Certified safety for Green Roofs!

FLL Test – accepted worldwide

HerbiTECT® is worldwide acknowledged and a proven biodynamically effective protection against root penetration of bituminous waterproofing membranes.

Bituminous membranes with HerbiTECT® pass all common Green Roof-tests according to DIN, FLL, EN, SIA and LDA!

Scientific research for HerbiTECT®

HerbiTECT® is the result of an interdisciplinary cooperation between producers of bituminous membranes and leading European scientific institutes and universities.


HerbiTECT® is a brown, specific smelling, with water mixable, oily fluid. It is easily soluble in liquid bitumen and many organic solvents.


Process temperature

HerbiTECT® remains solid and not volatile at usual process temperatures (up to 250° C) during the production of Green Roof-membranes. We suggest a maximum temperature of 200 °C, short-term up to 250 °C



Waterproofing membranes 

The reference dosage value for at least 4 mm thick bituminous waterproofing membranes is 0.30 - 0.40 % HerbiTECT®, based on the bitumen weight of the membrane, while we recommend the following dosages:

0.4 % for heavy load in the green roofs (e.g. intensive planting / greenery or the usage of only one layer green roof membranes)

0.3 % for less load in green roofs (e.g. extensive plating / greenery or two layers green roof membranes)


Compounds and cold applicable coatings

Based on the total weight we recommend a dosage of 0.20 - 0.25 % of HerbiTECT® depending on the hardness of the compounds.


Bituminous sealings

Based on the total weight of the sealing with a thickness of at least 3 - 4 mm, the reference dosage value is 0.23 - 0.25 % HerbiTECT®. When using pure or a high-percentage bitumen with a minimum thickness of 2 - 3 mm, a reference dosage value of 0.4 - 0.5 % based on the bitumen weight is recommended. For bitumen-sand layers with a low bitumen content, the dosage is 0.65 - 0.75 % HerbiTECT® based on the bitumen content.


Light-duty road construction / Embankment construction

The reference dosage value for light-duty asphalt roads and embankments to prevent the penetration by plants is 0.65 - 0.9 % HerbiTECT®, based on the bitumen content.


Rubber seals

HerbiTECT® should be added to the rubber compound in approximately 0.5 - 1.5 % by the weight of rubber.


Chemical and physical data

  • Chiroptical purity: op = approx. 98 % R(+) isomeric ratio
  • Density: 1,04 kg/l
  • Vapour pressure: 0,00024 Pa at 22°C
  • Decomposition temperature: at 230-240°C and a period of 10 h no decomposition
  • Igination temperature: approx. 400 °C
  • Solubility in Water: insoluble, not mixable



Can be stored for at least 3 years in closed original containers if stored properly.S