Roof Substrate "interroof-extensiv extra leicht"

According to FLL Directive

The roof substrate interroof-extensiv extra leicht is a ready-to-use, blowable substrate for multilayer construction according to FLL consisting of pumice, lava, expanded clay and compost for very low roof loads.


Extensive roof greening is mainly used for roof areas that cannot be used. Due to these locations, undemanding plant species should be used such as sedum plants.

extensive substrate for green roofs

Field of Application

  • natural roof greening with medium maintenance
  • for sedum sprouts, succulents, herbs and flat-ball plants
  • for very low roof loads

Product Description

  • components: pumice, lava, expanded clay and compost
  • structurally stable mineral / organic roof substrate
  • pressure-resistant, segregation-proof
  • optimum tread resistance
  • good structural stability
  • little subsidence
  • provides for hard-wearing green areas
  • good root development
  • good water permeability
  • good water storage capacity
  • better air supply 
  • prevents waterlogging
  • supplies the roots with sufficient nutrients and water
  • buffers the nutrients and promotes growth
  • pH-stable, low salt, long-term stable
  • weed-free
  • suitable for silo trucks, transportable up to 150 m
  • can be processed even in wet conditions and light frost

iNTERBiMS GmbH stands for careful sorting and preparation as well as for the production and supply of high-quality products with a quality management system that meets the requirements of ISO 9001:2015 according to the certificate of TÜV SÜD.

Project Example


Grain size 0-12 mm

Loose bulk density DIN EN 1097-3

approx. 800-900 kg/m³

Paving compaction

approx. 15-20 %

Weight when saturated

approx. 1.300-1.400 kg/m³

Max. water capacity

approx. 35-45 Vol.-%

PH value (CaCI2)

approx. 6,5-7,5

Salt content

approx. 0,1-0,5 g/l

Delivery Form

 ✓   Truck 

 ✓   Big Bag at 1.00 m³ / 1.50 m³

 ✓   Bag of 25 litres / 40 litres

 ✓   Silo truck