We have been manufacturing roof substrates for over 8 years. Thanks to the experience we have gathered, we belong to the top manufacturers of substrates for green roofs. Our substrates have been tested in real life with great success.
The plants need an appropriate medium to grow. The medium developed for a green roof must meet high requirements. We prepare it taking the following properties into consideration:

• Water supply – according to FLL guidelines the water capacity of substrates used for extensive roofs should belong to the scope between 20 and 35%, and for the intensive ones – over 45%. There should also be a possibility of moistening the substrate after it has dried.
• Nutrient elements supply – in natural conditions they are provided mainly by the native substrate. The limited depth of the vegetation surface on the roof does not guarantee sufficient amount of nutrient elements. For this reason a sufficient amount of organic substance and exchangeable cations is required.
• Oxygen supply – the wet substrate should guarantee plant roots the access to oxygen. It should not lead to complete drying and to creating conditions facilitating plant decay and wither.
  Soil buffering – FLL guidelines specify appropriate pH for extensive surfaces as 5.5-7.0, and for intensive ones – 6.5-9.5. The substrate composition should protect against pH change, as otherwise this would lead to the inability to access certain nutrient elements such as e.g. phosphorus.
• Room for roots – the substrate must be stable to facilitate proper plant rooting. This protects the plants against adverse weather conditions such as e.g. wind.
• Low content of harmful elements – the constant discharge of harmful elements deteriorates the environmental conditions of the plants growing on the roof.
• Erosion-proofness – the substrate should be possibly heavy and have a rough surface. Changing weather conditions may lead to physical spoiling of the substrate. This phenomenon should be slowed down.
• Low flammability – in warm months the substrate is exposed to drying. The fire protection regulations should be complied with on the buildings.

Substrate for extensive green roofs:

• layer thickness 5 – 30 cm, for planting plants with low vegetation requirements such as sedum, succulent plants, mosses, grass, herbs and low shrubs
• weight: 50‒250 kg/m²
• properties – the structure stable for long periods of up to 10 years, resistant to frost penetration and high temperatures, low content of organic elements, excellent air penetration to the roots, easy draining of the excessive amount of water.
• packaging – big-bagi 1,5 m³ (weight ca. 1 T), bags of 50 L and as loose material

Substrates for medium-intensive green roofs

• layer thickness 30 – 60 cm, for planting perennials, grass, sedum, herbs, shrubs and small trees
• weight 200‒500 kg/m²
• properties – the structure stable for long periods of up to 10 years, resistant to frost penetration and high temperatures, low content of organic elements, excellent air penetration to the roots, good water capacity and sorption of nutrient elements
• packaging – big-bagi 1,5 m³ (weight ca. 1 T), bags of 50 L and as loose material

Substrate for intensive green roofs:

• ayer thickness 60 – 100 cm, for planting perennials, grass, sedum, herbs, shrubs and small trees
• weight 250‒600 kg/m²
• properties – substrate with large water capacity, increased percentage of organic elements facilitates plant rooting, e.g. planting grass by sowing
• packaging – big-bagi 1,5 m³ (waga 1 T), bags of 50 L and as loose material

Drainage

• high-quality mineral granules for providing drainage on green roofs. The drainage ingredients are safe for plants, they are quick to drain excessive water amount, but also capable of storing water needed by plants..
• packaging – big-bagi of 1 m³ and as loose material
  
  
  
  

While designing the structure of a green roof it is necessary to consider the future usage of the green area. There are three basic types of green roof. Depending on the usage the technical parameters and structure change. This determines also the types of plants and vegetation forms to be used.