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Design support

This section will provide you with more information on the testing and quality of Vulkatec products. All blowable Vulkatec roof substrates are RAL-certified and conform to current FLL guidelines. Vulkatec is also a member of the German construction industry association Fachwerkvereinigung Bauwerksbegrünung e.V. (FBB). Please do not hesitate to contact us with your enquiries!

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RAL Certification

Design support - Quality

For green roof quality assurance, choose RAL-certified products.
You can readily recognise RAL-certified products as they now bear this new symbol:   


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Click to enlarge

You can be assured of high quality if you use products bearing this symbol. Control quality standards that are stricter than the FLL guidelines (German guidelines for the design, creation and maintenance of green roofs) have been defined in the interests of users to provide even greater quality assurance.

Play safe and demand only RAL-certified products from your suppliers and builders. You\'ll find that it pays!

The RAL certification system is based on the FLL guidelines, but has been extended to require:
  1. A declaration of the substrate raw materials and recycling potential. You will thus know exactly what is in your substrate.
  2. Quality control by producers and external institutes; maintenance of quality is thus monitored by external laboratories.
  3. Testing of environmental status per LAGA M 20 (Z 0 currently in draft form); testing involves analysis of eluates (representing roof run-off) to exclude the presence of substances that could pose a risk to the environment. The house owner can thus rest assured that no contaminants are transported with his roof run-off into drains system, cisterns or drainage areas.

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 Current Vulkatec
RAL Certificate (RAL-GZ 253)

FLL Guidelines
Design support - Quality

Guidelines for the planning, creation and maintenance of green roofs
Excerpt of the FLL:

1.1 Applicability

This "Guideline for the planning, creation and maintenance of green roofs" applies to green roofs, roof terraces, planting on deep-level garages and other building roofing surfaces with an overlap of approximately 2 m.



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1.2 Purpose

Planting on building structures, as a way of improving environmental, functional and aesthetic aspects of the work and domestic spheres, has become increasingly important in recent years and has undergone considerable methodological developments. Systems now used include "intensive", "semi-intensive" and "extensive", and various construction methods, materials and plant types are employed.
With regard to the evaluation of green roof systems, see "Evaluation of green roof systems; Recommendations for planning, approval and acceptance," FLL 1998. The purpose of these guidelines is to specify general rules and requirements for planning, creation and maintenance that meet current quality and technical standards. Additional requirements for planning and design of systems are specified at the structural level with special emphasis being placed on the building and planting regulations. These guidelines are recommended for the attention of all persons employed in the relevant industries.

9.2 Specifications

Depending on the type of planting required and the substrate substance group, specification of the following substrate parameters is recommended:
  • Environmental status
  • Plant tolerability
  • Fire class
  • Particle size distribution
  • Content of organic materials
  • Frost resistance
  • Structural stability and resistance to dislocation of covering and granular materials
  • Deformation characteristics of substrate plates
  • Water permeability
  • Maximum water retention capacity
  • Air content
  • pH
  • Content of salts
  • Content of nutrients
  • Absorption capacity
  • Viable seed/plant sections
  • Content of foreign materials

Total pore volume is not a specified parameter, but is used to determine aeration at maximum moisture content and pF 1.8.

The volume of water available to plants can be estimated on the basis of maximum water retention capacity, less approximately 10 - 15% of volume for the water retained in fine pores at pF >4.2.

The specifications for vegetation substrates are, as a rule, relevant to substrates with defined laboratory compaction.

Suitability and control tests are described in section 12.

Design support - Quality

Vulkatec is a member of the German construction industry association Fachwerkvereinigung Bauwerksbegrünung e.V. (FBB).

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The FBB was formed over a decade ago with the then revolutionary idea of promoting the concept of nature and building not as contrasts, but as an integrated whole. The FBB provides an open forum for manufacturers, planners, dealers and builders. The green roof industry is represented along with the conventional roofing industry. The FBB has since become an innovative pressure group and cooperates with other similar associations in other European countries. The FBB still follows its original aim - to make the basic concept of planting on building structures known to a more wider public using balanced, well-founded, easily understood arguments. Within the FBB, companies have the opportunity to create the positive, company-neutral framework conditions for promoting the green roof concept.
Design support - Quality

Vulkatec is a member of the Betriebs- und Regenwassernutzung e.V.(fbr)

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The fbr was formed for the purpose of promoting the increased utilisation of industrial waste water and rainwater in order to reduce drinking water use and to cut down waste water loss, while encouraging increased use of rainwater in accordance with environmental requirements. The fbr brings together those with interests in the areas of industrial waste water and rainwater utilisation, rainwater usage and maintenance of the natural water cycle. The fbr looks to the future, and ensures that its aims are compatible with the needs of the environment, science and research. The members of the fbr form special interest groups in which the various aspects of the reutilisation of industrial waste water and rainwater are considered.

The fbr was founded in November 1995 as a response to the controversial and, in some instances, inappropriate, discussions on the utilisation of rainwater that took place at that time. It recognised that there was a need to coordinate and promote research and developments, and to collect and distribute data. An important consensus among the founding members was that a unified and well-informed approach should be taken towards the concept of industrial waste water and rainwater utilisation in order to encourage the basic idea. The association provides a central institution through which its members can obtain training and information, and also form contacts with others who are active in or are interested in this area.


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