Would have given more stars but their customer service/information was not good. I phoned for information when prepping a summer house for a green roof for a client. I was told that the 'meadow roof' was fitted just like the sedum roof kits that I have used before. When I phoned again to order the meadow roof and pressed them for more info I was told that the meadow roof needed 100mm of topsoil substrate. This is completely different from the sedum which needs no extra substrate. The upshot of this was that my client had to have the sedum roof instead as it was too late to make allowance for the soil and I was left hundreds of pounds out of pocket. Customer service were not very helpful.