SolaGreen (like LiveRoof without SolaGreen) involves covering the waterproofing membrane with a protective layer first, then soil and plants. This shelters the membrane from the things that cause waterproofing membranes to wear and fatigue, temperature swings, UV radiation, drying winds, extreme cold and heat and mechanical damage. A well designed LiveRoof is expected to extend the membrane life by 200-300 %.
With this in mind, it is important to think long term and to cover all or nearly all of the rooftop membrane—so that it wears evenly and so that future generations are not saddled with the patchwork of replacing membrane sections that have worn at different rates. Because of this we encourage you to cover the rooftop, from parapet to parapet with LiveRoof.