Modular Green Roof Systems
Modular green roof systems are ideal for the smaller roof space, and installers who are not a green roof installation specialist,
The green roof is supplied in pre-grown module trays units and are therefore very easy to install and put together.
Apart from ease of installation, there are a number of benefits to modular green roof systems:
- Well anchored into the intermediate layers so there is less risk of wind uplift or erosion in the crucial time period just after installation
- Modules can be individually removed - so if there are problems with the deck beneath, one “pod” or section can easily be lifted out without any disruption to the whole deck, should contractors be trying to discover the source of leaks..
The ethose of modular green roof systems is to make the whole installation process as easy as possible. When delivered to site the modules are stacked on pallets for easy craiage to the roof. Modules can be stacked 20 trays high and can be stored for a maximum of 3 days before installation.
Each module is an established instant sedum roof system in itself, so when all trays are installed, the roof is finished with nothing else being required to do; because these plants are fully established, they are less likely to be “shocked” once installed onto the roof and more likely to thrive quickly.
 The build-up of modular green roof systems is the same as with the component green roof, each tray holding the Pro-drain 60P drainage sheeting, geotextile filter layer, approximately 70mm of aggregate based substrate and a sedum blanket.
The sedum is grown from plug planted cuttings and fully established over a period of up to nine months. The root systems are fully developed throughout the substrate, and bound into the whole system.
The excess water will drain through the Pro-drain 60P by way of the slits in between each 20mm deep cups. This ensures that the system does not become waterlogged, which would cause the roots to rot.
 The substrate used contains approximately 10% compost and green matter, but is principally made up of aggregate. This can be gravel or brick based and offers the granular texture required for the roots to grip around.
The saturated weight of each tray is 50kg per m2
Sedum takes its nutrients from passing water, not by drawing it up from below, so will wrap its roots around the granules. This is why established pre-grown systems are preferable to laying sedum blankets onto substrates, as separate layers of sedum blanket will take many months to develop their root systems, making them much more vulnerable to drought and wind erosion when newly installed.
Modular Green Roof Systems Installation
Installation couldn’t be simpler. Just protect the waterproofing, lay the bottom layer of geotextile filter fabric and place the module into position on top.
A major advantage to this system is the “clip on” nature of installation. The fuss, time and skill required to install drainage layers separately is removed as it comes in a complete kit.
Each section has an overlap of Pro-drain 20P, so the egg-box shaped cells from one module can be fitted beneath the substrate of the next to achieve a secure and seamless fit together. No fixings are needed to go through into the deck, creating less disturbance to the waterproofing.
At 50kg per m2, the weight of the system will hold everything in place.
There are many different types of sedum available. We can provide flowering sedums, different textures and plants which will grow to different heights. We can also supply wildflower / sedum mixes as non-standard items. Please contact our sales office for further information.
To see the guidelines for material selection, uses, installation and planting times please call the sales office on +44 (0) 1883 715983. More information can also be found if you download the green roof system brochure (pdf).
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