* - Big stones to help with drainage at the edge and stop plants growing into the building * - Top soil - gives a bit more substance to the compost ![]() * - 1 x Wood chips - More soil moisture goodness! * - 1 x Moisture blanket - this is to help keep moisture in the soil - i used blankets used in hanging baskets, but they cost a ton - you can also use cardboard or old blankets - however I was concerned these may rot * - 2 x Gravel - A layer to go on top of the pond liner, and another to go on top of the root membrane * - 1 x Root membrane - fancy name for the stuff you get in garden centres that stops weeds growing under decking/paths - This stops the roots and mud getting to the lower level of gravel, to help drainage * - 2 x Pond liner - this is to stop any of the roots, damp, greenery, water or any other stuff getting to the roof - I used 2 x liners to be extra safe * - 0 x Insulation - I had to put in some thermal insulation because our council building control couldn't calculate the U value for insulation of the living roof - after installing it this is way better than any fibreglass or fibrespan board - so you probably dont need this! * - 1 x Roof - it'd be a normal garden if it wasnt on the roof! * - Drainage so they dont get too wet (plants are tricky things to keep happy!)Īlso you need to protect the building structure, so this is my recipe for making a living roof: * - Some way of staying moist enough when it isn't raining (ideally we want this garden to be maintenance free) There are a number of types of living roof, ranging from the one I've made (enough for some simple grass, plants and anything else that comes along, right the way to full on living garden worlds, with trees, ponds and more - this isnt what we're after! thats the weight it'll be when there is just itself up there, a live weight is stuff like water (rain), snow or the bloke on a ladder trying to install a satellite dish. ![]() I found online is that living roofs can weight anything up to 150KG per SqM, so I asked our builder and engineer to work to a dead weight of 150KG - whats a 'dead weight' I hear you ask - well. After doing quite a bit of reading on the Internet, ok well an afternoon or so, I soon realised that there isn't a step by step instruction for building a roof garden, just lots of greenies saying how good they are, and lots of companies trying to sell you expensive stuff to do it - so i thought I'd give it a go myself.īefore putting anything on a roof you need to make sure its strong, very strong.Īs we'd just had this roof made we ensured we'd had is strengthened - there are 10 joists under the roof, each bolted next to another joist and supported by a steel frame at either end - so its super strong just to be sure.
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