Not only do green roofs look nice but they help heat the portable. As you see above, a green roof has 7 layers. The plant level, Media, a filter layer, the drainage layer, a protective layer , a barrier for the roots and the membrane for the roof. All these layers are important to house plants. It also helps heat the building because of all the layers and how it absorbs rain.
A greenhouse (also called a glasshouse, or, if with the right heating, a hothouse) is a structure with walls and roof made of transparent material, such as glass, in which plants are grown. These "houses" range in size from small sheds to industrial-sized buildings. A miniature greenhouse is known as a cold frame. The interior of a greenhouse exposed to sunlight becomes a lot warmer than the outside temperature, protecting its contents in cold weather.
On the outside and inside of our portable we used a fake wood called permanent wood. Permanent wood is not like other wood. (Pine,Birch etc.) It does not rot after a few years like some of the other wood does. And because it is fake wood it doesn't take out of the environment as much.