With over 50 thriving garden roofs installed, Combined Roofing Services has the experience advantage. We partner our rooftop skills with select manufacturers and landscapers to provide full system, single-source responsibility garden roof assembly. Green roofs can be installed on a wide range of buildings, from industrial facilities to private residences. There are two types of green roofs: extensive and intensive. Both types of green roofs consist of the same basic layering components with a number of barriers to prevent water or root damage to the structure, a drainage layer to aid in water drainage, as well as a growing medium and vegetative layer.