Permatec Extensive Green Roof System
Lightweight green roof systems, usually incorporating sedum mats or sedum plug plants and minimal growing medium (concrete, metal or composite decks).
- Concrete deck primed with Permatec Primer
- 2 coats of Permatec Anti-Root incorporating Permaflash-R reinforcement
- Permaguard-F protection layer
- Drainage / Moisture retention layer
- Growing Medium
- Sedum blanket
Substrate preparation
The surface of the substrate (concrete, plywood, calcium silicate board, metal/insulation composite etc.) should be suitably prepared to accept the Permatec Anti-Root fully bonded system. Joints, cracks or interfaces between different substrate materials should be detailed in accordance with Permatec Anti-Root Standard Drawings and Masterspec 4414AP specification.
Membrane
Using a suitable spreader or squeegee, the first coat of hot Permatec Anti-Root compound is applied to the prepared substrate at a nominal coat thickness of 3mm. The Permaflash-R polyester reinforcement is brushed into the Permatec Anti-Root compound whilst it is still hot. All laps in the Permaflash-R should be at least 75mm wide and fully sealed with the Permatec Anti- Root compound. The second coat is applied in the same manner ensuring complete coverage of Permaflash-R at the nominal coating thickness of 3mm. The second coat of Permatec Anti- Root must be protected.
Protection
Permaguard-F sand surfaced bitumen membrane is the standard protection layer. It is applied directly to the second coat of Permatec Anti-Root whilst it is still hot and tacky. It is used on the main horizontal area which is to be subsequently covered with a range of system components such as drainage/ moisture retention layer, growing medium, sedum blanket. It is also used on unexposed detail items. The Permaguard-F protection layer should be rolled into the hot Permatec as quickly as possible. Laps in Permaguard-F to be minimum 75mm and sealed using hot Permatec Anti-Root compound.
Permaguard-M slate surfaced bitumen membrane is used on exposed upstand details. It is applied to the second coat of Permatec by controlled torch application. Laps in Permaguard-M to be minimum 75mm and fully sealed.
Detailing
Rainwater outlets and penetrations in the roof waterproofing system should be detailed in accordance with Permatec Standard Drawings and Masterspec 4414AP specification.
System components
A standard Permatec Anti Root extensive roof system will include a range of system components including: drainage/ moisture retention layer, growing medium, sedum blanket, sedum plug plants, wildflower blanket in accordance with designers’ requirements.
Downloads
Neuchâtel Permatec Standard Detail Drawings
Permatec Extensive Green Roof System Drawings
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