Green roofs are becoming increasingly a prerequisite for planning approval, either through biodiversity action plans, flood risk reduction as part of sustainable drainage systems or legislation.

 

Green roofs over many advantages for buidling developers, owners and their users. They create visual enhancement of the landscape and fully exploit the spatial
opportunities for visual and recreational benefit with the possibility of planning gain and, in economic terms, green roofs can have long term financial benefits.


Green roofing systems are principally divided into three main categories:

  • Biodiverse
  • Extensive
  • Intensive

Biodiverse roof

Biodiverse roofs are created primarily for biodiversity purposes and can aim to recreate the habitat that was lost when the building was erected, or even enhance it. A ‘Green’ biodiverse roof would generally be broadcast with an appropriate seed mix to encourage specific plant types that will support certain bird and invertebrate species.

Pre-grown mats containing mixes of drought tolerant wildflowers, grasses and herbs can also be installed to provide a more “instant” cover. Substrate depths may vary across the roof deck to promote a diversity of both shallow and deep rooted plants and ones which are more and less drought tolerant.

Extensive green roof

Extensive green roof systems generally provide a visual or biodiversity, designed to support plants with a lower maintenance requirement, e.g. sedums, grasses, mosses and some wildflower species. These planting types are able to survive on shallower substrate depths than other types of plants and require lower nutrient levels along with little or no irrigation requirement.

Intensive green roof

Intensive green roofs (also known as Roof Gardens) are
principally designed to create recreational and amenity spaces for people to
enjoy. They are generally accessible and contain features similar to
traditional gardens including lawns, trees, shrubs and hard landscaped areas.
Intensive green roof systems involve using greater substrate depths (usually above
200mm) and often create a larger weight loading on the roof. Intensive green
roof systems require a higher level of maintenance, including regular
irrigation.

Whichever type of green roof is specified Sika-Trocal recommend the use of a warm ballasted system, as this reduces the insulation thickness and effectively controls vapour diffusion. This is critical in a roofing system that will always contain moisture above the primary waterproofing membrane.

 

As experts in roofing Sika-Trocal choose to work with experts in horticulture to provide self sustaining plant communities on the roof.

Product Details

Sika-Trocal® SGmA Green Roof Systems

Sika-Trocal SGmA is a multi-layer, synthetic roof waterproofing sheet based on premium quality polyvinyl chloride (PVC) with an inlay of non-woven glass fibres.

 

DOWNLOADS

Sika-Trocal® SGmA 1.5mm

PDS | Declaration of Performance

 

Sika-Trocal® SGmA 2.0mm

PDS | Declaration of Performance

 

Vapour Control Layers

PDS 

BIM DETAILS

Sika-Trocal® SGmA Green Roof System - Polyurethane Foam Drainage Board

12, 15 & 20 year green roof system

  • Extensive green roof vegetation
  • Extensive planting medium
  • Polyurethane foam drainage board
  • S-Felt T300 or Sika-Trocal SBV lower protection layer
  • Sika-Trocal® SGmA waterproof covering
  • Polyisocyanurate foam board insulation
  • S-Vap 5000E SA vapour control layer

Sika-Trocal® SGmA Green Roof System - HDPE Drainage Board

12, 15 & 20 year green roof system:

  • Extensive green roof vegetation
  • Extensive planting medium
  • High density polyethlene drainage board
  • S-Felt T300 or Sika-Trocal SBV lower protection layer
  • Sika-Trocal® SGmA waterproof covering
  • Polyisocyanurate foam board insulation
  • S-Vap 5000E SA vapour control layer

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