text: You would build a green roof the same way you build a orange, or purple roof.  However it is slightly different from a blue, red, or yellow roof.  \n\nIt depends on the square footage of the roof, the materials that you will use, and the restrictions for the open space under the roof to name a few.  If you have natural materials close to where the roof will be, then use them, like the trees, rocks, and vegetation.\n\nBut make sure that when you build it, OVER engineer it.  The weight from the roof, water, wind, and animals will add a force that needs to be addressed.