If we want to be eco-friendly, we can plant a garden on a roof. The photo below is a living wall of a residential home belonging to Paul and Cicek Bricault.
Some companies exist that provide do-it-yourself green roof kits. For larger scale residential projects it is best to hire a professional green roofer. There are many items that need to be taken into consideration when planning a green roof. Load bearing capacity, state of the existing shingles or membranes and micro climates to name just a few. Roof gardens on the tops of large urban buildings have been in existence for decades.