy and not require regular irrigation or maintenance, vast areas on rooftops and podium decks can be greened, which if replicated across a city or district, can radically change the whole aspect of cityscapes.

The main features of extensive green roofs are:

  • Lightweight – systems can be as light as 50kg per m2
  • Total build-up depth – 100 – 150mm thick
  • Simple vegetation – mainly sedum or sedum / wildflower mixes
  • Vegetation requires very low levels of nutrients
  • Use aggregate based growing medium / substrate
  • Drought tolerant
  • Saline tolerant
  • Low maintenance requirement
+44 (0)208 916 2222
Unit 16, Capital Business Centre, 22 Carlton Road,South Croydon. CR2 0BS
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