Comparative cradle to grave environmental life cycle assessment of traditional and extensive vegetative roofs: an application for the Lebanese context

Purpose Vegetative roofs (VRs) are fully planted roof spaces that offer aesthetic view, storm water management, sound insulation, energy savings, and air improvement. The aim on this work is to compare the life cycle environmental impacts of traditional gravel ballasted roof (TGBR) and extensive green roof (EGR) each having a surface area of 650 m2.