Inverted Green Roofs

System Build-up “Rockery Type Plants“ on Inverted Roofs

In contrast to conventional flat roof build-ups, the inverted roof is characterised by a reverse arrangement of layers. The waterproofing is applied directly onto the load-bearing roof structure. The thermal insulation layer follows on top.  As a result, the waterproofing is perfectly protected against mechanical damage.

With inverted roofs, layers that prevent the diffusion of damp must not be installed above the XPS thermal insulation boards. Therefore, the water retaining protection mat has to be replaced by the vapour permeable Separation Membrane TGV 21. In the case, that root barriers are necessary they have to be placed below the insulation boards directly onto the waterproofing. A deeper substrate layer compensates for the water retention capacity of the missing protection mat.

 

Technical Data
Build-up height ca. 110 mm
Weight, saturated ca. 120 kg/m²
Water retention capacity ca. 36 l/m²

System Solutions for Extensive Green Roofs

General overview of various extensive green roof systems and the technology involved.

 

Number of pages
16 pages
Date of publication
Jul 2018
System build-up

Diagram

Products

Grafik des Systemaufbaus
Plug Plants ”Rockery Type Plants“
System Substrate “Rockery Type Plants”
Filter Sheet SF
Floradrain® FD 25-E
Separation Membrane TGV 21
Thermal insulation XPS
Root Barrier WSF 40, if waterproofing is not root-resistant.

Product Details

Plug Plants ”Rockery Type Plants“

System Substrate “Rockery Type Plants”

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Substrate consisting of Zincolit® (sorted high quality crushed brick), enriched with Zincohum® (substrate compost enriched with fibre materials).

Filter Sheet SF

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Geotextile of thermally strengthened polypropylene, applicable as filter sheet above drainage elements for normal mechanical stress.

Floradrain® FD 25-E

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Pressure resistant drainage and water storage element of recycled polyolefin for use on extensive green roofs.

Separation Membrane TGV 21

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Water repellent, air permeable membrane of polypropylene, applicable as diffusionable separation layer, e. g. on inverted green roofs or metal decks.

Root Barrier WSF 40

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Established, proven and tested sheet, easy to install, made of environmentally friendly polyethylene for the use as root protection under extensive green roofs.

No product information available

Note

The example above shows an extensive green roof build-up with Floradrain® FD-25-E allowing for diffusion, however, most of the ZinCo drainage elements are vapour permeable so many other varieties of ZinCo build-ups can be realised on inverted roofs.

The system solution shown relates to the green roof build-up in particular. The roof construction itself is only shown schematically and must be planned and executed according to specialist rules for waterproofed roofs.