Just cut and trim the squares to your space and voila! Installed rooftop growing garden.
Because I was in a hurry to get planted, I used a company that sold squares of pre planted succulents that which would work for my climate.
After the layer of fabric, pour a layer of lava rock. After the lava rock a layer of mushroom mulch.
Prepping a rooftop garden. After the roof is sprayed with the black waterproof layers, lay down a shield like this to prevent plants from directly sitting on your roof. This also helps with drainage.