Green roofs. green roofs can range from roof gardens with raised beds and pots, to rolled-out green carpets, to shed roofs containing planting cells that are filled with soil or compost and planted up with low growing perennials and grasses.. Even though it is just a shed, he has a full epdm membrane, a dimpled plastic drainage layer and another special filter cloth with integral drainage layer on top of that.. How to drain the roof. one of the main concerns that small scale builders have outlined to us is how to drain the roof. the guide gives rational to the whys and hows of allowing free drainage. before commercial drainage layers were developed, it was common practice to use a thin layer of gravel to act as a drainage layer..
Drainage layer for green roof by: paul hi john, my shed is nearly there and i'm now looking at the green roof installation. i have a waterproof layer, pond liner, and now want to install a drainage layer, but i am unsure what to use.. Sedum green roof supply a wide range of top quality sedum mats and modular diy trays for green roofs. telephone caroline on: 01747 830176 for information regarding green roofs. we can install or deliver all the components for a green roof or living roof including drainage layer and substrate anywhere in the uk.. For this shed i used nominally 'flat roof'. this was not flat at all, but had a fall of 75mm (3') over its length of 2.4m (8'). this gave a 1:40 slope, which was enough to encourage water to drain. the slope of a green shed roof needs to be a balance between being too steep or too shallow. a shallow roof pitch wont allow water to drain away..
