Sloped Surface
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.
Enviromat Slabs
The Enviromat can be ordered in 1x1m square slabs (1m²), 1x2m square slabs (2m²).
Flat Surface
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.
Enviromat Slabs (With Drainage Mat)
The Enviromat can be ordered in 1x1m square slabs (1m²), 1x2m square slabs (2m²).