How To Install Enviromat
How to create a living green roof using Enviromat
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Installing Enviromat is quick and easy but to ensure the best results from your sedum matting, there are a few simple points to remember and guidelines to follow.
1. BE SAFE
Enviromat can be quite heavy, especially when wet. A 1m x 2m roll can weigh as much as a grown man, so installing it is not a one person job. Take extra care if you are creating a green roof; before you order think about how you will get materials on to the roof and how you will stay safe while working at height.
2. Avoid Installing Enviromat directly on to soil
Weed seeds can be blown in on the wind or dropped by birds into sedum matting. During a summer drought, sedum plants will survive the dry weather but weeds whose roots can't reach water in the soil will die out - saving you the trouble of weeding! Always put a layer of strong waterproof membrane (eg butyl pond liner) on to the soil before installing Enviromat.
3. Check that your building is suitable for a green roof
Load bearing capacity, slope and aspect are all vitally important. Our Green Roof CD ROM has more information. Please email us if you would like a copy.
4. Install Enviromat on to a smooth surface
Enviromat must be in contact with the surface below at all times - any air pockets beneath the plants' roots will lead to dead patches in your sedum matting. Enviromat will mould itself to gentle contours but it isn't flexible enough to cope with sudden changes of incline - eg. corrugated tin.
5. On a flat surface (less than 3 degrees of slope) use drainage matting
Drainage mat is a special lightweight layer that sits beneath Enviromat to make sure the plants' roots are never sitting in water. Sedum plants will not survive waterlogging.
6. Always use water retention matting
Sedum plants are drought tolerant, but they're not drought proof. Water retention mat is a light weight, relatively inexpensive fleece that helps make sure that the plants have enough water to stay healthy and vigorous. Use water retention matting on top of drainage mat and immediately below Enviromat (or between waterproof membrane and Enviromat on a slope)
7. On a slope of 10 degrees or more, irrigation should be available
This is just a precaution and unless the slope is very steep, irrigation is rarely needed. It's enough to make sure you have a hosepipe that can reach your Enviromat if necessary.
8. Steer clear of having small pieces of Enviromat at the edge
They will dry out much faster than larger pieces - plan your project before you start.
9. Avoid walking or kneeling on the plants as you are installing them
In this way, they will settle in much faster.
10. Unfold flaps
Tucked beneath each piece of Enviromat is an extra flap of geotextile mat; unfold this and put the next piece of sedum mat on top of the flap - this will help to anchor your Enviromat.
11. Always feed and water your Enviromat as soon as it is installed
We recommend using Nutrifusion Spring and Summer feed because it has the right balance of nutrients and it's a granular feed so it's easy to spread. Apply Nutrifusion at a rate of 20g/m2.