An "extensive green roof" always requires thermal insulation, so if there is no thermal insulation in the existing layers, or if there is a desire to supplement insufficient insulation, the “inverted roof” system is the simplest and least costly insulation system.
Description of the layers and related product data sheets:
1. Old bitumen covering
3. Membrane (first layer)
FLEXTER TESTUDO SPUNBOND POLIESTERE
4. - 5. Membrane (second layer)
DEFEND ANTIRADICE POLIESTERE
6. Thermal Insulation
For proposals or different solutions please contact our technical department of Index S.p.A.