A compensation model with model character.
The principle of INSECT RESPECT® is conceivably simple.
A product kills insects, which are subsequently missing in the ecological system. Compensation is created for this loss. Compensation is accomplished with the installation of insect-friendly extensive greened roofs in residential or industrial areas. This involves the creation of new greened roofs or the sanitization of existing ones.
As simple as the principle is, its implementation is difficult. In order to calculate the required compensation area, with the help of ARNAL - Büro für Natur und Landschaft AG an ecological model was created for the control-neutral insect protection. The developed method - the first of this kind worldwide - is based on the weight of the insects (living biomass) and is based on the following principle:
Captured Total Live Biomass (CTB)
Total mass of insects that were destroyed by a specific insecticide (CB), multiplied by the number of units of the respective product (P) that is put on the market during a year and is sold.
Biomass on Compensation Area (BC)
Mass of insects that can be expected on a fully developed extensive flat roof (compensation area).
Biomass on Original Area (BO)
Mass of insects that can be expected on the original area.
Correction factors (C)
The correction factors (i, h, d, b and s), which are multiplied with the expected mass of insects, serve to account for the quality of the original and compensation areas as well as the existing and expected biomass.
- Implementation date (i): Date on which the compensation area was established
- Habitat (h): Value of the compensation and original areas in terms of nature conservation and quality
- Development stage (e): Development stage or age of the compensation and original areas
- Biodiversity (b): Expected biodiversity, animal groups
- Structures (s): Existing structures that increase the quality of the habitat and the biodiversity
Compensation area (CA)
The size of the compensation area (CA) required for the intervention is determined by the difference of the total captured live biomass (CTB) and the biomass to be expected on the compensation area (BC), taking account of the correction factors (C), minus the existing biomass on the original area (BO), taking account of the correction factors (C).
The compensation projects by INSECT RESPECT® shows an example of how the formula is used in concrete terms.
Advantages of extensive green roofings
Extensive green roofings create an incomparable diversity of positive effects for the building, the human, his environment and sustainability in general:
Environmental aspects of extensive green roofing:
- Alternative living space and retreat for (rare, protected) animals and plants.
- Increase of biodiversity in settlement areas.
- Undisturbed biotope (rarely entered, marginal care, little contact with environmental pollutants).
- Barely any natural enemies due to elevated position.
- Cross linking function with other open spaces (stepping stones) and linked to that a passage function through settlement areas.
- Serve as abatement measure and are an important and valuable living space within the rule of intervention and compensation.
Economical and other positive aspects of extensive green roofing:
- Protection of the roof panel (for example, mecanical and ultraviolet rays protection).
- Longer lifespan of the roof (doubling of the sealants lifespan).
- Rain water retention, drain delay and drain storage (yearly about 50-90%) and linked to that an active flood protection.
- Increased sound insulation (reduction of the sound reflection by up to 3 dB; improvement of the soundproofing by up to 8 dB.)
- Shielding of high frequency electromagnetic radiation (for example of mobile phone base stations).
- Improved surrounding climate:
- Cooling and humidification.
- Dust binding.
- Absorption of harmful gases.
- CO2-capture and -reduction.
- Fire protection.
- Improved indoor climate.
- Cost savings (for example, on energy costs (heating, cooling), sewage fees, renovation).
- Amelioration of the cityscape by optical revaluation of visible areas.
- Usable roof surfaces and thereby quality improvement of the residential and work environment.
- Refunds and Rebates (depending on the region).
- Effectiveness increase of photovoltaic system (cooling capacity of the greening).
- Image profit (for example, due to the aesthetic appeal).
- Increase in value of the property.
CO2-Storage of extensive flat roof greenings
Extensive flat green roofings help with the storage of CO2 for the environment protection and exhibit thereby the importance of the repair of living spaces near nature and in this context how important the compensation areas of Insect Respect are.
Researches and model calcullations of Herfort, Tschuikowa and Ibañez (2012) exhibit that a three-year-long overground sedum grass herb vegetation on an 8 cm strong substrate can save an average of at least 800g/m2 CO2 per year. In comparasion intensive roof greening systems can absorb up to 2900g/m2. Model calculations have shown, that extensive roof greenings with an optimal composition of plants can absorb up to 1200g/m2 CO2. The actual CO2-storage ability of extensive green roofings is higher though, because the CO2-storage within the roots and the substrate were not considered. This has been researched by Getter et al. (2009) on areas with a substrate height of 6 cm with a sedum vegetation. Here the subterranean vegetation (roots) saves in average 107 g/m2 CO2 and the substrate again 100 g/m2 CO2.
Insect Respect compensation areas may store significantly more CO2 because their substrate strengths are higher (for example Bielefeld 12 cm, Gais 12-18 cm) and for this reason the over- and subterranean vegetation grows more abundant. In addition deadwood elements and shrubbery are installed in the areas, wich also serve as CO2-store.
Getter, Kristin L.; Rowe, D. Bradley; Robertson, G. Philip; Cregg, Bert M.; Andresen, Jeffrey A. (2009): Carbon Sequestration Potential of Extensive Green Roofs. Envrion. Sci. Technol., 43, 7564-7570.
Herfort, Susanne; Tschuikowa, Steffi; Ibañez, Andrés (2012): CO2-Bindungsvermögen der für die Bauwerksbegrünung typischen Pflanzen. Institut für Agrar- und Stadtökologische Projekte (IASP), Humboldt-Universität. Berlin.