The walls are up, and it’s time to add the green roof to our straw bale classroom at Castle Hill School.
First the beams go on
Then we need to edge the roof
It will be a green roof – a living ‘lawn’ of sedum on top of the classroom, so a strong ‘fence’ around the edges is needed to prevent the ground from shifting when it rains. There is also a pathway of gravel around the lawn to provide structure and drainage:
Adding the sedum
For a project of this scale, it’s easier to buy sedum and soil in rolls, like this:
They can be easily unrolled onto the surface of the roof:
Once complete, the roof looks like a field – it’s hard to tell it apart from the landscape behind!