Extensive MINERAL SUBSTRATE for green roofs

Roof Substrate "interroof-mineral"

According to FLL Directive

The mineral substrate interroof-mineral is a ready-to-use, blowable mineral substrate for single-layer construction according to FLL consisting of pumice and lava.

Extensive Mineral Substrate

Field of Application

  • simple roof greening with low maintenance (e.g. garages, carports)
  • for sedum sprouts, succulents, herbs and small root ball plants
  • drainage substrate, as well as a filling substrate for intensive greening with higher layer structures 

Product Description

  • components: pumice and lava
  • 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. 950-1.050 kg/m³

Paving compaction

approx. 10-15 %

Weight when saturated

approx. 1.400-1.500 kg/m³

Max. water capacity

approx. 25-35 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

About Mineral Substrates for Extensive Green Roofs

A green roof looks good and makes a significant ecological contribution to the immediate surroundings and the environment as a whole. A green roof also offers many advantages in terms of construction technology.


For example, a green roof is now often a component of ecological construction. Green roofs compensate for precipitation, as they absorb water like a sponge and rerelease it later. Also, such roofs serve as a settlement biotope for flora and fauna and therefore offer local climatic enrichment.


A green roof with an extensive mineral substrate thus shows the following advantages:

  • good microclimate,
  • improved sound and heat insulation,
  • optimal drainage effect,
  • water buffer storage,
  • reduced UV radiation and extended service life of the roof

An essential prerequisite for a green roof is the load-bearing capacity of the roof, as the additional load caused by the greening must be taken into account. For existing buildings, the load-bearing size must be determined beforehand. In the case of new buildings, the greening can be taken into account directly in the planning phase.


Most building owners prefer extensive greening. The mineral substrate height is between 5 and a maximum of 15 cm and is suitable as an ecological compensation area. The weight of extensive green roofs is, therefore, up to 150 kilograms per square metre. In the case of intensive greening, the roof substrate heights are much higher and thus lead to significantly higher roof loads.


Green roofs are generally subject to approval. For this, a construction plan must be drawn up, and static calculations must be made. Cities or municipalities can subsidise green roofs. You can find out more about this from the responsible building authority.


Plants of extensive green roofs must be very undemanding. Therefore, mixed cultures of herbs and grasses and other rather low-growing plants should be used here, as they are better adapted to changing site conditions. Thus, undemanding plants such as succulents, greens, herbs or even mosses can be used. Thus one achieves a natural appearance without much care.


With low substrate thicknesses of 2 to 6 cm, moss-sedum plantings are the right choice. These have a high resistance to drought.