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).

  1. Concrete deck primed with Permatec Primer
  2. 2 coats of Permatec Anti-Root incorporating Permaflash-R reinforcement
  3. Permaguard-F protection layer
  4. Drainage / Moisture retention layer
  5. Growing Medium
  6. Sedum blanket
20 Year System Guarantee
Permatec Extensive Green Roof System

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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